Also provided is a country that “artificial” ( “field” for American readers) that can be used to provide power center of the crossovers, and other accessories – like a parametric equalizer or even a simple graphic equalizer.

Circuit Detail

The input impedance is at least 15K (it is much more than that for most control settings), and the output impedance of 100 ohms – low enough to drive any line input.

The schematic for the preamp

The preamplifier circuit is quite conventional, and the need is AC coupled everywhere. The artificial soil is represented by two resistors (R1 and R2) is grounded “exactly 1 / 2 the supply voltage derivatives. This is theoretically 13.8 in all cars, since this is the correct charging voltage for a 12V battery.

To reduce the maximum profit, you simply reduce the values of R105 and R205. For example, the reduction will be the 4k7 to a maximum gain of 3 (10 dB), which in reality is probably sufficient.

Note 1 – There are a series of filters, because the vehicle is now well known, very strong. In some cases it may be necessary to replace R3 with a module adapted noise filter, inductor, or both.

The artificial soil was obtained before the “6V” administration, and is used instead of connecting the real world for additional circuits. It may (will) not be necessary in some cases …

Add input and output capacitors to the additional circuit
Reversing the polarity of the entry into force polarized output capacitors. The + ve lead of all electrolytic capacitors must be connected to the system with lead-ve as an entry, exit or chassis ground, if necessary.
In addition, electrolytic capacitors should be in feedback circuits that are connected with the earth, the real world are connected, not the artificial world, or performance may suffer.

For example, I provided for the circuit of the equalizer for my subwoofer and a parametric equalizer (Project 28), with necessary modifications indicated. The same principle applies to other networks or crossover signal processing circuit.

Flyback 10KV-30KV Circuit

The primary is a handwound coil wound on the opposite side of the secondary consisting of ten turns of 16 guage solid wire. The feedback winding is wound on top of the primary winding with four turns of 22 guage solid wire. Both windings are center tapped. If there is no high voltage from the secondary winding then try reversing the leads that go to the bases on the transistor. These must be in phase for proper operation. The 2N3055s can be replaced with about any large horizontal output transistor, in fact this is actually better. You can also use a PNP transistor, just reverse the polarity of the input.

The amplifier is very easy to get on the board, and an innovative tone defeat. Rather than disabling the sound system completely, they are massively de-sensitized, and defeated the  have a maximum range, . This can be increased if desired, so that you can have two settings of tone, a rising standard of 10 dB and a cut and the other with a very subtle 3dB boost and cut – that’s enough (surprisingly) a very minor adjustments to the way you need for day-to-day hearing.

Otherwise, the design is fairly conventional, with a great advantage over other models that require almost no cable. Transfer of the source is as you want – I suggest you bring a rotary switch on the rear of the enclosure, and a shaft extension with the tree in front. This leads to a minimum of wiring and reduces crosstalk from other active inputs.

Picture 1 - A and tone controls

Circuit Description

The input stage is shown with a gain of 2 times (6dB), configure and also acts as a buffer circuit for tone control. The tone control is a fundamental type Baxandall, but the addition of R117, 118 and 119 provide the flexibility and ease of reconfiguration, which is not the traditional arrangement.

Picture 2 - Balance, volume and output stages

R119 is the hard part of this circuit (which is unique, too

- I have not seen before, this technique is used). As it is 100k, which limits the range of tone control to a reasonable + /-10dB. To increase more and cutting, R119 (R219 and receive) can be omitted altogether. Conversely, reducing the value of a small area, will also, with about 6 dB at 20 Hz and 20 kHz to 7.5dB with 22K.

The sound system (and overall) performance is shown in Picture 2 (in increments of 10% of pot), and it appears that the midrange is hardly affected. This is in contrast with the majority of drawings in which the controls are aligned to 1 kHz, and it is a very audible in the media. For those who want absolutely no use of tone controls, I suggest that the  both without tone controls are designed and in line with true minimalist design.

battery charger circuit with IC regulator

The circuit is the elementary 6V 1A power supply circuit using IC regulator 7808. The 7808 three-terminal positive voltage regulator is available in the TO-220/D-PAK package build them useful in a wide range of applications.

The IC 7808  employs internal current limiting, thermal shut down and safe operating area protection, doing it essentially indestructible. If proper heat sinking is provided, it can deliver over 1 ampere output
current.

6 Channel Graphic Equalizer Circuit with TL074

The EQ circuit is very easy to build and has a good quality. You can do it with component stereos portable tape recorders, radio cassette recorders, radios, etc. ..
Operational amplifiers on one chip. 6-band equalizer for a channel can easily by externally connecting capacitors and resistors, which are formed for (resonance frequency) UPDATE. Series connection of two makes TL074 (6 to 10 bands) and multi-band. It is very stable in the capacitive load. Maximum voltage 20V max VCC must not be exceeded. The operating voltage is about 5 to 15V. Use of force with pin-room shorted, the causes are the destruction or damage to the IC. Use when mounting the IC on the board of directors or, make sure that the pin does not contain spaces Lot, shorted, etc.

Electronic Part

IC1-2=TL074
C1=1uF 100V
C2=15nF 100V
C3=150nF 100V
C4=33nF 100V
C5=8.2nF 100V
C6=1nF 100V
C7=470pF 100V
C8=680nF 100V
C9=680nF 100V
C10=150nF 100V
C11=39nF 100V
C12=8.2nF 100V
C13=2.2nF 100V
C14=470nF 100V
R1=47Kohms
R2-5-18=150Kohms
R3-4=10Kohms
R6….17=10Kohms
R19=100Kohms
RV1…..6=100Kohms Lin  .

Regarding the project is ten band graphic equalizer for one channel (mono) audio system. If you would like to Stereo EQ ,You need build 2 similiar circuits for 2 channel (stereo) audio system.

The audio equalizer build based on IC  TL074 with low noise JFET op-amp that will give you high quality audio output.

Electronic Part List

10 Channel Graphic Equalizer Circuit by TL074

All Resitors is 1/4W 1%
C1=47uF/25V
C10=27nF 100V
C11=12nF 100V
C12=6.8nF 100V
C13=3.3nF 100V
C14=68nF 100V
C15=33nF 100V
C16=18nF 100V
C17=8.2nF 100V
C18=3.9nF 100V
C19=2.2nF 100V  
C2=47pF
C21=560pF
C22=270pF
C23=150pF
C25=150pF
C26=10uF/25V
C3=150pF
C4=1.5uF 100V
C5=820nF 100V
C6=390nF 100V
C8=100nF 100V
C9=47nF 100V
IC1…3=TL074
J1…3=RCA Jack
R18….27=220Kohms
R2-5-31=1Mohms
R3=47Kohms
R4=15Kohms
R6-28=10Kohms
R7….17=1Kohms
RV1=250Kohms Lin.
RV2…..12=4.7Kohms Lin.
S1=2X2 SW

regulator 12V 3A circuit

The LM317 is to provide an adjustable, positive 3-Terminal Voltage Regulator 100mA (RA87U control) or 1.5 A (Order Code UF27E and N61CA) over a range of output voltage of 1.2V to 37V. These voltage regulators are exceptionally easy to use and requires only 2 reistors external output set. Both line and load regulation are better established than standard regulators. Protection against overload is fully furnished with on-chip current limiting, thermal protection and safe area. This will remain fully functional even if the adjustment terminal is disconnected, making it virtually blow-out. Order UF27E comes in a TO-220-bag style. Order RA87U comes in a TO-92-style bag. Order N61CA comes in a TO-263-bag style.

The Circuit is designed to produce an amplifier using a TDA7294 audio integrated circuit allocation schemes for 60 watts of power.
Terminology

* Amps – something like a built-in amplifier and is designed for the delivery and provision of adequate and high maximum output directly drives speakers or fees within a certain percentage of distortion
* TDA7294 – monolithic integrated circuit in 15-watt multi-packs separately for use as audio class AB amplifier in Hi-Fi field applications such as high-profile television, home stereo powered speakers designed for short and their short-circuit protection very low noise and distortion, thermal off, mute and standby functions, not on / off noise, high performance, not Boucherot cells DMOS output stage and high operating voltage range of
* Amplifiers Class AB – operates as a class-B amplifier that almost all of the crossover distortion by removing a small amount of bias current that constantly flows through the output transistors

Circuit Explanation

100W audio amplifier circuit

Using the integrated circuit TDA7294 is best suited to operate in Hi-Fi audio applications, amplifier class AB. Sovereignty is capable of delivering both 4 ohm and 8 ohm loads, since the IC output current and a wide range of voltage. In addition, 8 ohm load with 0.1% harmonic distortion (THD) can be supplied with 50 W RMS, with the addition of sufficient power and the minimum number of components. Eliminates the presence of heat sink water temperature at a rate of 1,4 ° C / W. In standby mode, is treated with PIN-9, while the MUTE input from the pin 10 is treated. In standby mode is always a priority for the MUTE input.

The amplifier will be activated immediately, while inclusion. This is certainly connected through lessons without constantly on the supply rail. The conversion of clicks is by increasing the time constants of C5 C6 and & R4 & R3 can be eliminated. Due to internal thermal protection of the IC, the temperature at 145 ° C can cause MUTE condition and at 150 ° C, the amplifier is in standby mode. The Circuit amplifier must not be made without the presence of a radiator that internally to generate a negative supply rail is connected to be operated. In IC, the radiator of the amplifier in a grounded metal enclosure to be mounted in isolation. The maximum voltage for 8 ohm load 40V to 30V for 4 ohm loads, a transformer with 80 VA and 150 VA for two modules in a stereo amplifier rated.

25W ClassA Audio Amplifier circuit

This circuit is a simple class A audio amplifiers. But with zero distortion, Q1 is a switch is in operation or shut down, so that no load current through the resistor R2. In the best case, the tension in Q1 and the load resistance equal to the Class A operation.

A 100K potentiometer (R3) and a 1-meg resistor (R1), and a simple tea-Variable Bias Circuit. Plase voltmeter between drain (D) of the 1 Quarter and the dissemination of soil and adjust R3 for a meter to half the supply voltage.
Applications IRF511 project much as it is pupola build the electronic circuit.
Nearly everyone will be resistance value for R2 used, as maximum power and the FET are not exceeded.
A resistor value of 22 to 100 Ohms is a good choice for experimentation. For high flows, adapted to be used on a radiator.

Description
   The amp is “El Cheapo 2-30, and was valued at a maximum of 30 watts per channel into 16 ohms. It uses a single power supply regulated power and a capacitor connected speakers. Having had the original, I can now reproduce the scanline detailed information. It was a very simple amplifier, used for almost complementary symmetry power amplifier. For those who are younger than me who had no idea what I am talking about quasi-complementary symmetry system used in time when the PNP power transistors were expensive and silicon devices have been pretty useless. If you want a kind of voltage and current rating, it was necessary to use NPN devices. The quasi-complementary output stage uses a (discrete) from Darlington to the positive side and a complementary pair to the negative (or a rider to a PNP-NPN power transistor coupled).

Meanwhile, in these days when you high gain and the current capacity adequate, germanium transistors would still ruled supreme. Provided they have been used in applications where the leak was not a big problem, germanium devices very well – it’s not entirely the amplifier output stages are, however. Even then, the majority of speakers were 16 ohms, with only a few dare to 8 ohms. All that was less than the almost unknown in 1964.

Figure 1 shows the circuit – it was an amp cheap compared to most offerings of the day. In addition, it was possible to sound respectable – built again in comparison – and me and my many friends from the date of this amplifier with a passion – guitar amps, Hi-Fi, you name it, El-Cheapo went !

Note that the types of transistors are referred to the original equipment. Most are now outdated, but it will be shown a list of skills below.

Those were the days when the transistor is the 2N3055 power of choice (NPN course), and there was no PNP devices remotely equivalent to less than 5 times the price, and even these were much lower. Consequently, almost complementary output very common, and even this is still the case with most IC power amps. The quasi-complementary output stage is the most popular until recently a fairly PNP power devices still available. Immediately, almost everyone started with Darlington NPN and PNP devices connected to the output stage (such as T3 and T4) – The funny thing is that it demonstrated back in the mid-1970 that the full connection Darlington sounds made (or at least measures ) worse than the quasi-complementary phases. Is not progress a wonderful thing?

The input stage of the El-Cheapo is not subject to phase problems of the long-tailed pair, because the class a driver (or SAV – Voltage Amplification stage) is used as the entry. Ampere led in this way often inherently stable. There is a big problem with DC offset of course – the item refers to the negative supply. If the earth (ground), it is no problem, but it precludes the use of this design with a dual supply. The DC is not a problem with capacitor connected speakers.

As shown, the gain for the audio frequency is 18 (25dB), a sensitivity of 1V for an input power of 40W means. The closed loop gain is set by R4 and R7. Since the score is taken after the output coupling cap, the latter does not affect the low frequency response – but this provision creates a network of underdamped filter that causes a 4.5dB peak at about 5 Hz. Increasing C7 4700UF eliminates this problem all respects.

In the original article, there were several variations of the design, but I do this amp based 40W form here. The variations were mainly based on lower voltages, but also a parallel (dual) output stage for the odd low impedance.

Note that the amplifier is great, and the input impedance of the amplifier itself is 1k (R4). For this reason there is an emitter follower (Q1) before the amplifier impedance to the right to convert into something useful. The described system has been far from ideal – a better solution would be to leave everything to the left of C2 and the drive circuit of a DAC (C2 should be reversed if the ADC supplies used alternately remove).

Regulated Power Supply

Power Supply Circuit For 25W hifi

The circuit is prepared as specified, and simple power amplifier with a low open-loop gain is a good idea to maintain a buzzing low. Using a regulated power Desirable Not usually but in this case is probably justified. Germanium transistors were used as shown in Figure 2 (all medium and high power transistors and germanium / PNP).

Because the amp PSRR (Power Supply Rejection Ratio will), only 36 dB, it will provide a noise problem with a non-regulated supply. It is noted Note that step emitter follower (Q1) contributed the bulk of the supply noise – LEAD good for the floor of the DAC amplifier.
The controller is easy, BUT would have worked well enough as indicated. 62V 1W zener Normally the unit, a power for the 60V amplifier gain (similar to the use of ± 30V with power over conventional split). Compared to today’s standards, hoods Probably the filter are too small (like Bouchon The loudspeaker coupling), but I’ll present it as it was originally described.

The TDA1010 is a monolithic integrated class-D audio amplifier circuit in a single pass 9-in-line (SIL) plastic.

 6 W audio power amplifier in car applications 10 W audio power amplifier in mains-fed applications.

The device is designed primarily as an amplifier to 6 W car radio to be used with 4 wall 2 impedances Wload. The wide voltage range power and flexibility of the IC is an attractive proposition for the turntables and tape recorders with output power up to 10 W.

6W audio amplifier cirucit

The wide voltage range makes this circuit ideal for applications in the area and the battery-FED devices such as televisions and turntables. The volume control stage has a DC logarithmic control characteristic with a reach of over 80 dB, control is by a variable DC voltage from 2 to 6.5 V.

Pre-Amp Tube Circuit

Preamp Part List
R1-7=1Mohm
R12-13=100ohm
C9=4.7uF 250V*
R2=100Kohm 1W
C1=220nF 250V*
U1=ECC82
R3-8=1Kohm 1W
C2=220pF ceramic or mylar U2=ECC81
R4=1.2Kohm 1W
C3=2.2uF 350V*
RV1=2X100Kohm log.
R5-11=5.6Kohm 2W
C4=1000uF 16V
RV2=2X100Kohm lin.
R6=100Kohm
C5-6=2X50uF 450V
RL1….6=Relay 12V 2X2 [1A] 
R9=22Kohm
C7=1uF 250V* 
R10=100Kohm
C8=220nF 630V *polypropylene or MKT

Power supply Circuit

Power suply
IC1-2=LM317*
R1=2.2Kohm 5W
R2-4=100Kohm 2W
R3=680ohm  5W
R5-6=220ohm
R7=470ohm  1W
C8-13=10uF 16V
C1=33nF 630V
C2…..5=2X50uF >350V
C6=4700uF 25V
C7-9=100nF 100V
IC3=7812  [1A]
C10-15-19-20=47uF 25V
T1=230Vac / 200V 0.15A
C16=470uF 25V
T2=230Vac / 12V 3A
C17-18=100nF 100V
F1=0.2A slow
BR1=4 X 1N5408
BR2=4 X 1N5408
BR3=4 X 1N4007
F2=0.1A fast
TR1-2=4.7Kohm trimmer
S1= Switch 2X2 10Aac
RL7=12Vdc Relay 2X2 10A
D1…..7=1N4007 EMI RF Filter 230Vac/6A
D8=12V 0.5W zener * with heatsink

Input Selector - Delay Drive Circuit

Input Selector – Delay Drive
R1…..5=1.2Kohm
R6-8=1Mohm
R7-9=10Kohm
R10-11=1.2Kohm
C1=100nF 100V
C2=10uF 25V
C3=22uF 25V
Q1-2=BD679
IC1=4081
D1……5=3mm Red
D6……9=1N4148
D10-11=3mm Green LED
LED S2=SEL 1X6 step
S3=1X2 mini switch

60w audio amplifier circuit vol2

If you want to build, you need to find a good project. As I said earlier, I built and I am very happy. The amplifier is of such a system driver booster high ideal bi-amp circuit with a simple single-supply. It is as if all amplifiers must be stable, but it means nothing to me, like many of my old drawings were unstable. This amplifier is by far the easiest and most stable I built.

To install it, set the maximum force 470K potentiometer. Measurement of the current amplifier and slowly adjust the resistance of the VR1,VR5 to read 1.65 to 1.7 was reached.

30w bipolar amplifier circuit

Although currently a small 30watt amplifier IC for an easy to use. And small, but for a sound developper predisposed than a transistor.
Today I bring all offers integrated audio power amp with 30watt output.

The 30W Amp Bipolar by TP9634 and TP2788 Transistor is easy to build and very inexpensive.
To power 24V> 2A.

Transistor :TP9634 and TP2788 be mounted on heatsink.
Can be directly connected with CD player, tuner and tape recorder.

25w amplifier circuit

Here is the circuit diagram of an amplifier of 25 W of power in 2009 TR. BC559 provides two channels of each rating, 12.5 watts into 4 ohms, both channels are load.Here bridge to a single channel out put weight will receive 25 W.

TR BC559 also has built in features such as short-circuit protection, thermal protection, overload protection, etc., with very low components.The external factors, the most interesting things I see on this chip is not necessary dual power.

 Notes

Do not connect more than 24 V BC559

 If 5 amperes bridge is not made available to one with four 5 A diodes.
Fit a suitable heat sink size BC559

If you operate the circuit without heat sink.
To connect the volume control in connection with a 10K pot
All capacitors are in this neighborhood has done more than 25 V.
Capacitors with a + sign must be maintained and electrolytic capacitors are usually positive.Other exception ceramic.If us that there is no data in the circuit or shares list.This law applies to all circuits on this site.

As you can see what metal a good selection of beat-frequency operation (BFO), up to 90 mm for a bottle-top. In fact, for the ultimate in simplicity, the capacitor C1 is omitted. In this way, the author reaches is astonishing, 150mm range for the bottle top. But with the frequency then to more than 4 MHz, the instability is a major problem.

Metal Detector Schematic

metal detector circuit

As shown in the circuit, oscillates at 230kHz. You can also experiment with the frequency by changing the value of C1. Faraday shield can be added to reduce ground-effect and capacitive coupling, and this is connected to 0V.
Since the inductance is resistance to rapid change in voltage, the charging of fees C1 delayed a bit like the logical level IC1a 2-pole change. This requires a rapid oscillations, which is repealed by an AM radio. Any change in the inductance in the search coil (by the presence of metal) to a change in the oscillator frequency. Although 230kHz is out of reach for the medium-wave band, an AM radio will significantly increase this frequency harmonics.

Metal detector calibration
This makes the search coil L1 is much room for error and is not far from conclusive. The author uses seventy turns 30 s.w.g. (0,315 mm) copper wire on a former 120mm diameter.
The metal detector, set up by the AM radio to pick up a whistle. Not all of these harmonic functions well, and are best suited to. The presence of metal will significantly change the sound of the whistle.

* Metal Detector FAQ *
This is not an industry or security metal detector and is not even near loma or ERIEZ metal detection system. It’s just a notebook, but not hand-metal detector.

18-36 power control

This power supply circuit is adjustable 18-36 volts and is currently shown as being limited to 2 amps, but up to 3 amps in a small current sense resistor of Options (0.3 ohm). 2N3055 and 2N3053 transistors should be in wells. very hot right now and resistance is to be made at 3 watts or more. Voltage, which is controlled by 1 / 2 of the LM1458 Op Amp, or 1458-AMP. It can be replaced in the circuit below, but sources indicate pressure. Pin 8 to 30 VDC supply is limited, which may increase by 6.2 Vdc or 5.1 Vdc. Zener K-series resistance, is 8-pin. Maximum supply voltage DC for LM1458 and LM1558 are 36 and 44, respectively.

    Should be the power transformer. As expected the power supply. Enter at least 4 times the desired output voltage, but can not exceed the op-amp under conditions of low stress. Transformer is used as a center, see 25.2 volts AC / AMP 2 units to regulate the 24 volts at 0.7 amps, 15 volts at 2 amps or 6 volts at 3 amps. Output AMP 3 is the center of the water. Transformer that changes the position of 18 volts. All components must be an exception from Radio Shack LM1458 op-amp.

10A power supply

If you don’t know ,”How to build regulator circuit ” for your project or equipment, I think this simply circuit will be to apply in your project .

I leads the old equipment to come and give a very generous and say I pray for DC power supply circuit 10A.

What a simple please, when I saw the equipment they already have. Then take this route, please use the 78xx chips such as IC 7805 =output 5 Vdc.

IC 7809 =output 9 Vdc.

IC 7810 =output 10Vdc.

IC 7812=output 12 Vdc.

Many have the number and strength M15004 number of transistors that can increase the flow. Obtaining high range 10A.The important aspect Transfermer that you need about the current 10A. And using C-format 10000UF with Filter.

water level sensor circuit

For circuit not only indicates the amount of water in the tank head, but also gives an alarm when the tank is full.
This circuit uses the widely available to show IC number CD4066 bilateral switch CMOS IC to the water level through LEDs.
If the water is empty the wires in the tank are open circuit and the 180K resistors pulls the switch to open the little switches and LEDs are off. When the water begins to fill the first wire connected to the reservoir in the S1 and the + supply are shorted by water. This closes the S1 and turns the LED1 ON. As the water further into the tank, LEDS2, 3 to 4 pm light gradually filled.
No. Levels of the display to 8 if 2 can CD4066 ICs are used to increase similarly.

If the water is full, the base of the transistor BC148 is pulled up with water and saturate the transistor, turning the buzzer ON. The SPST switch has to be opened to turn off the ringer.
Remember, the switch ON while pumping water otherwise the buzzer does not sound!

simple 12 to 9 volt dc-dc converter circuit

This circuit is a DC voltage output from a small DC input generate large voltage.It ’s easy and quick to do, and reducing the value of the Z-diode, the circuit can be universally adapted to other output devices of the circuit voltages. The give and all diagrams represent a DC converter with 12V battery 9 volt DC input and output.

With the 10V zener diode, as in the diagram, the output voltage is approximately 9.3 volts DC. The supply voltage is used, should always be at least a few volts higher than the Zener voltage. In this example, I have a 12 Volt DC battery to provide regulated 9-volt DC output.

Automatic Ni-Cd battery charger circuit

Although this circuit looks quite impressive, and perhaps a little “difficult, it is not difficult to understand. The circuit must be connected to a DC voltage between 16.5 and 17.5 volts max, otherwise the CMOS IC will be defective. Because I do not want to design a separate power supply for this circuit I connected my full Power Supply adjustable bench top.
   
   
   
First connect one “is cost-”-9-volt nickel-cadmium batteries for proper connections. Then connect it to power. At the 1nF capacitor starts the two RS flip-flop formed by IC1a, IC1b, IC1c, IC1d, and pulls pins 3 and 10 ‘high’ and pins 4 and 11 ‘low’. The clock pulses generated by the freewheeling MULTIVIBRATOR IC4. IC4 frequency determined by 10UF capacitors, resistors CAP 220K and 100K.

The clock runs continuesly, but behind the counter, IC5 not count yet because pin 11 (master reset) is kept high. When the button “START” button is pressed, output pin 4 from IC1a goes up and prejudices tr4 rendered visible by the red LED (D9), who is still on. The NiCad is now discharged via this transistor and the resistance of 100 ohms.
The CAP 10K (right graph) is adjusted so that when the battery voltage drops below 7 volts, the production of IC3 goes low and the output pin 11 of IC1a HIGH. HTE while output pin 10 of IC1d goes low and the red LED turns off.

100W MOSFET CIRCUIT

Circuit description: 
The 100-watt amplifier, basic research has been developed, which builds and (relatively) easily one a reasonable price. Has performed better (read: musical quality) than the standard STK module amplifiers are produced by using practicable and in any stereo receiver mass market today. When I built this thing, it was because I needed a 100 WPC amp and I wanted to spend the money. So I designed around all the parts I had in store.
The level design is more or less, and I’m sure there are no commercial units are similar. Knowlwdge For me, it is not an exact copy of the economic entity, nor I am aware that patents on Topology. For manufacturers to experience improved a lot and I know that improvements can be made but the idea was easy to hold and be able to do Anyone can do circuit of the United Nations and has the patience to do a sloppy job.
The input stage is a win is lf351 op amp, most of the open sky, as it stabilizes the dc voltage at rest. This then feeds a phase crossing, the swing voltage (-), Rail reference.

 The slope of the stage is an improvement Darlington High Linearity frerqency with. 2SC2344 the same collector has a large capacity Rather basic tension on. The MPSA42 demonstrate with a Low-Z and has a C (OB) PF few that is submerged by an effective CAP 33pF pole-splitting. And the stage) 2SA1011 the active load (current source, which provided an approximately 20 mA. The current scene is limited by a 2N3094 approximately 70 mA in worst case.
The result is a complete with outputs in Darlington complementary parallel. You could even though they cover, with one, if only 8 ohms easy to get to load the disk use is not recommended this. The use of machines in parallel increases the ability to drive reactive load (such as a significant current during the voltage waveform crosses zero and provides a high voltage and high curent through the transistor at a time) from L ‘ amp draw Can a High damping factor reduces and the maximum power transistor PROVIDE Peaks (remember, the profit on a drop of power transistors as the current increases).
       Compensation and poly case and a zero. The op-amp pole and the pole generated by the CAP 33pF, and the resistance of 470 ohms MPSA42 bias control. (the part of 33pF can benefit multiplied.) PF The capacitor 22 provides for compensation of lead and feedback will ADOTTAT from production tranconductance Rather than the production itself. It was in this way, the phase introduced by the output transistors, the feedback is not high frequency for the visa. This closed loop intorduces politicians, high-frequency limits. The two capacitors compensation must be type-1-creamic (NPO) mica or silver – with zero coefficients voltage signal.
          Amplifier Project was to be a 2-channel + / – 55 volt unregulated Run furniture, making up to + / – 48 volts at full load. It uses a 40-0-40 volt, 5 amp toroidal transformer, a rectifier bridge, 10,000 UF and filter covers per page. When using a standard EI transformer, a 6-amp rated units used. With this power, which produces 100 watts continuous, both channels driven into 8 ohms of resistance, without clipping. DB headroom and dynamic medium, and the United Nations. For more space, download voltages up to + / – 62 volt circuits may be used without modification.
Among other things, is the pattern in Postscript.
RESTRICTIONS:
           Without changes, the amplifier 4 ohm speaker systems are currently driving is no limit. The limit of a short circuit around a 4.5 A peak current, conventional speaker loads are discussed. (E ‘course at a higher peak current of the output swing approaches the rail.) If you perform either of these high-end speakers with the minimum means of impedance uncle, or that the stay is for REAGENT The range of most audio frequency (0.5 + J3.2 ohms) you might have a better amplifier than this. If the highest yield Motorola power transistors are used, the operation of a 2 ohm resistive load without any problems (), except for heat.
‘ve Never seen a slew-induced distortion on this amp with a CD of the band-limited (22 kHz) signal. I suppose fans of real high-end pieces can beat mixed with a TTL square wave signal with a pilot tone of a pick-19KHz stereo and Crank It Up will ensure that there is spectrum Spinges around, but who listens ?
Possible changes: (What power if I mo ‘?)
            The output transistors are Toshiba (Young 2SD424/2SB554) can not shoud USE superior supply voltages with a volt + / -60. If you intend to promote more use in parallel, or use the pairs 250 watt Motorola (MJ15024/MJ15025). A very low impedance should be increased, the slope of phase distortion in a drive with more than a basis for the release of Darlington Generating or add another gain stage current. Higher-beta (s faster) power transistors with reactive load is not worth a crap. Non-FT High When you replace sections is certified to have a fair distribution of the second chance.
              NE5532 op-amp can be used in input phase. If more than used the way for the + / -15 volt shunt regulator (symmetric ins UCCISE Bessel filter, etc.), the fall of 2.7K resistors Reduce might, for example, to maintain regulation 1.8K ohms. 2.7K resistors, but also can add up to 4 lf351 the type of op-amp regulator (Ho-hum balanced inputs 347 for a quad setup, in fine, DJ UN to prevent).
Recommendations of construction:
            The equalizer output and thermal transistor (2SC1567) to be mounted on a common heat sink – a unit measuring 5 centimeters high, with a rib 8 inches wide by 1.25 fins should do well for a channel. (You can see if pleasant) side of the case from them. Most applications do not require refrigeration normal than that. 2SC1567 And the reason for the Project for the bias regulator output was chosen because it is completely isolated – the version is more ECG mounting options. TO-3 outputs for the hardware is always convenient and easy to use.
The driver transistor amplifiers and voltage (2SC3344/2SA1011 couples) all require that, as a heat sink. Individual TO-220 heat sink is sufficient for the council – to dispel the tension of about 1.4 watt amplifiers. A common piece of 1 / 8 inch thick 1 cm x 4in. Aluminum angle will be long enough for all 4 on every channel, but be aware that they must be designed to take advantage of natural ventilation, must be and the transistor insualted.
Reasons attributable to keep separate from others, and a point. If this fails, the distortion high (5% or so), or are even vibration.
The bias output stage must be set to below about 25 milli ampere transistor output. This requires a value some time to stabilize, by You need more than an hour or so check during initial setup. Measure, measure the voltage across the emitter resistor and using Ohm’s law. This way you can participate in current output transistors in parallel at the same time to change and see if it was a serious discrepancy. Parties With the data of the same code, should not be turned off by more than 10%, after heated. Distortion power amplifier can amount used, but it takes more care to fix it. If you raise a quiescent current of more than 50 milli amperes per page, the value of the emitter resistors.
Initial Checkout:
Something just do not connect! Apparently a mistake, insignificant, can put your house on fire! (In addition to the blow out is worth 30 dollars in a microsecond transistors.) A variac will work in theory, but can the amplifier BOLT on the rail, if the offer is inadequate. I suggest using an Ballast Resistance – a 60-100-watt bulb in series with the AC power cord. Otti is a bright flash when you tap the application, it must be (almost) as the supply load current to reach its nominal value down. Amplifier and then typically work at low volume. If the amp draws too much power for any reason, the bulb shines, increase the resistance, and to limit the power to the circuit. In general, it is either a mis-wire (using DMM) Oscillation O (pointing to an area or RF power) of the metro. When the lamp is dim-dim-Bright-Light … And then the amplifier and marginally stable layout grounding should be reviewed. The values of the capacitors of adequate compensation should be, if they are not significant changes in the state. Mine is stable, as it is.
Further information:
The circuit is in PostScript, it should be printed Situation In soloist. Emitters of the transistors are designated by an “E”. I was too lazy by arrows on the symbols of transistors – and I use it in this way more than a year.
Find a particular problem? MCM (1-800-543-4330) has all the transistors. The total cost for a stereo version is to be between $ 150 S $ 250, a second type of operations of the case it could to find the transformer, and the heat sink. If you pay for ‘list’ of all to have, probably cost about $ 1,000 to build.
The information will HERIN is no guarantee, no warranty expressed or implied. Do not stand aside for the accuracy of the data is the author of technical information or the use of such false or assumed.
The equipment described in this article was designed, built and tested on my personal time with my personal resources.

electric power controller circuit

The equipment which can be controlled The equipment which works by the resistance. Such as the the tungsten-filament lamp, the soldering iron and so on. The equipment which is using the AC series motor(with the brush). Such as the drill, the electric fan, the cleaner and so on. The equipment which can not do the control The fluorescence light. The synchronous motor(using the capacitor) As for the synchronous motor, the number of rotations is decided by the frequency of the alternating current. So, basically, it isn’t possible to control with the circuit this time. However, the torque(power to turn) of the motor declines when the electric current which flows through the synchronous motor decreases. With it, the revolution can be slowed down. In this case, with the load which is applied to the axis of the motor, the number of rotations isn’t constant. The electric power which can be controlled is decided by the permission value of the electric current which can pour into the TRIAC. I used the TRIAC which can apply the 12-A electric current to the circuit this time. In the calculation, in case of AC 100V, a maximum of 1200 W can be controlled but in the actual use, about 700 W or 800 W are safe.

headphone amp circuit

This circuit is primarily to provide common home stereo amplifiers with a microphone. The battery power is a good compromise is free in this manner the input circuit by the low hum pick area and connection to the amplifier is easier because of the lack of power cord and of diet.
Must be doubled with a stereo microphone the circuit. In this case, two separate level controls are better than one dual potentiometer stereo combined.
Low current drawing (about 2mA) ensures a battery.Circuit operation:
The circuit is based on a low noise, high gain two PNP and NPN transistor amplifier with negative feedback, stabilized by R6, working conditions very carefully.

The level is attenuated by P1, but at the same time, the stage victory lowered because of the increased value of R5. This unusual connection of P1, helps to achieve a high degree of input, so) to meet a wide range of input sources (0.2 to 200mV RMS for 1V RMS output.Notes:
THD is about 0.1% @ 1V RMS (all frequencies).
Maximum voltage input (cursor control level at a maximum) = 25 mV RMS
Maximum input voltage (level control cursor position in the center) = 200 mV RMS
Place the circuit in a metal case is highly recommended.
Simply the result of this device to the AUX input of the amplifier with shielded cables and connectors appropriate.

6V to 12V Converter Circuit

Electronic Part List

R1, R4 2 .2 K 1/4W Resistor
R2, R3 47K 1/4W Resistor
R5 1K 1/4W Resistor
R6 15K 1/4W Resistor
R7 33K 1/4W Resistor
R8 10K 1/4W Resistor
C1, C2 0.1uF Ceramic Disc Capacitor
C3 470uF 25V electrolytic capacitor
1N914 diode D1
D2 Diode 1N4004
D3 12V 400mW Zener Diode
Q1, Q2, Q4 BC547 NPN transistor
BD679 NPN transistor Q3
L1 See Notes
Notes
1. L1 is a custom inductor wound with about 80 turns 0.5 mm magnet wire a ring around the core with an outer diameter of 40 mm.

2. Different values of D3 can be used to obtain different output voltages from 0.6V to 30V is about. Note that at higher voltages, the circuit could perform just as well and can not produce much electricity. You may need to use a larger C3 for higher voltages and / or higher currents.

3. You can use a larger value for C3, in order to achieve a better filtering.

4. The circuit requires about 2A from the 6V supply to provide the full 800mA at 12V.

The following shows the basic measurement results …

60W audio power amplifier circuit

Reduced the value of the Class A-based resistance to 560 ohms **
Increased the value of the bootstrap capacitor 100uF
Decreased Stabilization 100pF caps on (she was formerly 220pF)
Added the output inductance and damping resistance (see News)
** It is conceivable that with a few transistors, the value of 560 ohms is not correct. If this is detected, you should “optimize” this resistance to at least maintain DC offset. If you really wanted, you could even with a 2k trimpot (), and set it for at least DC offset. It is best to wait until the first temperature stable, but it will not change much anyway.

Apart from these changes, the amplifier is loaded with highly original and provide a + /-35V (voltage), as indicated at 70W into 8 ohms give completely satisfied. In his life, many of the above mods have done, because I never had the schedule when I needed him to find, as often as it went, like me! It is an evidence of the fair amplifier that can handle all types of resistor and capacitor replacements are made, and it still works well.

The noise and distortion figures are a bit pessimistic – there is so little distortion at 1V (20V or for that matter) that my major problems for the disruption, has a readable measurement. The oscilloscope output shows that most of what I see is noise – the integration of the production (my scope is that it is not) to eliminate the noise shows very little at all.

Circuit was designed to create a detection system with reference to the source of light energy.

Terminology

* Photo detector – a device that senses and detects the light and radiant energy,

BP103 Phototransistor Siemens

which uses the principle of photoconductivity, where the material with the characteristic changes of their electrical conductivity when exposed to light
* CA3130E – BiMOS operational amplifier that combines the advantages of two bipolar transistors and CMOS, which can be used in sensor photodiode amplifier peak detector, single-supply rectifier full-wave voltage regulators and precision supporters comparators high input impedance amplifier and broadband meters Long term, rapid sample hold amplifier, amplifiers, refers only reason Offers
* 74HCT13 – High Speed Silicon gate CMOS device that is pin compatible with low power Schottky TTL, includes four 2-input gates which accept standard input signals and are capable of transforming slowly changing input signals into sharply defined vibration output signals, without
* BP103 – Silicon NPN phototransistor circuits used to control and training, industrial electronics, forks, and controlled by a computer flashes with its features such as high linearity, suitable for applications from 420N to 1130nm and packaged into the motherboard 18-lens transparent epoxy resin in combination with Database

Circuit Description

photo detector circuit with 74HCT13

During the operation, the circuit is producing low power, which is enough light detector receives light. Even in the darkness, the light source can also be made from a variety of ways. Compatibility between the output of a TTL level logic produces a low level. This occurs because the light is detected by phototransistor Q1 BP103. This model of the transistor is manufactured by Siemens. Phototransistor has a photodiode with internal gain and nothing more than a bipolar transistor in a transparent case so that the base-collector junction can be achieved by light. Photons base-collector junction produce electrons can be injected into the base. The current gain transistor amplifies the photodiode current.

Assembled PCB Exemple

The sensitivity of the circuit is regulated by 10K ohm adjustable resistor RV1. Circuit is 5 V power supply that can be drawn from batteries or external power source.

The time sequence is generated using the CMOS 4017 decade counter and timer 555th Counter outputs 1 to 4 ares wire ORed with 4 LEDs, so the Red (- north / south) and (Green – East / West) LEDs will for the first four counts.

The fifth count (pin 10) illuminates (Yellow – East / West) and (Red – North / South).

Counts from 6 to 9 ares also wire or diodes control (Red – East / West) and (Green – North / South). Count 10 (pin 11) controls (Red – East / West) and (Yellow – North / South).

Deadline for red and green lights will be 4 times longer than the yellow and time to complete the cycle can be adjusted with the 47K resistor. 1N914 diodes eight could be subsituted with a dual 4 input or gate (CD4072).

LED traffic control circuit

Electrinic Part List

LM555              IC                  1pc.
CD4017             IC                 1pc.
2N3904             Transistor         4 pc
10K Ohms         Resistor          1pc.
47K Ohms          Resistor          1pc.
180 Ohms          Resistor          2pc.
Red                      LED               1pc.
Yellow              LED               1pc.
Green               LED               1pc.
1N914               Diode             8pc.
10uF/16V          Capacitor        1pc.
9V battery clips  Connector      1pc. (option)
PCB                                      1pc.

RLX resistor determines the brightness of the LED and current limiting for about 10 to 15mA when running between 9V to 12 VDC.
TRAFFIC flash scrolling speed is determined by the capacitors C1 and resistance R1 – C1 increases and reductions in R1, the slow speed.
For example, if the LM555 is set to generate one pulse per second, 1 Hz, the green light for 4 seconds to 1 yellow, red for 5

Xenon Strobe CIRCUIT 1

The circuit used to come in kit form with a surplus supplier, but it is probably more available. It shows some new concepts such as using a 555 as a pulse width modulator (PWM), and serial / parallel processors flash camera.
The 555 is mounted as a pulse width modulator (from the (low) time to be determined by the regulator). The output on pin 3 is connected to the gate of P-channel MOSFET (IRF9Z20) through the 100R resistor to prevent parasitic oscillation of the transistor. A low signal on pin 3 causes the MOSFET to turn, so the button controls the flash output and a bit rate, by varying the duty cycle of 555 and in turn the MOSFET.

Xenon Strobe CIRCUIT 2

With the main power IC TDA1554 Powered, operates this route to 22W. A few external components that support for the main component. Heat sink on the power IC is a must.

Components:

R1__________39K 1 / 4 watt resistor
C1, C2_______10uf 25V electrolytic capacitor
C3__________100uf 25V electrolytic capacitor
C4__________47uf 25V electrolytic capacitor
C5__________0.1uf 25V ceramic capacitor

22w_amp_TDA1554_Circuit

C6__________2200uf 25V electrolytic capacitor
U1__________TDA1554 Two Channel Audio Amp Chip
MISC________Heatsink For U1, Binding Posts (For Output), RCA jacks will (for input) This works best with 4 ohm speakers, 8 ohm operation, but do. This circuit has gone about 28 watts of heat, so that’s a good heatsink is required. The chip should run cool enough to touch the heatsink correctly installed.
Operated at 12 volts and about 5 amps at full volume. Small amounts consume less power and thus produce less heat. PCB is preferred, but universal solder or perf board will do. Keep lead length short.

22W Audio Amplifier PCB

tube preamplifier circuit

Preamp:Electronic Part List

R1-7=1Mohm
R2=100Kohm 1W
R4=1.2Kohm 1W
R3-8=1Kohm 1W
R5-11=5.6Kohm 2W
R6=100Kohm
R9=22Kohm
R10=100Kohm
R12-13=100ohm
RV1=2X100Kohm log.
RV2=2X100Kohm lin.
C9=4.7uF 250V*
C1=220nF 250V* U1=ECC82
C2=220pF ceramic or mylar
U2=ECC81
C3=2.2uF 350V*
C4=1000uF 16V
C5-6=2X50uF 450V
RL1….6=Relay 12V 2X2 [1A]
C7=1uF 250V*
C8=220nF 630V *polypropylene or MKT

Power supply cicruit for tube amp

Power suply :Electronic Part List

R1=2.2Kohm 5W
R2-4=100Kohm 2W
R3=680ohm  5W
R5-6=220ohm
R7=470ohm  1W
BR1=4 X 1N5408
BR2=4 X 1N5408
BR3=4 X 1N4007
RL7=12Vdc Relay 2X2 10A
TR1-2=4.7Kohm trimmer
IC1-2=LM317*
IC3=7812  [1A]
C1=33nF 630V
C2…..5=2X50uF >350V
C6=4700uF 25V D8=12V 0.5W zener * with heatsink
C7-9=100nF 100V
C8-13=10uF 16V
C10-15-19-20=47uF 25V
C16=470uF 25V
C17-18=100nF 100V
D1…..7=1N4007 EMI RF Filter 230Vac/6A
T1=230Vac / 200V 0.15A
T2=230Vac / 12V 3A
F1=0.2A slow
F2=0.1A fast
S1= Switch 2X2 10Aac

Input Selector - Delay Drive Circuit

Input Selector – Delay Drive : Electronic Part List

R1…..5=1.2Kohm
R6-8=1Mohm
R7-9=10Kohm
R10-11=1.2Kohm
C1=100nF 100V
C2=10uF 25V
C3=22uF 25V
IC1=4081
Q1-2=BD679
D1……5=3mm Red LED S2=SEL 1X6 step
D6……9=1N4148 S3=1X2 mini switch
D10-11=3mm Green LED

120 W audio power amplifier

This is Super Bridge 120W Power Amplifier by IC BDX67B for you as the amplifier circuit using the integrated circuit. Can not be circumvented, because this circuit wattage 120W delivers approximately 2 ohms.

View circuit and PCB where the circuit will think an important equipment used to be.

Must use the power that fits around the +40 V and-40V when the current 4Amp.

Besides the need for a heat sink with a format suitable IC BDX67B and Q1-Q4 BC556A, BC548 to the track all to see. Build easy penalty not paint anything. Ask a fun friend Power Amp Super Bridge 120W by BDX65B you sir.

230 W MOSFET Audio Amplifer Circuit

Here is simple LED-power audio amplifier circuit with MOSFET amplifier TL071C and 2 may be up to 45 W into 8 ohms.

For MOSFET IRFP240 and IRFP9240 are used safety with device can now be these modification.

The scheme is at the request SILICONIX and the voltage change of 2 serial resistances from suppliers operating voltage amplifier driver was inserted.

MOSFET must be mounted on at least one condenser 1K / W.

Amplifier efficiency is 70%, the reduction in the frequency distortion in more than 0.2% at 20 Hz at 8 ohms and 10W.

With a supply voltage in the range of + – 30V, can supply audio amplifier MOSFET 45W into 8 ohms and 70W into 4 ohms.

Remember that the sound amplifier is short, so all you can check the radio button is protected, whether the speaker is connected.

Electronic project contains the essential elements for building a HiFi Amp module using the LM1875 chip.

This project contains the essential elements needed to build an amplifier module for high fidelity with the National Semiconductor LM1875 IC. With the addition of a handful of parts and an adequate supply, this module provides 25W RMS into 8 ohms @ 1% THD.

PCB dimensions are a tiny 53 x 50mm (2.1 “x 2″). Heatsink, power transformer, speaker and cables are not included. (CPS50)
 

This project contains the essential elements needed to build an amplifier module for high fidelity with the National Semiconductor LM1875 IC. With the addition of a handful of parts and an adequate supply, this module provides 25W RMS into 8 ohms @ 1% THD.

25 Watt HiFi audio Amplifier Circuit

The project is built on a single side PCB. Protel Schematic & Autotrax were used in conception.

25 Watt LM1875 Implementation of components containing PCBs
Data to be provided to you:

Heat sink with a thermal resistance of 1.4 C / W or higher. Use the washing of silicon impregnated in the event of attack on the chip.
Speaker 8 ohm adequate power
Suitable cables.
Solder the power cables and audio directly on the pad provided on the PCB.

25Watt Hifi Amplifier PCB

The chip can be used with two agreements that provide single and dual power. We decided to use the dual fuel version. Version only offering that require the use of electrolytic capacitors 63V, thus increasing the cost and overall size of the module.

The input signal is coupled with R1 and C1 for the non-inverting input (pin 1) of the integrated circuit. Closed-loop gain of the amplifier is set at 19 by resistors (180K) and (10K). and C (22uF) in 3dB frequency point 7Hz.

The output appears on pin 4 of IC and drives a speaker directly. Speakers can produce long enough capacity to drive the amplifiers in the VHF oscillation. Resistance R6 (1W) and capacitor C4 (0.22UF) to help prevent this. They are linked through the production and the form of a Zobel network, which provides high frequency stability when driving capacitive loads.

The power supply integrated circuit is connected via 2A fuse for protection against external shorts to ground. Provide additional decoupling capacitors Supply Board.

The module is powered by a dual + / – 25V supply. These guides are provided by a separate power supply board. Consists of four diodes (1N5401) connected as a rectifier bridge and four electrolytic capacitors (2200uF) to soften wrinkles.

The power transformer used to power the module should be assessed at 60VA with a center-operated 35V secondary winding. A 30V transformer secondary winding can also be used, but the lower output DC would lead to reduced power.

If you want to run two modules in a stereo amplifier, you can use a common food. In this case, the RANSFORMER should be valued at 80VA.

Test

Before the switch, verify that all parts are inserted in the correct positions. Make sure that the electrolytic capacitors are in the right direction. Connect the power leads with a multimeter (set to read amps) in series with the positive rail. Do not connect a speaker or an audio input yet.

Turn on and check the current stabilizes at 50-70mA. There will be a brief charges that Suge main filter capacitor. You must have installed the radiator, otherwise the overload protection circuit to reduce the heat in and out.

If the quiescent current is correct, check the DC offset voltage at the terminals of the speakers. It must be less than + / – 50mV. If all goes well, switch off the device and connect a speaker and an audio signal input.

18Watt amplifier circuit

TDA2003 is a BCL (bridge amplifier is used) and deliver a car to 18W.
TDA-series integrated circuits are well apreciated and used in the amplifier designs and projects. TDA audio amplifier circuits are usually manufactured in Philips and SGS-Thomson.
The most commonly used IC TDA2030 is a small audio amplifier TDA7294 sets and for higher power amplifiers.
In this article we present some representative diagrams of the amplifier circuit TDA: car and home audio amplifier with notes under each diagram.
TDA2003 is a cheap amplifier that is intended to be on a single rail power supply (running unipolar). Provides high output currents (up to 3.5 A), very low harmonic and crossover distortion.

18W Amplifier PCB with TDA2003

The performance is dependent on supply voltage and load resistance. More than 10 watts for 2 ohm speakers with a typical 16V supply, 9V power supply with 8 ohm speakers can be about 1W. Volume potentiometer and coolers provided.

bass booster circuit

Bass Boost is now in good health … If you’re driving, gut-vibrating pulse of disco, or a continuous line of soft rock bottom, hard, or relaxed. One way to get the bass boost its modern without running to buy a piece of expensive capital works is to use a Bass Booster between your guitar, electric organ or what-have-you, and instrument amplifier. A reminder of striped bass from the signal output level of the instrument and amplifies low frequencies, eating everything on earth “to the amplifier sound of the instrument. Of course, over the loudspeaker used with the amplifier, the lower the more powerful: use 15-Inchers Booster with low and you can shake the windows. Bass Booster is battery powered by a standard 9-volt transistor radio. Can be mounted on a small card printed or a VEROBOARD using point wiring point. The call connects between your instrument and amplifier through two standard RCA jacks.

Bass booster implementation

Connect your guitar or other electronic instruments, electronic input connector J1, J2 Connect the output jack for recording your instrument amplifier is commonly used. With the switch S1 off, S2 button when the device is fed directly into the instrument amplifier. P2-cons with a multi-clockwise (off), place switch S1, S2 buttons and P2 lead to the desired level of bass. To reduce back to his natural right Stomp Down to S2 and the key to Bass Booster Out. Do not worry about leaving the switch S1 for a few hours concert. Circuit draws less than 1 mA from the battery so the battery will last for many months.

12Vdc to 9,7.5,6 Vdc circuit

This simple converter using a Zener diode and a transistor into a 9V DC 12V DC battery power to the maximum 1A. The circuit is very simple to build, and requires only 3 electronic components, resistors, zener diodes and transistors. The 2N3055 transistors, 1N4738A Zener diode or Zener voltage and the same power. 3W, and possibly wire wound resistor 3R type. Powering a useful tool to use 9V DC.

The output voltage of the following formula:
Zener voltage Vout = + 0.65V, 0.65V, which is the base-emitter voltage of transistor

light adjustable circuit with IC 4017

The IC-556 works as a pulse generator and feeds the clock pulses to IC 4017th IC 4017 is the heart of this circuit.

 It works like a switch and gives the output after every 10 pulses. It pushes the transistor, which in turn fire the triacs. The triac provides sufficient current to the load.

I see in the data sheets that the OPA541 can deliever 5A continuous and +-40V on the supply side.

subwoofer circuit

The OPA549 can deliever 8A, but can only handle +-30V on the supply side.

Here you can opa541bm, simply use a link from the period after the defeat on each chip back 1 / 8 pins on the opa541bm. Will give you 200 watts at 4 ohms
How do I calculate how many watts to deliever at 2ohm, 4 ohm or 8 ohm? V ^ 2 / R = W, but how can I find out how many volts can deliever. You can not deliever as much as the supply, or am I wrong?
Data opa541 “Voltage Swing = Vs-5, 5 @ IA = 5A”

Power @ 4 / 2 are generally of the P = ((I * root2) ^ 2) * R = R. limited 8/4/2 ..

Ipeak = V / R. Irms = Ipeak * root2. use for people with reduced mobility and Irms Vrms.
The first operational amplifier and was impressed with the results. I, however, that a simple circuit, the amplifier was very good. I do not have a detailed opinion on the quality of sound, as I am not an audiophile. If you are looking for a simple amplifier to the first draft, I suggest a “clone of gain.”

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I decided then to a more powerful amplifier with a copy of the operational amplifier OPA541 High Power’m as free samples. I was impressed with the results of this amplifier as well, using, given the poor quality of components I. An image of this amplifier is below.

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Both power amps have been mentioned by my bench power supply for testing positive with a positive bid for the railroad, providing 0v, and the positive power supply and one for the land, 0V and the second negative power supply rail. That led me to + / – 0-30V supply to an amplifier, easily enough for testing purposes.

I then two 15V 5A gives, and uses as above. I’m still in the construction phase power supply for my past. This is a wide range of + /-40V. This offer will be able to provide me with sufficient power amplifier.

It is in the testing phase, I rail UF 4700, found around these capacitors effect at the time of the construction industry. Shortly after the discovery provides two 15v, I found four capacitors 33,000 UF and now I am with two by rail, amounting to 66,000 UF rail. This amount of capacity, in my opinion are much more serious. This is because it consumes more bass, treble, and large capacitor banks to help the capacitors, the required power.

2W switch power supply circuit

It is to compensate the reduction of output power due to low voltage supply the transistor uses the Bridge-Tied-Load principle (BTL) which can provide an output of around 1.5 to 2 W at 14Vdc with a power supply of 6 V.

For the circuit the potentiometer can be used to control the voltage. Capacitor C1 and C2 are meant for filtering the supply voltage if a battery eliminator is used as supply source. For operations using a battery C1 and C2 are no necessary.

The work of the power supply is the gain of 2N3053 2N3906 and 2N3904 is fixed internally at 2Watts.
It is to compensate the reduction of output power due to low voltage supply the transistor uses the Bridge-Tied-Load principle (BTL) which can provide an output of around 1.5 to 2 W at 14Vdc with a power supply of 6 V.

For the circuit the potentiometer can be used to control the voltage. Capacitor C1 and C2 are meant for filtering the supply voltage if a battery eliminator is used as supply source. For operations using a battery C1 and C2 are no necessary.

Figure 1 gives a stripboard layout for the 6V regulated power supply shown in figure 1.
The layout does not include the transformer block, so the input to the board needs to be 6V AC from a suitable transformer. 
The layout includes space for two optional 2-way screw terminal blocks to make connecting up the power supply easier.

If the input voltage is 6V AC, you will be able to draw 1A from the power supply.  For the maximum input voltage of 14V you will be able to draw 2W.

The project has a normal gain entry to the regular “Fender-like set of” full-range control, treble, bass, midrange and volume.

It is also possible for extra high gain jack, the second phase of the tunnel and its own gain control. This gives you, the predecessor of classical singing boogie Quickly.

New design dual-Stage Master is another control, with 3 watts can a child all the way back and still be able to talk about it! 

3Watt Tube Amp circuit

Electronic components

5W Tube Power Amplifier with EL84

And each of you probably know, I’m not a fan of tubes parallel to all.I would be very interested to know the success of an amplifier EL84 September

I thought everyone should know that I did for the beginning of the plan at first this thread and its good work. Most of all values for ressistors and caps I used are fairly similar, if not the same as what is in the map. Although I used a plug in multiple sets of filterstage before taking the state wave diode rectifier sound. In the first test no sound, so I cliped feedback negative lead goes to ground and it worked and I cliped feedback and lead others there was no difference in sound if c is finished. Its units strong enough and a lot of 12 “speaker very clearly.

Here are the results of the test:

B 1 = 331VDC, 262VDC B = 2, B 3 = 235VDC

EL84 = PIN9 = 261V, 311VDC bias pin7 = = 47th, PIN3 = 6VDC

The amplifier has been from 1954 to 1989, when it came out, except that the operation, the average activity for 15 hours a day. It is not present in damages in excess, in particular the replacement of the tubes, capacitors and resistors, caused by natural wear. The fundamental change came with the replacement of a provision of the tube, to restore diodes. There is only one problem, they try to produce the transformer cost, (it is valid for all pipe manufactured), one of the code is there and it will help. It may cost to replace traditional transformer suitable for EL34. Its products they need (it is the force responsible for all districts), sufficient experience and attention to the high voltage electric shock.

35w tube amplifier

 Electronic Parts

R1=470K 0,5W
R13-21=820K 0.5W
R12-23= 180K 0.5W 
R2-5= 2K2 0.5W
R14-22=5K6  0.5W
R3=150K 0.5W
R15-20= 680K 0.5W
R4= 220K 0.5W
R16-19=100K 0.5W
R6-10= 56K 0.5W
R17-18=3K3 1W
R7=3.9K 0.5W
R24=470R  2W
R8= 220R  0.5W
R9= 1M  0.5W
R11= 39K 1W

C2=220pF 600v
C8-9=0.1uF 630V
C10-14=0.47uF 630V
C4-5=16uF 550V
C11-13=25uF 40V
C1-3-6-7=0.1uf 630V

V1=E80CC 
V2=E80CC 
V3-4=EL34

TR1-2=470R  1W Variable (adj. 270?) Rectifier
tube= Z2C

T1=Audio Transformer for 2x EL34 Push Pull

50 Watt apmplifier with TDA1514A

Here is circuit audio amplifiers for car, which use it only number Transistor Circuit of IC, simple Circuit (and Top Popula)
Use TDA1514A transistor at low cost. It best Idea Circuit.

LM317 Variable Power Supply Regulator

A circuit is timeless. LM317 regulator is a versatile and highly efficient 1.2-37V voltage can provide up to 1.5 Amps. of current with a large heat sink.

audio amplifer 120watt circuit

Here is a simple and easy to build general purpose 120 W. Amplifer with IC number TDA7293 for process sound system.
This amplifer was have the input for a radio, TV, stereo or other line level device.
It also has a phono input for a record player, guitar, microphone or other un-amplified source.
With the addition of a low pass filter at the input, it makes a great amp for a small subwoofer.

Parts

R :  660 Ohm 1/4 W Resistor = 2 pcs.
R : 22K 1/4 W Resistor  = 5 pcs.
R : 10K 1/4 W Resistor = 1 pcs.
R : 30K 1/4 W Resistor = 1 pcs.
C : 2200uF 35V Electrolytic Capacitor = 2 pcs.
C : 0.22uF Capacitor   = 2 pcs.
C : 22uF Capacitor =  4 pcs.
C : 0.45uF Capacitor = 2 pcs.
U1,2 :  TDA7294 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

T1 :  50V Center Tapped 5 Amp Transformer
S1 : SPST 3 Amp Switch
S2 : DPDT Switch
F1 : 2 Amp Fuse
SPKR1 :  8 Ohm 120W Speaker
MISC : Case, Knobs, Line Cord, Binding Posts Or Phono Plugs (For Input And Output), Heatsinks For Q1 And Q2