By the question from a reader-driven, it is a sensible addition to a vehicle audio system, especially if you will, a crossover and other low-level amplifiers used. The circuit includes two audio preamplifier, with a maximum gain of 21dB (which can be reduced, because it may be too high) for many applications.
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. Continued…
Posted in audio amplifier.
Tagged with Artificial Earth, car amp, car amp schematic wiring, Car Preamplifier, preamplifier circuit diagram.
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.
Posted in Power supply.
Tagged with 2N3055s, flyback driver circuit, flyback oscillator, flyback projects, flyback transformers.
For a complete HI-FI amplifier (with EQ and) with the possibility of PCB mount pots is something 
I have avoided, as are the pots that are available in different parts of the world, necessarily compatible. Due to popular demand, this project has been developed (with a complete PCB) to fill the gap in the creation of the PTA to provide.
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. Continued…
Posted in Amplifier, audio amplifier.
Tagged with Hi-Fi Audio Preamplifier, Hi-Fi Preamplifier, Hi-Fi Preamplifier circuit, TL072 opamp, TL072 opamps.
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.
Posted in Battery Charger.
Tagged with battery charger chip, battery charger diodes, electronic circuits battery charger, high voltage battery charger, hobby battery charger, inverter battery charger, lead acid battery charger circuit, scr battery charger.
The audio circuit high quality complete low-noise 6-band graphic equalizer circuit is based on monolithic integrated circuit manufactured by linear TL074 .
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. Continued…
Posted in Sound Circuit, audio amplifier.
Tagged with 6 ch EQ circuit, 6 Channel Graphic Equalizer, EQ Circuit, EQ LT074.
Circuit Detail
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 Continued…
Posted in Sound Circuit.
Tagged with 10 Channel Graphic Equalizer Circuit, Audio Equalizer Circuit, graphic equalizer circuit, graphic equalizer frequencies, graphic equalizer spectrum analyzer, IC TL074, stereo graphic equalizer.
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.
Posted in Switching regulator circuit.
Tagged with 12Vdc regulator, Adjustable Regulator, LM317, Regulator Power supply.
By admin
February 28, 2010
Overview
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
Continued…
Posted in Sound Circuit, audio amplifier.
Tagged with 100W audio amp, 100w audio amplifier, 100w guitar amplifier, radio stereo 100, TDA7294.
By admin
February 25, 2010
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.
| Q1 |
BC559 |
| Q2 |
BD139 |
| Q3 |
BD139 |
| Q4 |
BD140 |
| Q5 |
2N3055 |
| Q6 |
2N3055 |
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). Continued…
Posted in Amplifier, Sound Circuit, audio amplifier.
Tagged with 25W Amp MOSFET, 25W Audio Amplifier, 25W Hi-Fi Audio Amplifier, 25W MOSFET amplifier.
By admin
February 23, 2010
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. Continued…
Posted in Amplifier, Sound Circuit.
Tagged with 6W amplifier, 6W audio amplifier, audio amplifier, TDA1010, TDA1010A.
By admin
February 22, 2010
