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12v Battery Voltage Monitor circuit with LM339 comparator

voltage comparator circuit

voltage comparator circuit

In the circuit having a voltage quad comparator (LM339) is used as a simple bar graph meter to indicate the state of charge 12-volt lead-acid battery acid. A 5 volt reference voltage is in each of the (+) inputs of four comparators and the (-) inputs are connected, each point is connected to a voltage divider. The LED lights up when the voltage at the negative (-)-input exceeds the reference voltage. Calibration can be by adjusting the 2K potentiometer so that all four LEDs illuminate when the battery voltage is 12.7 volts indicates a full charge with no alrmcompload on the battery is done. At 11.7 volts, the LED should be made, and shows an empty battery. Each LED is a change of about 25% charge or 300 millivolts, so that 3 LEDs indicate 75%, 2 LEDs indicate 50%, etc. Continued…

Posted in Battery Charger, LED Circuit, Power supply, Switch circuit. Tagged with , , , , .

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March 17, 2010

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Simple Guitar Distortion Effect (Fuzz) Circuit

distortion circuit

distortion circuit

Overdrive is the only extreme clipping distortion.
You can use your clip PWM output when the input level is too high.
You back-to-back diodes in the feedback loop REG.
You can conduct two cooking FPGA-to-back diodes, which are connected to the mainland.

The parts for this Distortion Effect (Fuzz) are:
J1 – J2: 1/4 INCH MONO FEMALE CHASIS MOUNTING JACKS
C1 – C5: 0.1 MICROFARAD CERAMIC DISC CAPACITORS AT 50V
P1: 100M POTENTIOMETERS
P2: 10K POTENTIOMETERS
R1 – R2: 1K RESISTORS
D1 – D2: GENERAL PURPOSE DIODES
IC1: 741 OP AMP

Circuit, which is Audioguru describes the simplest type of distortion type overdrive and could be described as fluff.
Much will depend on the exact type of overdrive you want. If this is the kind of overdrive that you get the amplifier to the maximum, then distorted and leads quite dificult.
This can be done efficiently using the amplifier and speaker is overloaded and ecoustically balanced miced and again.
All sorts of things in the game, phase shift, attenuation, Come Get disruption speakers, etc.

Sound channel distortion in non-linear amplifier (changing course). This type of signal distortion is particularly desirable for many guitarists. Originally, this type formed in a clay tube amplifiers. The only problem is that the amplifier valve is only suitable for the production of sound at a very high volume. It is ideal for live entertainment, but otherwise.

On Dummy Load (non-durable good, it should be) to simulate the reactive load speaker amplifier player in different game situations and styles, using the “amplifier to the desired level, and dummy load to regulate the volume.

However, replacing the silicon age, the new design of tube amps solids, and now those options are for the rich musicians! On the other hand, some solid state linear amplifier design is similar distortion sounds and other types of distortion sounds. The great advantage is that non-linear amplification can be made in advance to the amplifier and distortion, and lower production volume is also available.

Here is a simplified circuit distortion pedal that I built. It is designed to work in a consistent performance. The first step is biased, the voltage followers (buffer) upon entry into the Vcc / 2 for each offer. The second step is a soft high-gain AC amplifier cutting. Unity DC gain amplifier output is changed VDC / 2 low-pass filter on the output filter high frequency components (too much fuzz otherwise). Input and output is connected to AC.

With this device, 9V battery for power, gain control in the second step, illustrated volume control on the output and footswitch to avoid disruption of (not).

I use this camera with a guitar processor is preparing to add some delay / reverb. There is a useful noise Nice for solo and string energy leader.

Posted in Sound Circuit, audio amplifier. Tagged with , , , , .

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March 16, 2010

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Infrared Remote Controller and Transmitter Circuit with IC4013

IR remote controller Circuit

IR remote controller Circuit

I have a number of switch / out with an infrared remote control TV as a transmitter, which is great for me to work yet there is something that I add, or you must remove or change to better? 4013 is configured to switch on / off switch, namely the production will remain high until the clock is replaced by a high level, and will remain until replaced by another , then the output will go low, and so on. if the TV remote control is pressed, it sends the signal (pulse) to the receiver, making the CLK output transistors have to activate the double flip-flop IC, I, nor the 47uF capacitor, so if it is considered that the pulse is High input CLK, while the TV remote control is pressed when you press the remote (off), the pull-down resistor 10K, stream discharge capacitor and the output remains high until the process happens again, then the output remains low, and so on.

IR Remote Transmitter Circuit
IR Remote Transmitter Circuit

4013, that the isolates from large voltages / currents. Inside the 3011 is an LED and a photo-transistor. The LED lights up when Q goes high, and in return the photo could transistor. Alternatively, the IC triggers a triac.

What I want to do is develop the setup to be triggered with the touch switches work or a facility managed by infrared.

Here is a diagram of the original circuit. I crossed the touch-switch on the top because they do not work properly. Now there are two resistors, capacitor, and a trigger for clock generation Schmit

Posted in Power supply, Switch circuit. Tagged with , , , , .

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March 15, 2010

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Headphone Amplifier Circuit using Op-Amp

To be done from the beginning until the first Headamp headamp TR, but I know from all the op-amp used headamp is now more than 3 months to several op-amp number then listen Take a test.

headphone using op-amp circuit

headphone using op-amp circuit

Op-amp be tested as follows. (Almost all the Brow Brow ).

- OPA134 is OPA2132P OP-amplifier with a series CMOY Headamp a first OP amplifier used in all major DIY together.
- OPA637 op-amp is expensive to visit each other more western.
- OPA2111 op-amp, which is actually recommended by SEPK a barometer than a bad audio.
- OPA602 op-amp is recommended that listens well to the seller.
- Is NE5532 op-amp, cheap, but expensive audio is often used as a second class, the Thai new pot and possessed by us morally.
- TL071, 072 op-amp market, but 5532 sounds like 5532 is not to fight.
- OPA2107 friends recommended trying gadget 2111th Review
- OPA2227, 2228th
************************************************** . *********************.
OPA134, 2134, 132, 2132nd
************************************************** . *********************.
132,134 to a single op-amp 1 is the op-amp is only 1 in section 2132.2134 dual op-amp 1 is the op-amp has an internal 2nd
And audio version of x134 is x132 or x134 do with the building block of audio. Therefore, the bandwidth is narrower than the x132.

Voice of the x132, x134 is the op-amp the bass is very good bass.
If the sound is dense 2132pa other bits.
If 134,2134,2132 p sounds good enough to enter the relevant data .
The middle voice is a little off. (In order to avoid this is not นะ. How do you fight a different number) is not only the number.
If there is no distortion of the Class A Little Voice will narrow.
When taken to cycles Cmoy best dual op-amp because of the high flow rate.
________________________________________________. Continued…

Posted in audio amplifier. Tagged with , , , , , , .

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March 14, 2010

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Hifi Headphone Amplifier Circuit with TIP41,42

Hifi headphone amplifier circuit

Hifi headphone amplifier circuit

An amplifier with low impedance drive means of headphones built using discrete components.
Output at 0.25W into 50 ohms and 1W into 8 ohms

input control with 100K pot

The two halves of the circuit are identical. Both entries have a continuous path to ground via the input 47k control which should be a dual log type potentiometer. The balance control is a single 47k linear potentiometer, which adapt the center of the damping of the input signal to prevent signals on the left and right. If the balance control on the left side is moved, the entrance to the left lane with less resistance than the right lane and the left channel by more than the right side and vice versa. The 10k above resitors ensure that neither input can be shorted “to earth. Shall be sent to The gain of the audio signal from a single stage of the procedure and a common emitter amplifier direct coupled emitter follower. Overall, receiving less Continued…

Posted in audio amplifier. Tagged with , , , , , , .

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March 13, 2010

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Simple 2Watt Audio Amplifier Circuit with LM386

lm386 circuit pcbLM-386 audio amplifier DIP-style package. Note the optional circuit board connections (jumpers), amortization and-l’accent is ideal for use with (two lanes) shows the receptors of radio communications. Connect a 1K) 8-ohm matching transformer (in reverse order of the circuit, an airline pilot () balanced or unbalanced output.
If the amplifier with a polarity reverse to the impedance matching transformer at the same time, it would be desirable to reduce some heavy padding resistive (damping) to step up voltage transformer-up. (Actually, I just wanted the word “caution” somewhere …) I did a lot of audio line driver circuit with the LM-386. The type of transformation may be almost entirely practical. The output transformer wire winding can be both balanced and UN-Balenced outputs.

Switching capacity of 386-lm-circuit with a PNP type transistor for audio with a receiver gating COS / logical line horn. Wilson has used the brand’s original two-way VHF radios that approach. Another method involves muting (primary) shunt volume pot wiper. Continued…

Posted in Amplifier, audio amplifier. Tagged with , , , , .

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March 12, 2010

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Car Preamplifier and Artificial Earth Circuit With TL071

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 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 , , , , .

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March 6, 2010

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Flyback driver circuit for 10KV to 30KV

Flyback 10KV-30KV 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.

Posted in Power supply. Tagged with , , , , .

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March 5, 2010

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Hi-Fi Audio Preamplifier Circuit With TL072 opamps

For a complete HI-FI amplifier (with EQ and) with the possibility of PCB mount pots is something p97-raI 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 , , , , .

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March 4, 2010

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6V at 1A Battery Charger Circuits with IC Regulator

battery charger circuit with IC regulator

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 , , , , , , , .

By admin
March 3, 2010

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