Fan speed controller using LM2941

jacky April 22, 2010 29 Comments
Description. Many electronic circuits related to fan speed controlling have been published here and this one is just another approach. The circuit diagram shown here is of 12V DC fan speed controller using the IC LM2941CT which is a...
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FM remote Encoder/Decoder

jacky April 22, 2010 23 Comments
Description. Here is the circuit diagram of an FM remote encoder/decoder using the ICs RF600E and RF600D. These devices are designed to provide a high level of security and operates from anything between 2 to 6.6V DC. Various electronic...
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Low cost Mic Mixer

admin April 21, 2010 3 Comments
Description This is the schematics of a low cost mic mixer that can be assembled from the components in your junk box.This two channel mike mixer is designed for handling high impedance dynamic microphones.Transistor Q1 can be any general...
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Three phase auto changer circuit

jacky April 7, 2010 12 Comments
Description. The circuit given here is designed by Mr.Seetharaman V.S (seethasub@hotmail.com) from Chennai. Seetharaman’s comments about the circuit: This circuit is a modification of  High & Low voltage cut-off with delay& alarm circuit  appeared in Circuits today, which I...
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USB sound card

jacky April 7, 2010 13 Comments
Description. Designing and building a USB sound card is no longer a head ache because we have got the PCM 2702 integrated circuit from Texas Instruments. The PCM2702 is an integrated 16 bit digital to analog converter that has...
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40W amplifier using TDA1514

jacky April 7, 2010 16 Comments
Description. Many electronic circuits dealing with audio amplifier circuits have been published here. This is just another one and here we use the TDA 1514 high performance hi-fi amplifier from Philips. The IC has a bunch of useful features...
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Voltage doubler circuit using NE555

jacky January 22, 2014 34 Comments
Description. The circuit diagram of a very simple voltage doubler using NE555 timer is shown here. Here IC NE555 is wired as an astable mutivibrator operating at around 9KHz. The base of the two transistors (Q1 and Q2) is...
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3 way active cross- over network

jacky April 7, 2010 12 Comments
Description. Here is the schematic of a 3 way active cross- over network circuit that finds a lot of application in audio amplifier systems. The heart of this circuit is National Semiconductor’s IC LF353 which is a dual JFET...
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2 x 32 Watts stereo amplifier

jacky March 8, 2011 56 Comments
Description. The circuit given here is of a 2 x 32 Watt stereo amplifier using the famous TDA2050V IC from ST Microelectronics. The TDA2050V is an integrated monolithic 32 watt class AB audio amplifier IC available in the Pentawatt...
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4 X 15 Watt power amplifier

jacky April 7, 2010 10 Comments
Description. A lot of electronic circuits in the domain of audio amplifiers are already been published here. This circuit is a little different because it is a four channel amplifier. Each channel of this amplifier can deliver an output...
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