Audio Circuits

Audio Circuits

Guitar pre-amplifier using uA 741.

Description. A preamplifier circuit suitable for high impedance type electric guitar pickups is given here.The circuit is based on a uA 741 op-amp (IC1).The IC1 is wired as a non-inverting amplifier.The POT R1 can be used as a volume controller.The POT R6 can be used as tone controller.The switch S1 is used to produce “brilliant” […]

Audio Circuits

Magnetic pickup pre-amplifier circuit.

Description. A preamplifier for magnetic pickups of record players is shown here.The uA 741 is used as an AC coupled non-inverting amplifier operating on a single supply.The amplifier gain is decided by the feedback components in which C2 controls the low frequency roll-off characteristics while C4 reduces the gain at high frequency end to compensate

Audio Circuits

Crystal pickup pre-amplifier circuit

Description. A preamplifier operating on a single supply and suitable for use with high impedance type crystal pickups is shown here.The circuit is basically a non-inverting AC amplifier in which the gain is dependent on the feedback resistor R4.The smaller is the R4,the lower will be the gain.The low frequency roll off characteristics are decided

Audio Circuits, Industrial Circuits

Power megaphone circuit

Description. Just about any power transistor can be used in  this megaphone.Its suitable for boats,playing fields etc.the transistors Q1  & Q2 are the HEP-230 type which are easily available in the market.The transistors are parallely connected to handle the required power and speaker matching.The microphone is a carbon type like that used in telephone hand

Audio Circuits

Head phone amplifier circuit

Description. Here is a simple head phone amplifier circuit that can be used to drive your head phone if your music player doesn’t have  enough power to drive your head phones.The circuit is straight forward and uses only three transistors. The transistor Q1 (BC 239) and associated components forms a pre amplifier.The transistor pairs Q2

Audio Circuits, Test & Measurement Circuits

Sound pressure meter

Description. Here is a simple circuit that can be used to check the sound levels.The sound pressure meter is vey useful in setting up home theater systems , if you need to test the sound pressure of each channels on different positions in the room. The circuit is nothing but a non- inverting amplifier based

Audio Circuits

Speech amplifier circuit.

Description. This circuit given here can be housed in the box containing the speaker to form a handy microphone amplifier.The device can be used by teachers,guides,lecturers etc for speaking in a crowdy or noisy environment. The circuit is designed base on the audio power amplifier IC TDA 7052.The IC can deliver a maximum power output

Audio Circuits

Sound shifter circuit

 Description. Here is superb sound shifter circuit that can be used to add effects to the input sound signal.The circuit is ideal for incorporating in toys and adds great fun.The circuit can be also used in mixers and recorders. The circuit is based on IC HT 8950 from Holtek. The IC HT8905 is a single

Audio Circuits

3 Band graphic equalizer circuit.

Description. Here is a simple 3 band graphic equalizer circuit  made of a single op amp IC LF351 (IC1) and few passive components.The component values of this circuit are not very critical and can be replaced with nearest values with a little loss on the performance.This feature make it easy to be assembled from your

Audio Circuits

50 W transistor amplifier

Description.  A very rugged and reasonably power amplifier circuit that can be used  for any audio applications. The amplifier produces 60W rms at 50V supply  on a 8 Ohm load.The circuit is designed such that most of the components are not critical and can be easily replaced by nearest values.This make it ideal to assemble

Audio Circuits

Low cost amplifer.

Description. No big deal here! You can make a decent power amplifier using just three transistors. All components used here can be obtained from your electronic junk box. Also you just need a 9V transistor radio battery to power this circuit. The circuit is ideal for a pocket radio or other hand held audio equipments.

Audio Circuits, Transmitters

IR Headset

Description. Here is a simple IR headphone circuit that is suitable for listening to TV or radio with out disturbing others. For beginners the IR headset is a better option than FM head sets because they often produce desirable sound quality with out tuning as well as difficult impedance matching that is often done  in 

Audio Circuits

3 W Stereo amplifier using MAX 7910

Description. A straight forward circuit diagram of a 3W stereo amplifier circuit using MAX 7910 IC is given here. This circuit is ideal for small power audio applications like portable CD players or radio sets. The circuit is designed strictly as per the datasheet and found to be working great. The MAX9710  a stereo audio

Audio Circuits

Audio level meter circuit

Audio Level Meter Description A simple and low cost audio level meter circuit that can be used to measure the audio level of your sound source.This circuit is a valuable tool for those who are interested in audio circuits. The circuit is designed with a flat frequency response in the range of  20Hz to  50Khz.

Amplifier Circuits, Audio Circuits

Hi Fi Amplifier circuit

Hi Fi Amplifier Circuit – 2X12 Watts HiFi or High fidelity is a term used to indicate equipment that reproduces a high quality of sound. The highlight of Hi-Fi equipment is inaudible noise or distortions and a natural frequency response. Hifi amplifiers are known to create sounds with utmost clarity so it is a dream of all

Amplifier Circuits, Audio Circuits

Mini Audio Amplifier circuit

Mini Amplifier Circuit Audio amplifiers are electronic amplifiers that are used to amplify weak audio signals from an input like a mic to high amplitude signals to be reproduced through loudspeakers. This is a very simple hobby project suitable for beginners. This homemade mini amplifier circuit is suitable to hone your soldering skills and show off

Audio Circuits

Transistor Amplifier Circuit-12 Watts

12 Watts Transistor Amplifier Circuit Description The circuit shown below is not at all expensive as the amplifier contains only an op-amp and four transistors (easily available from your electronics junk box). Here the op-amp used is uA 741 which produces the required gain. The four transistors are wired as complementary Darlington’s which produces the

Audio Circuits

Tweeter Crossover circuit

In this guide, we’re building a fun project (well, ‘tweet’ generating circuit is obviously fun to build, but tweet crossover reduction is purely geeky!)  – which is a Tweeter Crossover Circuit. This simple design is developed using two capacitors and a potentiometer. Very easy to build and you gain lots of concepts in crossover reduction

audio distortion meter
Audio Circuits, Test & Measurement Circuits

Audio Distortion Meter

Audio Distortion Meter An audio distortion meter is used to measure distortions in, yes you guessed it right, audio. At certain frequencies the sound from most audio devices distorts, they become unclear. Of course, the frequencies and the level of distortions vary from device to device. A distortion meter helps to find the level of

Audio Wattmeter
Audio Circuits, Test & Measurement Circuits

Audio Wattmeter Circuit

Audio Watt Meter How do you measure the power output of an amplifier? using an Audio Wattmeter. the name Audio Watt Meter’ is a collective name for all devices that are used to measure the output of an amplifier, so many kinds of equipment fall under this category. What we intend in this project is

Audio Circuits, Light Related

Musical light chaser circuit

In this project guide, we’re doing a simple Musical Light Chaser circuit using two digital IC’s and some associated components. This is basically a hobby circuit, which you can build for Halloweens or Christmas decorations. Description Here is a simple state of the art musical chaser circuit that can be used in discotheques or even

Amplifier Circuits, Audio Circuits

Power Amplifier Circuit using TDA2009

Power Amplifier Circuit – 25 Watts Here is the diagram of a 25 Watt power amplifier circuit made of  TDA2009 IC. TDA2009 IC is a hi-fi Class AB stereo amplifier in a multi watt package. It is actually a dual audio power amplifier that is designed specifically for very good quality stereo applications. TDA2009 is

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