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Audio electronic circuits

Audio amplifier circuit diagrams, but also preamp, equalizer, mixer and other electrical circuit diagrams.

10W Mini Audio Amplifier

10W Mini Audio Amplifier with very small count of electronic components based around TDA2003 circuit. You can use this powerful amplifier in any small audio... [read]

10W Audio Amplifier with Bass-boost

Audio amplifier that boosts bass tones.... [read]

15 Watt Amplifier

A 15 watt amplifier made using discrete components. Interesting and not so difficult do build.... [read]

18W Audio Amplifier

18W Audio Amplifier made of transistors.... [read]

20W Audio Amplifier using LM1875

20W Audio Amplifier kit is based on LM1875 IC.... [read]

20W Bridge Audio Amplifier

20W Bridge Audio Amplifier kit, based on the TDA2005 IC, a class B dual audio amplifier, specifically designed for car radio applications etc.... [read]

22 Watt Audio Amplifier

22 Watt Audio Amplifier with only one chip TDA1554 ... [read]

25W Mosfet audio amplifier

High Quality simple unit. No need for a preamplifier.... [read]

2N3055 Power Amplifier 60W

2N3055 Power Audio Amplifier circuit diagram... [read]

3 Channel Spectrum Analyzer

This 3 channel 15 LED spectrum analyzer is the perfect addition to any audio amp project. It produces fantastic displays on three LED bars that can be individually... [read]

3 Line Mixer

This project is a 3 or more lines mixer. For more than 3 inputs you can repeat the input parts... [read]

3 Transistor Audio Amp

Here is a little audio amplifier similar to what you might find in a small transistor radio. The input stage is biased so that the supply voltage is divided... [read]

5-Band Graphic Equalizer

This complete high quality, low noise 5-BAND GRAPHIC EQUALIZER circuit is based around Monolithic Linear integrated circuit LA3600 manufactured by SANYO. This... [read]

50 Watt Amplifier

This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device.... [read]

6 Input Mixer

A simple mixer with 3 line inputs and 3 mic inputs using commonly available parts. The mic inputs are amplified about 100 times or by 40dB, the total gain... [read]

60W Guitar Amplifier

Bass, Treble, Harmonic modifier and Brightness controls. Output power: 40W on 8 Ohm and 60W on 4 Ohm loads... [read]

60W Linear amplifier

The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840.... [read]

8 Watt Audio Amp

Here is the schematic for an 8 watt audio amp. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp.... [read]

Amplified Ear

This circuit, connected with 32 Ohms impedance mini-earphones, can detect very remote sounds. Useful for theatre, cinema and lecture goers: every word will... [read]

Amplifier of acoustic frequencies and preamplifier

Tendency of catering: 15V Force of expense: 4,2Wrms in the 4W Minimal signal of entry: 94mVp-p with preamplifier, 0,65Vp-p without the preamplifier.... [read]

Amplifier Timer

This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least.... [read]

Audio Line Driver

This preamplifier has a low output impedance, and is designed to drive long cables, allowing you to listen to a remote music source without having to buy expensive... [read]

Audio Notch Meter

The controls may also be adjusted for use as a band stop (notch) filter or band pass filter.... [read]

Audio Perimeter Monitor

Used to detect sound in some area. This circuit has only two transistors and several passive components... [read]

Audio VU meter 9 leds

5 LED VU Meter kit is based on LB1409 IC from SANYO, which will indicates the volume level of the audio signal it senses... [read]

Automatic Loudness Control

In order to obtain a good audio reproduction at different listening levels, a different tone-controls setting should be necessary to suit the well known behaviour... [read]

Bass-treble tone control circuit

The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control... [read]

Cheap Audio Booster

Cheap Audio Booster ... [read]

Class-A-AB Amplifier 100w

A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker... [read]

Digital Volume Control

Adjust volume digitaly on your analog devices... [read]

Dynamic Microphone Preamp

A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance... [read]

ECM Mic Preamplifier

A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components... [read]

Electronics Attenuator

Two low voltage, low power zeners are used to control electronically the level of an audio signal. The attenuation range is from 6 to 58dB for an input current... [read]

FET Audio Mixer

This simple circuit mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consumes... [read]

Guitar Amplifier

The aim of this design is to reproduce a Combo amplifier of the type very common in the sixties and the seventies of the past century.... [read]

Headphone Amplifier

An amplifier to drive low to medium impedance headphones built using discrete components... [read]

Improved 3 Transistor Audio Amp

This circuit corrects the problem somewhat and allows a larger voltage swing and probably more output power, but I don't know how much without doing a lot... [read]

Infrared cordless Headphone Amplifier

Infrared cordless Headphone Amplifier circuit diagram.... [read]


This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage ... [read]

Laser Communication System

Audio wireless transmitter and receiver. It uses laser beam from laser pointer to transmit audio signal. Not so applicable, but very interesting and easy circuit... [read]

Low impedance microphone amplifier

The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. ... [read]

Mini-box 2W Amplifier

Mini-box 2W Amplifier Designed for self-powered 8, 4 & 2 Ohm loudspeakers. Contains Bass-boost switch.... [read]

Motorola Hi-Fi power amplifier

This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like it is shown in the table (from 20 W to 80 W RMS)... [read]

Op-Amp Microphone Preamp

Audio preamplifier designed for dynamic or electret microphones. Uses several components which are easy to find. It has a 23.5k ohm input impedance. It can... [read]

Peak Reading Audio Level Meter

This circuit has minimal number of components and it's easy to build. It measures peak level of a sound signal. It uses ... [read]

Phono Preamplifier

In recent years, following CD's introduction, vinyl recordings are almost disappeared. Nevertheless, a phono preamplifier is still useful for listening old... [read]

Portable Audio Amplifiers

It is designed for portable cassette players and radios. You can also use it as your PC Audio Amplifier. A few external components required to build this circuit.... [read]

Portable Headphone Amplifier

Can be directly connected to CD players, tuners and tape recorders.... [read]

Portable Microphone Preamplifier

This circuit is mainly intended to provide common home stereo amplifiers with a microphone input.... [read]

Portable Mixer

The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery, keeping high quality performance.... [read]

Precision Audio Millivoltmeter

Precision Audio Millivoltmeter. Uses audio for measuring voltage.... [read]

Quadraphonic Amplifier

This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels... [read]

Sound Level Meter

This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole... [read]

Speaker Box Audio Amp

Amplifier for your computer. Very serious electronic project.... [read]

Speaker Microphone Circuit

This circuit takes an ordinary loudspeaker and allows it to be used in reverse, as a microphone. ... [read]

Stereo Preamplifier with Bass-boost

This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing a gain of 4, in order to drive less sensitive power amplifiers.... [read]

Stereo tape head preamplifier using LA3161

Stereo tape head preamplifier using LA3161 circuit diagram... [read]

Stereo Tube Amplifier

The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer.... [read]

Three Channel Audio Mixer

Three Channel Audio Mixer circuit diagram... [read]

Three-Level Audio Power Indicator

This circuit is intended to indicate the power output level of any audio amplifier. It is simple, portable, and displays three power levels that can be set... [read]

Tiny audio amplifier using LM386

Small audio amplifier for weak signals. Simple to build.... [read]

Universal Preamplifier

Useful for amplifying weak signals before amplifier.... [read]