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Audio circuit diagrams

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

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 of testing.
[View Improved 3 Transistor Audio Amp circuit diagram]

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 equally across the two complimentary output transistors which are slightly biased in conduction by the diodes between the bases.
[View 3 Transistor Audio Amp circuit diagram]

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.
[View Amplifier Timer circuit diagram]

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
[View Audio VU meter 9 leds circuit diagram]


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
[View Intercommunication-Intercom circuit diagram]

60W Linear amplifier

The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840.
[View 60W Linear amplifier circuit diagram]

Cheap Audio Booster

Cheap Audio Booster
[View Cheap Audio Booster circuit diagram]

Universal Preamplifier

Useful for amplifying weak signals before amplifier.
[View Universal Preamplifier circuit diagram]

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.
[View Portable Audio Amplifiers circuit diagram]

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 circuit is very easy to build and has good Quality.
[View 5-Band Graphic Equalizer circuit diagram]

200W Audio Amplifier

[View 200W Audio Amplifier circuit diagram]

Infrared cordless Headphone Amplifier

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

Three Channel Audio Mixer

Three Channel Audio Mixer circuit diagram
[View Three Channel Audio Mixer circuit diagram]

20W Audio Amplifier using LM1875

20W Audio Amplifier kit is based on LM1875 IC.
[View 20W Audio Amplifier using LM1875 circuit diagram]

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.
[View 20W Bridge Audio Amplifier circuit diagram]

Stereo tape head preamplifier using LA3161

Stereo tape head preamplifier using LA3161 circuit diagram
[View Stereo tape head preamplifier using LA3161 circuit diagram]

Tiny audio amplifier using LM386

Small audio amplifier for weak signals. Simple to build.
[View Tiny audio amplifier using LM386 circuit diagram]

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)
[View Motorola Hi-Fi power amplifier circuit diagram]

Speaker Box Audio Amp

Amplifier for your computer. Very serious electronic project.
[View Speaker Box Audio Amp circuit diagram]

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 input allows loudness compensation to be simply effected.
[View Bass-treble tone control circuit circuit diagram]

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.
[View Amplifier of acoustic frequencies and preamplifier circuit diagram]

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 adjusted for any particular frequency range.
[View 3 Channel Spectrum Analyzer circuit diagram]

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. Audio input can be from any two-channel line level device such as a television, CD player, or VCR.
[View Stereo Tube Amplifier circuit diagram]

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 circuit is based on the LM3915 audio level IC and uses only a few external components.
[View Sound Level Meter circuit diagram]

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 very little power. The mixer is shown with two inputs, but you can add as many as you want by just duplicating the "sections" which are clearly visible on the schematic.
[View FET Audio Mixer circuit diagram]

60W Guitar Amplifier

Bass, Treble, Harmonic modifier and Brightness controls. Output power: 40W on 8 Ohm and 60W on 4 Ohm loads
[View 60W Guitar Amplifier circuit diagram]

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.
[View Guitar Amplifier circuit diagram]

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 to any desired value.
[View Three-Level Audio Power Indicator circuit diagram]

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 of the human ear. In fact, the human ear sensitivity varies in a non-linear manner through the entire audible frequency band, as shown by Fletcher-Munson curves.
[View Automatic Loudness Control circuit diagram]

10W Audio Amplifier with Bass-boost

Audio amplifier that boosts bass tones.
[View 10W Audio Amplifier with Bass-boost circuit diagram]

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. As modern Hi-Fi home equipment is frequently fitted with small loudspeaker cabinets, the bass frequency range is rather sacrificed.
[View Stereo Preamplifier with Bass-boost circuit diagram]

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.
[View Portable Mixer circuit diagram]

Portable Microphone Preamplifier

This circuit is mainly intended to provide common home stereo amplifiers with a microphone input.
[View Portable Microphone Preamplifier circuit diagram]

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 be clearly heard.
[View Amplified Ear circuit diagram]

Phono Preamplifier

In recent years, following CD's introduction, vinyl recordings are almost disappeared. Nevertheless, a phono preamplifier is still useful for listening old vinyl discs from a well preserved collection.
[View Phono Preamplifier circuit diagram]

Precision Audio Millivoltmeter

Precision Audio Millivoltmeter. Uses audio for measuring voltage.
[View Precision Audio Millivoltmeter circuit diagram]

Portable Headphone Amplifier

Can be directly connected to CD players, tuners and tape recorders.
[View Portable Headphone Amplifier circuit diagram]

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 project. It is very small (6.5 x 4.5 cm). It outputs 10W and uses a 9V battery.
[View 10W Mini Audio Amplifier circuit diagram]

18W Audio Amplifier

18W Audio Amplifier made of transistors.
[View 18W Audio Amplifier circuit diagram]

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 from 0.042 to 77 mA corresponding to a control voltage from 2.7 to 7.5V.
[View Electronics Attenuator circuit diagram]

3 Line Mixer

This project is a 3 or more lines mixer. For more than 3 inputs you can repeat the input parts
[View 3 Line Mixer circuit diagram]

Low impedance microphone amplifier

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

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.
[View 50 Watt Amplifier circuit diagram]

25W Mosfet audio amplifier

High Quality simple unit. No need for a preamplifier.
[View 25W Mosfet audio amplifier circuit diagram]

Audio Perimeter Monitor

Used to detect sound in some area. This circuit has only two transistors and several passive components
[View Audio Perimeter Monitor circuit diagram]

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 to build.
[View Laser Communication System circuit diagram]

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 being directly controlled from the sound card itself.
[View Quadraphonic Amplifier circuit diagram]

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
[View Peak Reading Audio Level Meter circuit diagram]

Audio Notch Meter

The controls may also be adjusted for use as a band stop (notch) filter or band pass filter.
[View Audio Notch Meter circuit diagram]

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 screened cables
[View Audio Line Driver circuit diagram]

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 with the mixer is 46dB.
[View 6 Input Mixer circuit diagram]

Class-A-AB Amplifier 100w

A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker
[View Class-A-AB Amplifier 100w circuit diagram]

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 be used to amplify weak signals other than from microphone.
[View Op-Amp Microphone Preamp circuit diagram]

Headphone Amplifier

An amplifier to drive low to medium impedance headphones built using discrete components
[View Headphone Amplifier circuit diagram]

Dynamic Microphone Preamp

A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance
[View Dynamic Microphone Preamp circuit diagram]

ECM Mic Preamplifier

A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components
[View ECM Mic Preamplifier circuit diagram]

15 Watt Amplifier

A 15 watt amplifier made using discrete components. Interesting and not so difficult do build.
[View 15 Watt Amplifier circuit diagram]

22 Watt Audio Amplifier

22 Watt Audio Amplifier with only one chip TDA1554
[View 22 Watt Audio Amplifier circuit diagram]

Speaker Microphone Circuit

This circuit takes an ordinary loudspeaker and allows it to be used in reverse, as a microphone.
[View Speaker Microphone Circuit circuit diagram]

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.
[View 8 Watt Audio Amp circuit diagram]

Digital Volume Control

Adjust volume digitaly on your analog devices
[View Digital Volume Control circuit diagram]

2N3055 Power Amplifier 60W

2N3055 Power Audio Amplifier circuit diagram
[View 2N3055 Power Amplifier 60W circuit diagram]

Mini-box 2W Amplifier

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

..:: Important ::..

Read disclamer, please!


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