20W Car Booster 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....
Automatic Audio level control with NE570
The NE570 can be used to make a high performance compressor FTA, except that the rectifier is connected to the input. This makes gain inversely proportional to ...
VU Meter with Audio Mixer circuit
This is audio mixer circuit. The circuit is for one channel input, if you need, for example 5 channel mixer, then you need to build 5 similar circuits....
Subwoofer Controller
The circuit is completely conventional, and has been around almost forever in one guise or another. Similar circuits were used in the valve (tube) era, so there...
Bass-treble, Volume, balance and Loudness control
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 i...
Digital Volume Control with DS1669
This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN butt...
Sound Level Indicator LM3915
This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provide...
low pass filter subwoofer
The acoustic filters are met in various points in the sound systems. The knownest application they are the filters baxandal for regulating tone low and high fre...
1 Transistor Audio Mixer
This is a classic signal mixer that is used for audio purpose. VR1 & VR2 are inputs audio volume controlers and VR3 is used to control the balance between Input...
Tone Control Schematic
Based on the classic Baxendall tone control circuit, this provides a maximum cut and boost of around 10dB at 10KHz and 50Hz. As the controls are passive, the fi...
TDA1524 Stereo Tone Control
This simple tone control can be used in may audio applications. It can be added to amplifers, used as a stand alone control module, or even built into new and ...
Surround Sound Decoder
This is a simple surround sound decoder. Left & right outputs of a stereo tape or CD player can be connected to the circuit inputs and 4 outputs of the circuit ...
Loudspeaker as a Microphone
This circuits allows you to use a cheap loudspeaker as a microphone. Sound waves reaching the speaker cone cause fluctuations in the voice coil. The voice coil...
Audio splitter
This circuit is suitable to amplify and distribute the audio signals. The input audio signal is applied to the J1 and after passing through the P1, It is buffer...
Intercom circuit with LM380
Very simple and useful circuit for communication between two person. The Q1 is used to amplify the weak output signal of speaker when one push his (her) side pu...
10 Band Audio Equalizer
This circuit allows you to equlize the audio signals in ten band. It uses low cost op-amps to form a professional equalizer circuit. The heart of the design is ...
Simple Electronic Metronome
Metronome is an electronic device that keeps rhythm by making regulated clicking sounds, device used to keep the beat while playing a musical instrument. The ci...
8 Note Tune Player
This neat little circuit can play 8 note tunes at any speed you want. You select the notes with 8 trim pots. The speed in selected through a ninth pot. The circ...
crystal Op Amp Radio
Here is a simple radio that is easy to build and inexpensive. In fact, you probobly have all the parts you need in your junk box. You`ll be suprised at the grea...
HI-FI Stereo Encoder / Multiplexer
This stereo encoder is the perfect solution for those looking for a high quality stereo sound transmission at a low cost. This stereo encoder produces an excell...