Audio circuits design projects and schematics

Audio circuits design projects and schematics, various audio amplifiers circuits with diagram and schematic.

2 channel audio mixer circuit using transistors

This 2 channel audio mixer circuit is based on the 2n3904 transistors which forms 2 preamplifiers. The first preamplifier of the 2 channel audio mixer circuit has a high gain and can be used for microphone input, and the second one can be used to control the input of the audio level.

Circuit Diagram: 
2 channel audio mixer circuit using transistors
Electronic Circuits: 

1W audio amplifier circuit using NCP2830

This 1w audio amplifier circuit is designed using NCP2830 audio IC manufactured by ON Semiconductor.
This audio power amplifier ic designed for portable communication device applications and require few external electronic components.
NCP2830 is capable to provide 1W continuous output power in 8 ohms load.

Circuit Diagram: 
1W audio amplifier circuit NCP2830
Electronic Circuits: 

70-90 watt power amplifier circuit using transistors

This 70-90 watt power amplifier circuit is designed using some power transistors and some other common electronic components, and is capable to provide a maximum output power of 90W.
This 70-90 watt power amplifier circuit based on transistors is capable of provide an output of 70W on a load of 8 ohms or 90W on a 4 ohms load.

Circuit Diagram: 
70-90 watt power amplifier circuit using transistors
Electronic Circuits: 

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