3W HI-FI Stereo Amplifier by 2N1613

Tr1 and Tr2 transistors funcitons as direct coupled voltage amplifiers. R6 resistor, D1 and D2 diodes determine the standby current of complement driver stage (Tr3/Tr4) and output stage (Tr5/Tr6). C3, C5, C6 and R3 help keeping stability. Amplifier’s input sensitivity is 400mA at 4 ohm load and 12V supply and 600mV at 8 ohm load and 17V supply.

Gain can be increased by decreasing R4 value but it is not recommenden bacause of increasing distortion.

Read more source:http://www.circuit-projects.com/3-watt-hi-fi-stereo-amplifier.html
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