3 Watt HI-FI Stereo Amplifier

Description:

Tr1 and Tr2 transistors functions 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 recommended because of increasing distortion.

Notes:

Speaker's ground must be connected directly to the ground of supply stage and must be kept away from the circuit.

Separate supply connections must be applied to the supply connection points.

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