3W HI-FI Stereo Amplifier by 2N1613
TR1 and TR2 transistors funcitons as a direct link voltage amplifier. R6 resistor, D1 and D2 diodes determine standby current complement driver stage (Tr3/Tr4) and output stage (Tr5/Tr6). C3, C5, C6 and R3 will help to maintain stability. The amplifier is the input sensitivity is 400 ma at 4 ohm load and 12V supply and 600mV for 8 ohm load and 17V supply. [...]
