18W Audio Amplifier

High Quality very simple unit -- No need for a preamplifier Can be directly connected to CD players, tuners and tape recorders. Don`t exceed 23 + 23V supply. Q3 and Q4 must be mounted on heatsink. D1 must be in thermal contact with Q1. Quiescent current (best measured with an Avo-meter in series with Q3 Emitter) is not critical. Adjust R3 to read a current between 20 to 30 mA with no input signal.
18W Audio Amplifier - schematic

* * * * * * To facilitate current setting add R8 (optional). * A correct grounding is very important to eliminate hum and ground loops. Connect in the same point the ground sides of J1, P1, C2, C3&C4. Co

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