2.1 amplifier schematic using the 2SC5200 and 2SA1943 complementary power transistor pair, in a 184 KB PDF. These Toshiba transistors are a standard choice for discrete audio output stages. Use the diagram to trace the driver and output stages, bias network and supply rails, or to locate a shorted output device. Counterfeits of this pair are widespread, so source genuine parts and set the quiescent current carefully after any repair.
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