2n3055 Audio Amp Schematic Info

A small-signal transistor (like a BC547 or 2N2222) acts as the initial pre-amp/differential pair. The BD139 and BD140 transistors form a complementary pair.

as these transistors generate significant heat during operation. emitter resistors to provide thermal stability. Feedback Loop A resistor (typically ) connects the output back to the input stage. 2n3055 Audio Amp Schematic

💡 Use mica insulators and thermal grease when mounting 2N3055s to a shared metal heatsink. Fusing: Place 2A fuses on both the +Vpositive cap V −Vnegative cap V rails to protect the transistors from shorts. A small-signal transistor (like a BC547 or 2N2222)

They boost the signal enough to "drive" the heavy-duty 2N3055s. emitter resistors to provide thermal stability

Ensure your transformer is rated for at least 100VA for a mono build.

potentiometer is usually placed here to adjust (to prevent crossover distortion). Output Stage (The 2N3055s)

The collectors of the 2N3055s are connected to the positive and negative power rails.