2n3055 Audio Amp Schematic Site

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

This stabilizes the gain and reduces total harmonic distortion (THD). Safety & Build Tips

They boost the signal enough to "drive" the heavy-duty 2N3055s. 2n3055 Audio Amp Schematic

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

💡 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. potentiometer is usually placed here to adjust (to

This design typically follows a push-pull architecture. It uses two 2N3055 transistors as the final power stage to drive an 8-ohm speaker. Key Components Power Transistors: 2x 2N3055 (NPN) Driver Transistors: BD139 (NPN) and BD140 (PNP) Voltage: Dual rail supply ( ±35Vplus or minus 35 cap V Power Output: ~50 Watts into 8 Ohms Step-by-Step Connection Logic Input Stage The audio signal enters through a electrolytic coupling capacitor.

Ensure your transformer is rated for at least 100VA for a mono build. The collectors of the 2N3055s are connected to

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.