200 - 220 Watts Amplifier Circuit

This high-power amplifier delivers approximately 200–220 W and uses multiple transistor stages for robust output. Each channel (left and right) employs 4 × 2N3055 transistors in the output stage for high current handling. Driver and pre-driver stages use TIP41C and KSP941 complementary transistors for voltage and current amplification.

Power Supply

The amplifier requires a symmetrical power supply of +55V and -55V to properly drive the push-pull output stages and achieve full output power.

Key Features

• High-power output: 200–220 W RMS
• Complementary push-pull output using 2N3055 transistors (4 per channel)
• Driver transistors: TIP41C and KSP941
• Symmetrical ±55V supply for stability and maximum headroom
• Designed for 8 Ω or 4 Ω speakers

Construction Notes

• Mount all 2N3055 output transistors on a large heatsink with good airflow to prevent overheating.
• Ensure proper thermal coupling and use mica insulators if required.
• Keep input and feedback wiring short and separate from high-current output traces to prevent oscillations.
• Include adequate decoupling and bypass capacitors near driver and output transistors for high-frequency stability.
• Use fuses or current limiting in the power supply for protection.