This is the Class G 300 watt MOSFET Power amplifier circuit with PCB MOSFET. It have more feature, maximum RMS output power: 200 watts at load 8 ohms or 360 watts at the load 4 ohms.
Here is a LM1875 datasheet, used for a 20W audio amplifier on Class AB type. Voltage Gain is 90dB. Low Harmonic Distortion Noise is 0.015%, 1KHz, 8 ohms [...]
This is a HI-FI power amplifier circuit using popular TDA2003-IC from SGS Thomson. The normal operation of the integrated circuit, the music amplifier for car audio radio sound. Which it…