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10 Watts Mosfet Audio Amplifier

10 Watts Mosfet Audio Amplifier
The diagram shown here is a MOSFET amplifier circuit 10W of sound that only requires a single source. Single railway material rarely used in power amplifiers class-B. However, for low power applications like this is very thin. Actually I have this circuit a old cassette player is still working and republish as it is. The BD512 and BD522 power MOSFETs is obsolete now and you can use any other power MOSFET game instead of them.

Transistors Q1 and Q2 are connected as a Darlington pair works as a preamp. R3 preset controls the quiescent current, while R2 provides. Output is coupled to the speakers through capacitor C4. Capacitor C5 is the power supply filter and C2 is the input DC decoupling capacitor.


  • The circuit can be assembled on a vero board.
  • Use 30V DC for powering the circuit.
  • Do not expect much performance from this amplifier.
  • Capacitors C3, C4, C5 must be rated 50V and C2 can be 10V.
  • Use a 8 ohm 15W speaker as load.