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Mosfet Amplifier Circuits

Mosfet Amplifier Circuits

This article lists various types of audio amplifier circuits using Mosfet.We have tested all these circuits in our lab and we found all of them performing satisfactorily.

Note: This article will be modified with new versions of Mosfet amplifier circuits in future;we shall notify new additions in our home page.

This article contains following list of amplifier circuits using Mosfet.

List of Circuits

1. 18 Watts Mosfet Amplifier

2. 10 Watt Mosfet Audio Amplifier

3. 50 Watt Mosfet Amplifier Circuit

1. 18 Watts Mosfet Audio Amplifier


This circuit is an audio amplifier capable of delivering a decent output power with a minimum no: of parts , with considerable sound quality.
The amplifier employs only one transistor and two MOSFET and few resistors and capacitors in a shunt feedback scheme.This tiny circuit can can deliver a whopping 18Watts into 8 Ohm speaker or 30W into a 4 Ohm speaker.

18 Watts Mosfet Amplifier Circuit Diagram.

stereo amplifier circuit BA5417

2. 10 Watts Mosfet Audio Amplifier


The diagram shown here is of a 10W MOSFET audio amplifier circuit that requires only a single supply. Single rail supply is seldom used in Class-B power amplifiers. Anyway, for low power applications like this it’s quite fine. Actually I got this circuit from an old cassette player that is still working and I am publishing it as it is. The powers MOSFETs BD512 and BD522 are obsolete now and so you may use any other matching power MOSFETS instead of them. Transistors Q1 and Q2 is wired as a Darlington pair works as the preamplifier. Preset R3 controls the quiescent current while R2 provides feedback. Output is coupled to speaker through capacitor C4. Capacitor C5 is the power supply filter and C2 is the input DC decoupling capacitor.

stereo amplifier circuit BA5417