100W MOSFET Power Amplifier Circuit
100W MOSFET power amplifier circuit based on IRFP240 and IRFP9240 MOSFETs is shown here. The amplifier operates from a +45/-45 V DC dual supply and can deliver 100watt rms into an 8-ohm speaker and 160-watt rms into a 4-ohm speaker. 100W MOSFET power amplifier circuit this is Hi-Fi amplifier circuit is suitable for a lot of applications like general purpose amplifier, guitar amplifier, keyboard amplifier.
100W MOSFET Power Amplifier Circuit Diagram
Assemble the circuit on a good quality PCB.
Use a +45/-45 V DC, 3A dual supply for powering the circuit.
Power supply voltage must not exceed +55/-55 V DC.
Before connecting the speaker, check the zero signal output voltage of the amplifier and in any case, it should not be higher than 50mV. If it is higher than 50mV, check the circuit for any error. Replacing Q1, Q2 with another set could also solve the problem.
Fit Q7 and Q8 to a 2°C/W heatsink. Both Q7 and Q8 must be isolated from the heat sink using mica sheets. Heat sink mounting kits for almost all power transistors/ MOSFETs of almost all package styles are readily available in the market.
All resistors other than R10, R11 and R19 are 1/4 watt metal film resistors. R10 and R11 are 5W wire wound type while R19 is a 3W wire wound type.