DIY amplifier circuit using MOSFET:

This is a DIY amplifier circuit using 2 MOSFETs. This circuit diagram can make a maximum of 300 watts using 50-0-50 voltage and 6 amperes. We know that voltage X amperes = watts. It’s a mono circuit diagram. For stereo, we have to use 2 boards. positive, negative, and ground voltage needs for this board.

Here use of IRFP9240 is a positive gate MOSFET, and IRFP240 is a negative gate MOSFET.

Power amplifier circuit using transistors:

This is a power amplifier circuit using transistors. It’s a stereo diagram board. Here, use four transistors: two for the left channel and two for the right channel. 100+100 watts of output power using 35-0-35 voltage and 5 amperes. We know that Voltage X amperes = watts. So, 35 × 5 = 175 watts, which we can achieve using a 35-0-35 voltage.

Power amplifier circuit using transistor

This is the Speaker protection circuit diagram. It can protect our Speaker from burns. If the amplifier has any problems, this circuit can save our soundbox. Normally, when the transistor makes a short circuit, the voltage comes out from the speaker output line, and this circuit protects that voltage. This circuit should not allow direct voltage to be sent to the speaker. This circuit is essential for protecting the speaker.