3-stage BJT Electret mic audio amplifier

I’m engaged on a faculty undertaking the place I have to design and construct a easy audio amplifier for an electret microphone. The microphone’s bandwidth is roughly 40 Hz to twenty okayHz, and the purpose is to amplify its sign sufficient to drive a 3W@8 ohm speaker utilizing a 9V energy provide.

The design I’m aiming for makes use of three BJT phases. The first two phases are widespread emitter amplifiers, every offering a voltage achieve of round 26. This ought to give me an output of about 7 volts peak, which I…

3-stage BJT Electret mic audio amplifier