We’re talking of course about the carbon microphone amplifier, a piece of telephone technology which made its way into consumer electronics. The carbon microphone is a container of loosely ...

There’s also a simple stereo microphone amplifier for this project that is designed to fit right between the ears. This amplifier was designed in KiCAD, and the PCB is single sided. It’s not ...

The sound enters the microphone, where it is converted into a weak electrical signal. Amplifier The weak signal from the microphone is amplified. Notice how the incoming signal is flatter than the ...