Review on 🔊 HiLetgo Electret Microphone Amplifier MAX4466 Module: Adjustable Gain Blue Breakout Board for Arduino - 2pcs Set by Melissa Walker

Not only can they be used as sound level sensors in many projects, but they can also be used as real microphones that can be connected directly to a preamp, mixer or A/D converter. . If you use a 5 volt supply, the output levels will be close to 5 volts, even because of background noise, and any intended input signal will be clipped. Using 3.3 volts on an Arduino or Pi gives you about 2 volts of ground, which eliminates most clipping. There is a bit of noise at the output so I'll try 2.5 volt VCC. Great find.