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.
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