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...Another easy solution is to use your PC, they almost always have a mic input, and through the mixer in the audio control panel you can cause it to output the microphone to the speakers, which you would just replace with your RF adapter.
No. A piezo mic is a completely different animal. It needs no power and electrically is a capacitor. It produces a signal when it is flexed.No, not directly at least, microphone's don't output any signal without power going to them. Typical microphones are electret mics, AKA piezo microphones. They require 2-9 volts of DC current applied to them and a resistor to bias the built in FET amplifier.