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Ok, this is weird. So I built a microphone amplifier using the circuit from here:


It works perfectly, except it picks up police radio? WTH is up with that? If you don’t believe me, I’ve recorded a conversation here:

Can anyone explain what’s going on? It seems like I only hear the radio if the microphone is attached. And the microphone wire is acting like an antenna, since the audio quality changes if I move it around.


Ah I see…

It must be some coincidence that it was tuned to the police frequency… I thought the police used more sophisticated radios, I guess not.

Thanks for the info!