DIY piezo preamp with hi-pass filter

In my¬†post about cymbals reverb with the help of piezo mics, I explained the technique of using a piezo transducer (also called contact mic) in order to get beautiful, musical stereo reverbs from drum cymbals. I showed the DIY ilski PB-1 (“PiezoBanana-1”) preamp, which I will explain thoroughly in this post.
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