/diy/ - Do It Yourself

Henlo gamers, piezo contact mic guy from a few threads ago. I built the first mic, and it works. Here's a test in which I pressed the mic against my desk with my index finger while turning the gain dial up slowly - the constant hum is my USB desk fan, the intermittent scratching is the potentiometer turning, and right near the end the super low thumping is my pulse, picked up through my finger: https://vocaroo.com/1nrwsGcbl533
Not really sure what to do about the output level. Theoretically the mic can output 36V signals, which is a far cry from the 1.734V of line level, and from the 100mV of mic level. I think it should be fine, because whatever it's plugged into should* just clip the signal, but it's got me a bit noided. Any thoughts?

I know the flux is ugly. I want to clean it, but IPA won't touch it and I don't have MG Chem's proprietary flux cleaner. It's non-corrosive at least. Also, the recording was with the case closed. With the case open, as pictured, interference is an issue. The inside of the case, except for the top and bottom plates, is coated with the conductive paint I've been developing, mentioned a thread or two back. Works well.