Using a piezo element as a contact mic

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If you want to record or amplify the sound vibraitons from a surface, you can use a piezo element as a contact mic.


However, do not hook them up directly to other audio equipment! There can be harmful high voltage spikes.

A simple and o.k. preamp to use is this one from collins lab

If both sound quality and equipment safety is not your greatest concern, a very simple solution is this one

If you want to hook it up directly to a speaker: