I'm thinking of using a piezo through diode (I have Schottky diodes) to raise one side of a small capacitor in hope that it would drive enough charge into the FET gate to open it. The cap would shield the FET from the piezo spike. IF it could work, what ballpark capacitor would I be looking at? I …

Switching a TTL level FET with a capacitor.

GoForSmoke May 10, 2018, 6:41pm 6

If I connect one piezo lead to the FET gate, where do I connect the other lead?

What happens when I lift my finger and the piezo polarity reverses?

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