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 see Piezos as capacitors you can charge by squeezing, discharge by releasing.
I have put piezos through diodes into bjt's and that worked but this could be cooler and I have bags of 10 cent piezo discs.