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DIY Piezo: Rochelle Salt Crystals

Submitted by dave on Sat, 19/05/2012 - 09:36

Leafcutter John has a great post about making Rochelle Salt, which is piezoelectric, and hence can be used as a contact mic: Real Sound Cookery.

My folks Peter and Judith are both crystallographers, so I thought I'd put them to work in the lab (kitchen) to make some nice crystals.

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Second generation Piezo Preamp boards on their way

Submitted by dave on Tue, 15/05/2012 - 14:20

Matt put this picture of the next round of Piezo Preamp boards up on his Flickr Stream. I've removed the piezo -ve input, and tied it to ground, which might loose 3dB of gain, but makes figuring out ground planes a lot easier. I couldn't hear the difference when I shorted piezo -ve to ground, and it makes the layout much smaller and easier.

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First set of piezo preamp boards

Submitted by dave on Mon, 09/04/2012 - 00:00

Got the first set of boards from Matt Venn for prototyping piezo preamps, and they're great! I've soldered both boards, after using the JFET matching described here (NOTE: link seems to be dead - I'll copy the circuit diagram from my notebook).

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