Which contact to use on 3 contact piezos?

I got some different sizes piezo discs to experiment with, but there's one size that has 2 zones on the ceramic plate on top. I found out that they are called 3 contact piezos. Where do i solder my hot lead? The big surface or the small bit?

 

Thanks in advance!

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Permalink Reply by Dan Sleep on February 24, 2011 at 12:41pm
Beats me, I have only seen ones with 2 wires. Hook up some small alligator clips and test it out first.
Permalink Reply by David L. on February 24, 2011 at 1:21pm

Hi,

 

It is a Self Oscillating piezo (used for sirens I think - if you google self oscillating piezo you can check out a datasheet if you want more info) it will work like a normal piezo pickup - wire one earth/ground wire to the metal base and two hots one to each of the two white bits on top.

 

David

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