But I don't know how to solder my piezo. Hope you guys can help me out.
All the piezo I have seen have a round ceramic center and an golden rim. The redwire (+) goes on the ceramic stuff and the black wire (-) goes on the golden rim.
My piezo have a ceramic center with a bowling pin shape cut out. This shape confuses me, I don't know where to solder the red wire.
Should it go on the bowling pin or on the other ceramic part.
(The piezo are 27mm.)
Did some tests with my multimeter set on 20V DC.
I got readings ranging from 1 to 5 volts from both ceramics parts.
BTW, does anyone know how to solder a wire to the rim?
I had a hard time getting my solder to stick to the rim.