No problem, I thought; I cut the little wires and soldered my hot lead to one of the little solder blobs left over from the circuit board.
Tap-test was fine. Stuck it in the box and waited for the glue to dry. No sound. Fortunately, I hadn't glued the lid....
Popped the strings off and took a look; the hot lead had pulled off completely. Further, when I tried to re-solder it wouldn't stick at all. Seems there's a thin layer of some sort of conductive material on these and it must be very fragile.
RS says they'll get in my regular piezos tomorrow.
Also... I took a rather large piezo out of a smoke detector. This is about 1 1/4" in diameter. the backing appears to be stainless steel. These are not soldered; the connections in the smoke detector are springs.
Anyway, I tried to solder one of these up and could not get the solder to stick at all. Even roughed up the surface by scraping....Nothing.
Anybody ever use one of these?
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Check out my tips for soldering wires to piezos at the end of this topic:
http://www.cigarboxnation.com/forum/topics/2592684:Topic:107249?com...