If the sound transducer is what you want, you can buy them from Digikey. The CEB-20D64 is one of the smallest one they carry. There may be smaller ones inside resonator packaged units, if you want to dissect something.
Been trying for months to find a watch beeper. NOT A WATCH WITH A BEEPER IN IT! All I want are the parts or even the circuit that beeps. I've looked at every electronics supplier on the internet and none of them carry anything anywhere near as small as what I'm looking for. Anyone have a clue where to get these tiny parts?
These buzzers consist of a piezo element ( a wafer of ceramc material that bends when voltage is applied), possibly a resonator (not used when the case of the watch is made to vibrate directly from the bending) anda signal source. Sometimes the signa lsource is an oscillator and sometimes it is an amplifier hooked up to the piezo with a positive feedback connection that makes the amplifier produce the resonant frequency of the bender. In a watch, the signal is uaually generated by a digital frequency dovider based on the quartz crystal that is the time base for the watch.
If you disect one of these resonator packages, you should find the amplifier on a tiny circuit board and a small circular wafer of Piezo material that is metalized and connected to the driver. If you are able to remove the contents from the resonator, you might be able to cement the bender onto some surface (like the back of a watch case).
Sorry. The unit I mentioned is just a bare piezo bender in a resonator case. It requires an external driver. Digikey part # 102-1115 is an example that includes the drive oscillator (so can run directly off DC).
What you're looking for is called a piezoelectric "bender" or "bimorph". Google will get you lots of hits.
-- John Fields Professional Circuit Designer
BEEPER IN
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anything
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Go to the drugstore or Walmart and get watches for $9.95 apiece and take the beeper out and throw the rest in your junque box. :-)
GOod Luck! Rich
If it will really be that large of quantities, ask a watchmaker where they get theirs, and/or if they'd like to sell some.
Good Luck! Rich
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