Re: Inductor arrangement for boosting low-voltage piezo drive

Don Baker wrote: 
I measured a CUI  (www,cui.com) model CEP-1136 at 79db at 3.0 volts with a
measured current of 7.7ma.  I have this device in a medical instrument and
have been very happy with the low voltage performance.


Don,

Thanks, that looks like it would suit well - almost too big, but
I think it'll fit my chosen case. If it's really that loud I can
dispense with extra drive (for which I think the '232 chips would
have been best). Did you tune the frequency, or just use close to
the typical resonance?

A question about these self-drive piezo's - it looks to me as
though they could be easily switched by leaving power connected
and controlling the base drive (220K resister in the recommended
drive circuit). Will the piezo suffer from having 3V across it
forever? I suspect not, and that way my micro only has to switch
uA. Not that 8mA would be a problem, except perhaps for EMI.

Clifford.
.

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