Hello all:
I've been developing a device which includes a piezo element driven
differentially by two IO lines, no other components.  It works great and
draws very little power for so much sound.  Too easy, I wonder?  I've looked
over past PICLIST discussions of driving piezo elements with the PIC (and
have searched the web for other info as well to no avail), and have seen
mention of a series resistor, annd occasionally external protection diodes.
1. Can anyone give me a nutshell explanation of why these elements might be
neccessary?  I understand that there is an average current at the given
frequency, but is there also an instantaneous (or do I mean periodic?
inrush?) current and/or voltage which I must consider as well (and which is
dangerously higher)?
2. Can anyone recommend a source for additional reading to help reduce my
ignorance?
Thanks,

Bruce Cannon            Style Management Systems
bcannon@jps.net         http://www.jps.net/bcannon
(510) 787-6870          1228 Ceres ST Crockett CA 94525

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