On 16.5.16 09:36, DaveC wrote:
http://imgur.com/Trvs5mk

This is a beeper piezo in a Fluke 117 DMM which quite beeping. Scoped the
piezos pads and... nothing.

An inverter (from the CD4069) is connected across the piezo. Guess I dont
understand anything about driving piezos.

Is this a standard practice?
Cheers.


You'll get AC drive when you drive one side with a logic signal
and the other side with the same signal inverted.

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-TV