Electronics > Projects, Designs, and Technical Stuff

Piezo Sounders - mounting under a decal?

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JVR:

--- Quote from: Simon on January 11, 2019, 11:47:10 am ---but are you talking the type of decal that has buttons and OLED lights in it? they are not too expensive but there is tooling.

--- End quote ---
Jip, called membranes, like so:



--- Quote from: Psi on January 11, 2019, 12:21:59 pm ---It's notoriously difficult to model the behavior of a mounted piezo.
Often the math says X should be loud but in reality it's not.
And a random mounting idea turns out to be amazing.
--- End quote ---
Seconded. We did all of the math, in the end we autotuned them by feeding a dB meter back to the MCU while it stepped frequencies. Driver was a JRC part IIRC.

Berni:
Yes as PSi said. How you drive a piezzo makes a massive difference in output power. They love big sharp AC voltage swings.

A quick hack for driving one can be a RS232 driver chip. They generate the voltage and provide a fairly low impedance AC drive to it all in one chip.

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