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How do I wire a three-terminal piezo buzzer to make it sound?

I salvaged a piezo sounder from a CO detector.  The sounder (EFM-290ED rated at 9V) has 3 pins rather than the two I am more familiar with.  The pins are labled G, F, and M.  I have tired applying 9V across all combinations of the pins but haven't had any luck maiking it sound.

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NdolaM5 months ago

I see your circuit says 9-20V. The test circuit uses 9V. With your circuit and 9V I'm getting very litttle sound (60 or 65 dB as a wild guess). Can you comment on how much volume you get with 9V? Thanks.

iceng NdolaM5 months ago

Though not the initial question. A strong volume comes from the resonating chamber where the piezo is held in place

http://www.thepositiverail.com/blog/how-loud-can-i...

http://www.instructables.com/id/How-to-make-an-Ard...

http://www.electronics-tutorials.ws/io/io_8.html

NdolaM5 months ago

(I realize this is an old discussion, but in case you are still reading...)

I just tried 18V. Louder, but not enough to wake a teenager. Maybe my EFM-290ED is damaged.

iceng3 years ago
Try the 2N2222 version.

A
3t piezzo.gif
Great for getting a teenager out of bead in the morning.
Needs a oscillator to M (main) and G(ground)
F (feedback) is for a feedback oscillator.