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

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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NdolaM
NdolaM

5 years 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.

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NdolaM
NdolaM

5 years 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.

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iceng
iceng

7 years ago

Try the 2N2222 version.

A

3t piezzo.gif
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Josehf Murchison
Josehf Murchison

Answer 7 years ago

Great for getting a teenager out of bead in the morning.

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Josehf Murchison
Josehf Murchison

7 years ago

Needs a oscillator to M (main) and G(ground)
F (feedback) is for a feedback oscillator.