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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.
Comments
1 year ago
The easiest oscillator is either to use the one that drove the piezo transducer in donor device (as sort of shown here) or use a hex buffer chip and a few caps and resistors
https://www.youtube.com/watch?v=9dvOrSD1AKI
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.
Answer 5 years 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...
https://www.instructables.com/id/How-to-make-an-Ard...
http://www.electronics-tutorials.ws/io/io_8.html
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.
7 years ago
Try the 2N2222 version.
A
Answer 7 years ago
Great for getting a teenager out of bead in the morning.
7 years ago
Needs a oscillator to M (main) and G(ground)
F (feedback) is for a feedback oscillator.