EricaS
Member level 3
![Member level 3](/styles/images/ranks/dlevel3.gif)
Hello
Is it possible for a pizeobuzzer ringer to emit audio as RF?
Here are some pics of the buzzer. (Black object).
Someone once had this to say:
"I have no direct experience but a change in the position of the diaphragm will certainly change the impedance of the coil which will affect both its Q and resonant frequency. A nearby transmitter may well have a detectable audio modulation of its frequency or power. That is after all how a metal detector works!"
Is it possible for a pizeobuzzer ringer to emit audio as RF?
Here are some pics of the buzzer. (Black object).
![IMG_20150331_154704.jpg IMG_20150331_154704.jpg](https://www.edaboard.com/data/attachments/52/52913-d8118e5e6d22dae736912179e55c411c.jpg)
![IMG_20150331_155654.jpg IMG_20150331_155654.jpg](https://www.edaboard.com/data/attachments/52/52912-7e40230d3dae3b9d43242eb9a5321d2d.jpg)
Someone once had this to say:
"I have no direct experience but a change in the position of the diaphragm will certainly change the impedance of the coil which will affect both its Q and resonant frequency. A nearby transmitter may well have a detectable audio modulation of its frequency or power. That is after all how a metal detector works!"
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