Help with circuit - Page 2 - Electronic Circuits Projects Diagrams Free

kchriste · 18th August 2008, 02:27 AM

Well, you made be do it.

I dug out a couple of piezo elements I had lying around. One of them is in a housing like the one in the OP but PC mount. It produced about 1Vpk-pk when I blew in the hole. The other one I found was "naked" and produced around 10Vpk when lightly tapped with my finger. So your intuition is right; it'll take a pretty loud noise to trigger the SCR, but mweels did seem to want to detect loud sounds:

Quote:

Originally Posted by mweels

a microphone picks up a sound from an event (balloon popping, firecracker, etc),

A multiturn POT would make it much easier to adjust the sensitivity.

Mikebits · 18th August 2008, 06:01 AM

Quote:

Originally Posted by kchriste

Well, you made be do it.

I dug out a couple of piezo elements I had lying around. One of them is in a housing like the one in the OP but PC mount. It produced about 1Vpk-pk when I blew in the hole. The other one I found was "naked" and produced around 10Vpk when lightly tapped with my finger. So your intuition is right; it'll take a pretty loud noise to trigger the SCR, but mweels did seem to want to detect loud sounds:

A multiturn POT would make it much easier to adjust the sensitivity.

Thanks for putting in the effort. I imagine your test were the piezo into a 1 Meg scope probe, so into the base of a transistor were looking at small volts.

At this point, I think the OP has abandoned this post, so at the very least I learned something. Thanks

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