Pulsing LED to Audio using a 2N2222 transistor.

harps · May 2, 2010

its a cebek pm-11 voice activation relay

**broken link removed**

but its relay release time is very slow. :/

lots of other interesting modules on that site too.

mneary · May 2, 2010

Could you photograph the underside of the board? If you're using a fixed focus cam e.g. a phone, improve the focus with a lens from reading glasses.

12345678901234567890 · May 2, 2010

skinind95 said:
After a little bit of messing with it, i've added a 10k resistor between the positive and negative audio input lines. I'm not sure why, but this fixed it and now the circuit works exactly how it should. ..one day i hope to understand why. =)

Here is the current schematic for the working circuit:
**broken link removed**

Thank you all for your help!

Since this thread is being brought back up again, here is a quick and very primitive sound to led light circuit for a build if anyone is interested.

It works in a very simple way, but it works.

Pulsing LED to Audio using a 2N2222 transistor.

harps

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mneary

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Pulsing LED to Audio using a 2N2222 transistor.

harps

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