sound detecting circuit

[manz]

hi there...

does anyone know/have a circuit to detect sound. i would define sound as in for the finger snapping (i dont know what it`s actually called) or maybe clapping.

just a simple circuit would be ok, that is to trigger a relay or so when it detected that sound.

thanks a lot.

 

[stevez]

The detector you describe might be a microphone and an amplifier. It seems a common microphone element is the electret mic - Radio Shack used to sell them at low cost. An speaker can work as an amplifier. I know many of the Radio Shack and other introductory circuits books have nice, simple circuits for this - from relatively common parts. Sorry I don't have links but a quick google on audio amplifier ought to produce some results.

 

[manz]

thanks,i`ll try work it out

 

[AllVol]

The attached schematic might work for you.

AllVol

 

[stevez]

I just read my own response from yesterday. I said "a speaker can work as an amplifier". I should have said a speaker can work as a microphone.

 

[mramos1]

Clapper circuit:
**broken link removed**

Or search this website/forums for "clapper circuit". There are a lot of them out there. AllVol gave you the start to make your own from scratch.

 

[manz]

okay i`ll have a look.thanks.