Comments on: Whistle to beep circuit

By: Val

Val — Tue, 15 Nov 2011 11:32:27 +0000

Hi, nice idea using just one dig. IC. How does the pass filter work around of U1B, please? I have never saw this kind of solution. Many thanks!

harry — Fri, 23 Apr 2010 13:51:00 +0000

can i get more details on this?

lekshmi — Mon, 22 Feb 2010 05:52:47 +0000

please send us the operation about “whistle responder”.Please tel us about what kind of whistle we should use and of how much frequency.

Arnie Nutini — Wed, 16 Dec 2009 03:23:28 +0000

I;m sorry if I put this in the wrong place. Don’t know where I should post something like this.
Thanks again, ARNIE

Arnie Nutini — Wed, 16 Dec 2009 03:17:56 +0000

I need a circuit for a ribbiting Garden Frog motion detector. It has an LDR, COB,3v, Mounted on a pcb with speaker.
Thanks, ARNIE

sanjay — Mon, 24 Aug 2009 12:02:35 +0000

sir can you tell me where i can get um66 pcb circuit??

please reply fast i really need your help