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#1 (**permalink**) 11-03-2007, 07:22 PM

Hi,
I need to detect a presence of square wave. If square wave is there I
need to generate a logic 0 and this square wave is not present I need
to generate logic 1 or vise versa. Can you suggest me a circuit for
this functionality.

Thanks in advance

Regards
Pinku

#2 (**permalink**) 11-04-2007, 01:29 AM

There are numerous ccts that would do this from a retriggerable
monostable to a comparator with feedback.

www.ckp-railways.talktalk.net/pcbcad28.htm

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