🚀 go-pugleaf

In article <1993Jan2.172332.21070@socrates.umd.edu> jimbo@socrates.umd.edu (Jim Bogard) writes:
>What's the best way to detect the presence/lack of a square wave?


You can use a classic "missing pulse" detector. Basically it is a
retriggerable monostable multivibrator (one-shot) whose timeout is
slightly longer than the longest period expected in the square wave.
Basically, the square wave keeps the timer constantly triggered, so the
output is stable. When the pulse isn't there, the output changes and
you can detect that.

I've seen these made with the good ol' NE555.

>-- 
>Jim Bogard  (jimbo@socrates.umd.edu)
>                                            "Implement now, tweak later."
>Tech at large / gigging daemon
>

		Steven Christensen
		(I didn't spend 5 years at an engineering college
		for nuttin'! )
-- 
Steven V. Christensen
schriste@uceng.uc.edu