Re: Trigger signal generator

Am Tue, 30 Aug 2005 15:09:44 +0200 schrieb CWatters <colin.watters@xxxxxxxxxxxxx>:


"Alexander Frey" <axfrey@xxxxxx> wrote in message
news:op.sv9ysqwt4a9cpy@xxxxxxxxxxxxxxxxxxxxxxx

Hi all.

I want to synchronize a laser pulse with an AC current (only about 1kHz)
source that unfortunately doesn't have a sync output. For the laser pulse
I need a good trigger signal, which up to now I have generated with an
oscilloscope that has a trigger output. But this signal is not very good,
probably it's 'cause the scope is not the best one.

So my question is, how do I generate a good trigger signal from a sine
signal with an amplitude about 10V-50V? It seems a pretty simple task, but
up to now I haven't found any device that does this job. 

Use a Comparator to convert it to a square wave. Set one input to 0V and
feed the sinewave in on the other. Give the comparator just enough
hysterysis to make it immune to any any noise on the sinewave.
http://home.cogeco.ca/~rpaisley4/Comparators.html

Thanks, I'll try this one.
It seemed to me that this was a pretty simple and common task and I just thought that there should be plenty of little gadgets out there that do this job.

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