Am Tue, 30 Aug 2005 12:13:23 +0200 schrieb Jasen Betts
:

In article , Alexander Frey
wrote:
Hi all.

I want to synchronize a laser pulse with an AC current (only about 1kHz)

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.

first off which part othe wave do you want to trigger on.
the crest (maximum voltage), zero crossing (when the voltage changes from
positive to negative), or some other point.

Actually, I need the trigger signal to drive a digital delay generator
that himself makes a trigger pulse with a variable phase to the AC. With
this pulse the laser is fired, so that I can adjust the time the laser
fires on a sample with respect to a current flowing through the sample.
So it really doesn't matter on which point of the sine wave I trigger,
because i can reach every phase position with the delay generator. But the
best point o trigger on would probably be one on the rising/falling slope,
rather than the tip of the wave I guess. As I said in another post I'll
try the Schmitt trigger curcuit.

good quality solder, and a clean soldering iron will always help
stay away from plumbers solder

something can probably be done with an op-amp chip and a few other parts.

Oops, I just ordered two hundred pounds of plumbers solder on ebay because
it was less expensive than the other type. Was that a bad idea?

Thanks folks,
Alex

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