Zero Crossing Detection

[James Jackson]

Hi all - A bit off topic, but here goes -
        I need to find out where I can get a schematic for a zero crossing
detector that works with UK Mains voltages as an input. The voltage has an
r.m.s. of 220-240v, and is at 50-60Hz. I just need a pulse output at logic
levels each time the voltage crosses zero. This should make a pulsed output
of 100Hz (correct me if I'm wrong). I know I could use a multivibrator, but
I need the pulse to be in time with the mains supply of my device I'm making.

Thanks,
James Jackson.
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James Jackson - New Era Web Designs
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