> The MOC3041 is a ZC opto-triac, so if you're using an opto
> anyway there's no added complication to the design

Yes, I'm using MOC3062 which kas ZC detecting, but controller has to
know when to instruct a optocoupler to open. Otherwise it will not be
in sync. Am I wrong?

> Cheap 4-pin opto-transistors can be used as ZC detectors too,
> to detect one or both of the cycle peaks
>
> http://home.clear.net.nz/pages/joecolquitt/txless.html
>
> with a little s/w to get the actual timing spot on
>
> Joe


I do not like these circuits, since you get a serious heat source, in
that 100K resistor. There was a work-around circuit, described here:
http://www.edn-europe.com/improvedoptocouplercircuitsreducecurrentdrawresis=
tledaging+article+2021+Europe.html

--=20
KPL
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