RE: [OT]? Lighting Controllers>You don't actually need to use an
optoisolator, there have been several dimmer circuits >that have run
directly from the mains with no isolation at all. The mains voltage is >fed
directly to a PIC input via a current limiting resistor to detect zero
crossing >points.  However, if the dimmer is going to be wired to someones
PC for control then >obviously this little scheme has it's drawbacks.  (like
electrocution).

    While we're off topic, I want to make good use of the opportunity and
ask how all this "zero crossing" thing works, for what is this for and
examples of detection circuits.

    Thanks for all,

    Brusque
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