>>
>> By the way, can anybody direct me to a good optically isolated
>> zero-crossing detector circuit?
>> I know it must be really simple, but probably there is already a well
>> known circuit? Somehow google search did not help much.
>
> Why bother with detecting zero-crossing point at all? =A0Most AC control =
systems
> use triac to switch the load, just use a triac driver with zero-cross det=
ection
> built in, something like MOC3043 or similar. =A0Search mouser.com for "ze=
ro
> crossing". Then, on the PIC side, it becomes regular PWM with long period=
..
>
> Sergey Dryga
> http://beaglerobotics.com

I have done this with U2008B chip, for controlling a heater, and it works f=
ine.
I am not sure if I want to do that way for motor control, seems like
MCU would be missing a lot of control over situation. Those
controllers do not provide proportional drive.

--=20
KPL

--=20
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