> When the triac is enabled, where on the AC wave form will it turn on?

Wherever the waveform is when the triac is enabled.

> How about turning off, as I recall, the AC needs to cross zero for a
> triac to turn off?

The triac will stay on until the current drops to nearly 0.  In your
application, this is essentially at the zero crossings of the *current*
waveform.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.