there are some great TRIAC tutorials on the teccor web site, on ST's web
site, as well as other manufactures of TRIAC's.  Most TRIAC's are 3 quadrant
devices.  Teccor also has sensitive gate TRIAC's that can be triggered
directly from I/O's of some microcontrollers, using an inexpensive diac vs.
opto isolator.




On Thursday 24 April 2003 08:13 am, John Pearson wrote:
> How fast are generic Radio Shack triacs for switching 110v 60Hz
> current to...say...a 150Watt incandecsent light bulb.


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

You don't "enable" a triac, you turn it on. And it turns on within a
very short time (a few usec) of turning on the trigger current.

> How about turning off, as I recall, the AC needs to cross zero for
> a triac to turn off?
>
> Thanks for any help. I am in a real pickle here. Got caught BSing
> on a forum and need to do some damage control. ; )


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