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.

Very fast, especially from the point of view of the lamp. Fast enough
to cause significant amounts of EMI.

Specific numbers would require actual part numbers.

Look at (for instance)
http://rocky.digikey.com/WebLib/Teccor/Web Data/Q4006LTH (E3).pdf
which also includes a diac trigger.

When their trigger terminal is 35 or so volts different (in either
direction) from the MT1 terminal, they turn on. Their turn-on time is
on the order of 3 usec.

When the current through them drops below 40-70mA, they turn off.

> 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. ; )


--
Ned Konz
http://bike-nomad.com
GPG key ID: BEEA7EFE

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