Driving Triac Directly with 555 Output?

You won't get both sides of the wave with a simple direct hook up like that. Current must flow in both directions with the polarity of the AC.. This is one reason why optical are used and those that like to use OP-Triac's to drive the larger triac. The OP-Triac can get pulsed on with a single ended source, the 555. And the internal emitter will forward bias both photo's at the same time but only one will fire depending on the polarity.

Jamie

Have you never heard of FOUR QUADRANT triacs?

"Jamie"

Never come across one that did not.

F*ck you - asshole.

..... Phil

Sure I have, made a few nice little trinkets with them.

Still does not change any reasoning for what I said.

If you are able to fully absorb what the circuit is that its being implemented in, you may then understand how I think...

On top of that, it's most likely a 4Q isn't being used and if it was, it wouldn't make any difference in this case.

Maybe you've never heard of Latchup issues in Triacs.

Jamie

Ha, you make me laugh Phil. I've done so much work with SCR's and Triacs in various applications, I don't even know where to start..

To coin one of your phrase;

"Piss off! you autistic piss of s*it"

Jamie