Homer J Simpson schrieb:

"Reinhard Zwirner" wrote in message
...

Hmm. As to my experience the triacs's gate normally is sensitive enough
to get the triac triggered by two zeners. BTDT: 24 V halogen lamp
controlled by a triac triggered by a "two-5.6-V-zener-diac".

But how does the zener help?

If we talk about two back-to-back zeners: to provide a defined, constant
threshold at which the triac becomes triggered.

On the other hand: for me it's just a quick and dirty solution for
replacing a faulty diac if there's no original replacement at hand.

Bye

Reinhard