The quadrant thing refers to the gate sensitivity differences between the
"forward SCR with a positive trigger", the "forward SCR with a negative
trigger", the "reverse SCR with a positive trigger" and lastly the "reverse
SCR with a negative trigger". Some modes of operation are more sensitive
than others.
The RC network is to prevent, say a fast line spike ... from triggering the
triac "on" inadvertently. If I remember correctly, the triac has a small
internal capacitance between the gate and main terminal. And a fast rising
spike can be conducted through it ... to the gate
Curtis
Dazzle Mom this coming Mother's Day season with flowers!
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----- Original Message -----
From: Roy J. Tellason <rtellason@...>
in which magnitude should one expect the difference between the quadrants?
I guess the answer to that one would be on some data sheets. I don't
remember offhand, just that there were differences.
I did forget to add you will need a RC network across the triac to protect
it from possible high voltages.
That network is to prevent the device from triggering when the voltage
across it rises too rapidly, if I'm remembering right.
