On Wed, 14 Apr 2004 22:59:36 -0000, manifold <manifold_1@...> wrote:
You're right, A DC voltage applied to the gate will allow the TRIAC to
conduct in both directions as long as the applied voltage gets over
the threshold voltage. I guess I have just never used one like that
and did not think through the analogous SCR circuit well enough (duh).
That would mean that the output would always have a notch out of the
of the applied voltage waveform and that notch height would be equal
to the threshold voltage. The notch location would be determined by
the value of the DC gate voltage up the limit of 10V.
Is that right?
dunno...
will have to actually try it when i need it.
i thought a scr is current triggered, not voltage triggered, is that right?
If you think it through with two seperate SCRs it looks like it will not work
but a triac is not exactly only 2 scrs, like a bipolar transistor is not only two diodes.
It might just be that with the opposite polarity of the trigger pulse the other PN junction
might be used, which would mean with DC trigger always the same junction is used to trigger,
no matter which direction the main current is...
not sure myself...
ST
