Actually, I am looking for a multi-channel device. Triacs have worked
fine for me in the past, except when they are abused. Ideally, I would
like to find a 4 channel AC driver with fault (open circuit, short)
detection. I have seen similar devices for driving dc devices (targeted
towards auto industry), but nothing for AC.
Roger Morella
-----Original Message-----
Declan Moriarty
Sent: Saturday, February 07, 2004 12:09 PM
To: Multiple recipients of list CHIPDIR-L
On Sat, Feb 07, 2004 at 03:44:20AM -0800, Bob Paddock enlightened us
thusly
>
> > You are asking us if transistors are triacs :-O.
>
> Some nice Field Effect Transistors are good triacs, when used
> back-to-back/end-to-end if you prefer. :-)
>
> Personally I've never meet a triac I like, and refuse to use them.
> Bad experiance from my first job assignment years ago. Boss Man said
> "figure out why this design of mine DLFJK:J up some times". Then you
> have to tell the Boss Man the first day on the job it is because he
> didn't know what he was doing...
>
> Anyway use inverse parallel SCR's. You end up with the same triac
> function but with orders of magnitude dV/dT immunity improvement.
>
>
Thank you for sharing your pain with us. I also detest triacs; I was
answering the man's question, however. You would not drive AC with a
transistor. Use relays, ssrs, triacs, or scrs - not transistors for AC
solenoids.
Also beware of a heavy inrush current on AC solenoids when they are
energised.
--
With best Regards,
Declan Moriarty.
--
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Author: Roger Morella
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