R
Rich Grise
Gordon W wrote...
No, no, why don't you first try the second part of my advice, "keep
the load resistor small." That's a simple quick fix.
Maybe you can help me with a bit of brainlock here. If I put a CT, and
short the secondary, how does that reconcile with the idea of an ordinary
transformer with a shorted turn in the secondary? Is it just that the
current will be 1/N, and the voltage will be trivially small, based on
the resistance of the wire itself?
My only experience with a CT was when I built a 24VDC/120VAC, 1.2KVA
inverter from a "kit", following instructions exactly: "7 feet of
#24 teflon wire, wound on the toroid with about 7" left over for leads."
The thing was, there were two different cores in the "cores" drawer of
the parts bin, and I spent hours trying to figure out why the current
limit circuit wasn't getting activated - then finally, in exaxperation,
I wound another toroid, but with a _blue_ core, and it worked like a
charm. Apparently, the core characteristics have a _lot_ to do with it.
I've always been kind of afraid of things magnetic, but the guy I was
working for at the time designed his own ferroresonant transformers.
We'd be standing at the bench, looking at a new ferro design, and it
wasn't to spec, and he'd say stuff like, "Oh, let's just add a lam or
two" or "Hmmm - maybe use 14-lam shunts" or "Maybe a 15 uF ferro cap"
- in other words, Black Magic. ;-)
But we always got it, usually within only a few hours, and with those
exact #lams, #shunts, and cap, went right into production.
Spooky. ;-)
Thanks!
Rich