As I tried to imply, I thought I would take a last shot to try to find the
"exact" match. Seemed to me, someone once suggested that these units were
still selling over in the UK. Failing that, I would have to redesign this
thing to work another way. The ideas submitted are great and well... it's
off to the parts bins to see what I can scare up. My luck, everything but
what I need.

Thanks again for all replies. It is appreciated.

Lou


"Michael Black" wrote in message
...
"Lou" ) writes:
I've been looking for a 4 pin voltage regulator. I have a particular
number
in mind (uA78HG), but so far as I know, they're not in production
anymore.
I've looked in a couple places on line for a 4 pin job, with no luck.
Since
the one I "need" seems to be gone for good, right now I'm willing to use
any
12 vdc - 15 vdc 1 Amp or more voltage regulator to get my power supply
going
to any extent - rather than leaving it collect dust or tearing it apart.

Failing finding a VR of my needs, I guess I'll have to redesign this
thing
to work some other way. I thought a last minute search may produce
something
to make life easier. Any ideas? With all the crap I have here, I could
build
a few power supplies (probably). But never ever - do I have the part "I"
need.

Lou



But they were never popular. Occasionally, there'd be an article in the
hobby
and/or ham magazines about them, but they rarely made it into published
construction articles. Sure, that doesn't reflect whether or not
something
is used commercially, but it does suggest that there was something about
them that never caught on.

The question to ask is why you need the four terminal regulators.
What is it that makes you want to use one instead of a three terminal
regulator? The LM317 (and 337 for negative voltages) is a variable
three terminal regulator, and far more common, not just now but
forever. Not enough current (though I didn't think the 4 terminal
regulators were particular better than the average 3 terminal regulator
in that regard)? Then pick a regulator that does have better than
usual current. You could find them years ago, though not so commonly,
and I can't think why they wouldn't be around still. Or use an
external transistor to boost current. Or there is something verys
specific about the four-terminal regulator that you need, but in order
to come up with a workaround, you need to be specific of the need.

If you just need a regulator, virtually anything will fit in there,
and you just wire it properly and ignore the fourth terminal.

Michael VE2BVW