barton@latcs1.oz.au (The Wasp) (10/13/90)
I've designed a linear regulator to provide me with 0 to 100V (actually
it's much more general - it'll regulate anything I put into it), but it's
_only_ a positive regulator. I'm designing a power supply around it, and I
want a 0-100V and -100-0V (common earth) with INDEPENDENTLY variable output
levels, so:
control 1 control 2
| | |
O E O
-100 to 0V 0 to 100V
wrt E wrt E
My problem is that while I can regulate the positive side, I can't use my
design to regulate the negative side. If I use the same design for both sides,
but invert the negative side (ie multiply it by -1), I'll achieve my goal,
but I don't know how to do this. Does anyone else? (Obviously op-amps are
no good, since they're usually only good up to about 18V.)
Please email replies, as I don't often read this group.
Thanks in advance,
Doug