19 Jun
2009
19 Jun
'09
11:59 a.m.
Whatever have
you done to it? AFAIK the 11/70 has switching
regulators as
standard (my 11/45 certainly does). Not the normal design of SMPSU (in
that there's a big mains-frequency trasnformer on the input), but
it's a
switcher none-the-less.
Yes...Huge transformer, big bridge rectifiers, LM723, big series
pass transistors...that says "linear" to me. :) I've never gotten
deeply enough into the circuit I guess. I've been
a DEChead all my
life, but still I learn something new from you guys every day!!
I had to understand the cirucit after one of my -15V regulators almost
literally exploded when I was debugging it. I made the silly mistake of
disabling the overcurrent trip (lifted the collector of the sense
transsitor), not realising the crowbar was firing. The result was
transistors blown apart, a dead 723 -- and a blown fuse. Yes, I did get
it going again (and even found out why the crowbar was firing).
-tony