18 Jun
2009
18 Jun
'09
2:34 p.m.
On Jun 18, 2009, at 1:58 PM, Tony Duell wrote:
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!!
-Dave
--
Dave McGuire
Port Charlotte, FL
But I don't lioke changing the classic machine.
Not even replacing
PSUs
with switchers. The original PSU is part of the design, and I
want to
keep it that way.
While I agree with you here, I have to admit that, if my PDP-11/70
had switching power supplies, I'd probably run it a lot more often.