19 Apr
2005
19 Apr
'05
10:52 a.m.
Hi
He might check out the circuit breaker. These
are know to go bad, especially if they are used
often as a switch or have been tripped often.
Unless there is a soft start circuit, it is
unlikely that the filter capacitor would trip
the breaker but otherwise continue to work after
the power came up normally.
Dwight
From: "Wai-Sun Chia" <waisun.chia at
gmail.com>
On 4/19/05, Steven_R_Hutchins at raytheon.com
<Steven_R_Hutchins at raytheon.com> wrote:
I am considering using two modern +5v at 25A switching power supplies to
replace the +5V source ( leaving the original -5V at 2A,+15 at 2A,-15 at 2A,and
+20 at 4A as original) in a PDP-8A.
My intent is to increase the reliability of the system. I have had trouble
with keeping the G8018's operating. I occasionally trip the breakers on
startup. I am thinking bad filter Caps. Perhaps someone could give some
opinions on this (Crazy) idea.
Hmm....here's a crazy thought..
What about...replacing the filter caps? :-)
Or troubleshooting the PSU?
A PDP8 with a SMPS to me is total heresy.
Where do you stop?
One of the tenets in classic computing (to me anyway) is to retain
originality as far as possible or as much as your funding/SO permits..
:-)
/wai-sun