23 Dec
2010
23 Dec
'10
4:05 p.m.
> From: toby at pdp11.co.uk
I've recently acquired a Variac (220V 10A) and was
wondering what the
collectives views are on using them to revive long dormant power supplies.
Previously I have removed the electrolytics and reformed them with a bench
power supply setup, slowly ramping up the voltage (as per
http://www.vcomp.co.uk/tech_tips/reform_caps/reform_caps.htm). Am I right in
thinking I can use the Variac to effectively reform the capacitors in
circuit?
I'm currently rebuilding one of my PDP-8/E's which has a linear PSU which I
believe is ok, but will it also work with later DEC switchmode PSUs?
All the best,
Toby
Hi
Don't use it on switchers. It is sure to either cause a failure
or for those that have brown-out feathers to not work
as expected.
If you want to bring up capacitors for switchers, remove
them from supply and use bench supply with a limiting resistor.
This is the better way, even for a linear supply.
Tinker Dwight