wrote:
I have a bench supply that looks like this one:
http://electronickits.com/kit/complete/powe/HY3005D.jpg
I've seen numerous "brand names" on the same type.

The supply works normally unless the load draws more than a few
milliamps (say 100 or so), in which case it will drop into current-
limiting mode and remain there until I power cycle it, even if the
load is removed.

I suspect this is a pretty simple fix, but since there are so many
rebranded versions of this supply someone might have a schematic that
would speed things up a little. Any ideas? I think it just has 3-4 op
amps inside and a few power transistors.

I'm not sure I understand exactly how your supply works but my 25 year old
analog B&K power supply would shut down and indicate an over current
condition when there was none. It seems I was always pressing the reset
button. After some careful troubleshooting, I found that the front panel
current limiting control pot was intermittent. I cleaned it and now it as
good as new.

HTH.
--
David Farber
David Farber's Service Center
L.A., CA