ATTENTION HARDWARE GURUS (was Re: Freakin' Second Sight Board)

[Paul Schultz <pschultz@med.wayne.edu>]

Well, I thought all was well after I changed my power supply's
+5, +12, and GND leads to 16 guage stranded wire. It did seem
to reduce the "line noise" and allow me to use my SecondSight
card.

But, after 30 - 60 minutes my computer crashes. So, I pulled
out my voltmeter and did some investigating.....

=========== OBSERVATION #1: VOLTAGE DRIFTS UPWARD ON MY +5V LINE!

Apparently, my +5V line now drifts slowly higher after powering
up. This occurs at the motherboard plug so it doesn't look like
a problem within the motherboard circuitry.

EXAMPLE: On powering up, my +5V line reads 5.01V at slot 4. It
slowly creaps up to 5.22V over about 30 minutes at which point
my IIgs crashes.

What could be the problem? Any hardware gurus out there?

=========== OBSERVATION #2: VGA MONITOR CAUSES VOLTAGE ACROSS +5V LINE!!

While doing my testing I noticed a peculiar phenomenon which I
was hoping someone might be able to explain....

After powering down my IIgs power supply, I noticed that I still
had about 0.18V reading on my +5V line!! It turned out my VGA
monitor (hooked up to my SecondSight) which was still powered up
was causing it!! Is there some sort of "VGA" explanation for this? :-)
Or, is this indicative of a problem with my monitor as well?



Any ideas on what I might try to remedy the +5V drift problem? I think
I'm close to getting everything working on my IIgs (read: SecondSight)
if I can just conquer this last problem!!

Thanks in advance!

Paul.
pschultz@med.wayne.edu
Paul Schultz