Re: Reusing ProFile PSU for an IDEfile

On Wednesday, September 3, 2014 11:21:58 PM UTC-4, Tom Stepleton wrote:
>
> Hi there,
>
> I've got a ProFile that's been dead for many years. I'm also (finally)
> getting back to assembling my IDEfile, and it seems to me like using the
> old ProFile case would be the best way to ensure a "classic" look.
> Additionally, there's that nice beefy ProFile power supply which should be
> more than enough to power the IDEfile and the little compact flash card I
> plan to use as the drive.
>
> Just now, though, I went and tested the voltages on the ProFile PSU lines
> with a cheap, crappy voltmeter. What I'm getting is (roughly):
>
> Red wire->black wire (either one): +6.4v
> Blue wire (either one) -> black wire (either one): +16v
> Purple wire -> black wire (either one): -16v.
>
> I was expecting +5, +12, and -12 respectively. My meter is cheap, but it's
> not usually that far off. Is something wrong with the power supply or is
> this arrangement normal?
>

Apparently, ProFile power supplies are notorious for very high output voltage under no-load conditions. The X-Profile folks, for example, warn stringently against connecting their disk emulator directly to the supply. They sell a little regulator board for this purpose.  

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