[mdlug] Old 386 needed - Power Supply

[Raymond McLaughlin]

Jay Nugent wrote:
> Greetings Ray,
> 
> On Tue, 21 Apr 2009, Raymond McLaughlin wrote:
> 
>> Jay Nugent wrote:
>>> Greetings,
> 
>     ...snip...
> 
>> Thank you Aaron and Jay,
>>
>> I have been, and continue to mull a more detailed reply, but will here
>> quickly point out that I have, on hand, several serviceable AT and ATX
>> powers supplies. Each of these provide both a +12 (yellow) and a -12
>> (blue) output. Shouldn't this look like 24v to any DC device connected
>> to it? 
> 
>    CAUTION.  The +12 and -12 are referenced to the ground lead -- and this
> is oftentimes directly connected to the chassis of the power supply as
> well as the motherboard.  Sound ground *MUST* be isolated between the
> power supply and the PC/laptop if you expect this to work.  Never the two
> shall meet :(