Re: [Xylo-SDR] RFC - Powers

[KD5NWA <kd5nwa@cox.net>]

How about a happy compromise, use the 4 pin connector like Phil suggest,
but put holes on the motherboard for two of them, you can put them in if
you want to, in case you need beefier ground and +12V.


At 10:44 AM 1/19/2006, you wrote:
> On 1/19/06, John Kolb
> <jlkolb@jlkolb.cts.com> wrote:
> >
> > If we are going to use a 4 pin connector with gnd, +5, +/-12V, lets
> use
> > something different than the 4 pin standard on PC power supplies
> to
> > prevent confusion. Maybe a 5 or 6 pin with 2 or 3 grounds.
> >
> > John  KK6IL
>
> John,
>
> The 4 pin connector on a PC power supply is:
>
> 1 - +12V
> 2 - GND
> 3 - GND
> 4 - +5V
>
> If we use the following pin out on our 4 pin connector:
>
> 1 - +12V
> 2 - -12V
> 3 - GND
> 4 - +5V
>
> then if someone plugged the 4 pin receptacle from the PC power
> supply
> into the motherboard power connector, they would be supplying ground
> (or 0 Volts) to the -12V input line which should cause no smoke.  As
> a
> matter of fact, if your project does not require the -12V then it
> would allow you to plug in the PC power supply without having to
> wire
> up a 4 pin receptacle to get the -12V.
>
> I like the 4 pin molex connector because it is cheap, abundant, and
> can be scrounged from many sources...
>
> 73 de Phil N8VB
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Cecil Bayona
KD5NWA
www.qrpradio.com

I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...