[sebhc] [Fwd: ANSWER: General Comments from Mouser website.]

[Scott LaBombard]

Dwight ...

Without hauling out one of my H8's to confirm ...I believe that the
stock motherboard uses gold pins.

I assumed that Carroll provided the correct part number  ...which
would seem to confirm that belief.

Otherwise, I agree with your comments. That's why I mentioned
using tin contacts as a last resort (if at all)...


Scott

----- Original Message ----- 
From: "Dwight K. Elvey" <dwight.elvey at amd.com>
To: <sebhc at sebhc.org>
Sent: Monday, April 19, 2004 6:14 PM
Subject: Re: [sebhc] [Fwd: ANSWER: General Comments from Mouser website.]


> >From: "Scott LaBombard" <labomb at rochester.rr.com>
> >
> >Folks,
> >
> >A quick glance at http://www.molex.com/product/pcb/4455t.html shows that
> >there are a couple of alternatives for this part. If you want to forgo
> >'select gold'
> >and instead go for the plain old 'gold' contact part, then your part
number
> >would be 22-18-2253.
> >
> >The folks at http://www.arrow.com/aws/pg_welcome have this part in stock.
> >In addition, they sell to individuals and have no minimum order
requirement.
> >They show a price of $4.27 per unit.
> >
> >There's also a tin contact variation as a last resort ...
> >
> >
> >Scott
> >
>
> Hi
>  As I noted, you should only use gold if the mother board also
> has gold pins. Never mix metals on pin contacts. Contacts go
> bad fast enough as it is without adding electrolysis.
>  For those that worry about contact and want to protect their
> older machine, placing some Dow-Corning #4 silicon grease on
> the pins will improve contact and protect them from normal
> electrolysis. There are issues in a salt air environment
> but I've not had any problems and I live within 2 miles of
> the coast. The grease has no other electrical problems and
> is itself, non-conductive. I use it on, switch connacts, TV
> tuners, EPROM pins, card edge connectors, lamp sockets, power
> connectors, screws that hold regulators or power transistors
> and just about anywhere that one has metal to metal that
> has to carry current. I have a HiFi amplifier that has a
> toroidal transformer. This used to cause the power switch
> to arc and stick together ( I suspect the core was saturating
> on the first cycle ). I put the grease in the switch and
> it has been working fine for over 10 years now. When I
> worked at Intel, we did some studies on card edge connectors.
> The normal gold on gold contact had about 10 to 15 milli-ohms
> of resistance. With the grease, this dropped to under 2 milli-ohms.
> This was true even after the environmental chamber at 90%
> humidity where the normal gold on gold would degrade to around
> 30 to 50 milli-ohms. They chose not to use it there because
> once it got on a surface, one could not get lettering stamps to
> work. This isn't an issue for us because we rarely add such
> to our machines.
> Dwight
>
>
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