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

[Scott LaBombard]

Carroll ... the part number that you provided was for the gold plated
part. Curious ... if you have the tin plated motherboard pins, why are
you searching for the 2251?


Scott

----- Original Message ----- 
From: "Carroll Waddell" <CarrollWaddell at sc.rr.com>
To: <sebhc at sebhc.org>
Sent: Monday, April 19, 2004 9:06 PM
Subject: Re: [sebhc] [Fwd: ANSWER: General Comments from Mouser website.]


> Some H8's may have had gold contacts, but the 3 that I have all had tin
> plated contacts.
> CEW
>
> Scott LaBombard wrote:
>
> >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
> >>
> >>
> >>--
> >>Delivered by the SEBHC Mailing List
> >>
> >>
> >
> >--
> >Delivered by the SEBHC Mailing List
> >
> >
> >
>

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