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

[Carroll Waddell]

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
>>    
>>
>
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>  
>