New pcb design for S-100 prototype board available

Brent Hilpert hilpert at cs.ubc.ca
Mon Jun 4 16:49:01 CDT 2007


Grant Stockly wrote:
> 
> Chuck Guzis wrote:
> >
> >I learned that the rule was "gold against gold" and "tin against tin"
> >for edge connectors and IC sockets.  Otherwise, there would be
> >galvanic corrosion between the tinned and gold surfaces, particularly
> >in high-humidity environments.
> >
> >Is this not true?
> 
> I'm not sure.  I have a 30 year old Altair with gold plated sockets and tin
> plated boards.  Works fine and I don't see any oxidation.  I pay about $5-7
> extra per PCB to get gold plated fingers, just because people buying my kit
> are most likely not buying it for what it does but more likely what it
> looks like.  : )

I would have thought as Chuck did, however I scrapped some circa-1969
Hewlett-Packard reed-scanners 3-4 years ago which were similarly tin-plate PCB
fingers in gold-plated sockets. The tin plate was as shiny and clean as if it
just came out of the dip!



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