This is a good approach as it solves the temptation of
putting a PTH under compression, which is a no-no (subject
to broken connection).
> As currents flow, and I have two dissimilar metals (PCB: either copper,
> tin-lead plate or nickel plate, Chassis: zinc treated/passivated sheet
> steel) I have all the ingredients for galvanic corrosion and reduction
> in effectiveness. The zinc is the killer but that seems to be the way
> all PCs are made.
This is absolutely an issue and may introduce a resistance
right where you're not expecting one.
Perhaps this is acceptable in PCs as in my experience they
don't stay assembled for too terribly long ;)
I'm no chemist but I believe tooth washers (in stainless?)
are the answer to this...
-- Jeff Seeger Applied CAD Knowledge Inc Chief Technical Officer Tyngsboro, MA 01879 jseeger "at" appliedcad "dot" com 978 649 9800
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