YES, AND REMEMBER THE AGONY WE HAD TO GO THRU TO ERASE ALL OF THAT GOLD OFF
OF THOSE PADS BEFORE SOLDERING? WASN'T THAT FUN? ONE OF THE GUYS IN OUR PC
OPPERATION DEVISED A WAY TO MASK OFF THE PADS AND LEAVE THEM COPPER WHILE
THE REST OF THE CIRCUITRY GOT GOLD PLATED. WHAT A BLESSING THAT WAS! SEE I
AM ONE OF THE "OLD GUYS" TOO.
Ron Dieselberg
BAE SYSTEMS
Cincinnati Electronics Corp.

-----Original Message-----
From: Frank Davies [mailto:[log in to unmask]]
Sent: Wednesday, June 14, 2000 08:51
To: [log in to unmask]
Subject: Re: [TN] Gold over Copper?!?


-----Original Message-----
From: Gerry Cooper <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Wednesday, June 14, 2000 1:30 PM
Subject: Re: [TN] Gold over Copper?!?
--------------------------------------
Gerry
Its good to see someone else that also goes back that far on pcb,s. A good
bit of the guiden systems from North American Avaition (later Rockwell) for
the space program were gold boards, for the the early days thats all that we
made.
Frank
------------------------------------------


>Many years ago all circuit boards were plated with 100 U of gold directly
over
>copper.  This changed to 50 u when nickel was added, and later went down to
30
>u.  The problem is that copper migrates up through the gold if it is not
thick
>enough, the nickel acts as a barrier layer.
>
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