Came out of an A/C power source. The brand/company/manufacturers name of of “California instruments” and it was “A/C power source model 3001TCA” made between like 1985-1995 about if I had to take a wild guess. It’s some very complex equipment, but it’s outdated, and was not worth trying to resale as it wasn’t operable anymore, and dealing with freight shipping etc. so I scrapped it.When the foils peal off like this they are plated pretty thick with gold.
It's not going to be as much gold as you would think, there's still a layer of copper and possibly nickel under the gold but definitely more than mosr modern electronics .
What did this board come out of ?
Front and back picture of the foil peeled off the circuit board.
.....The fact that the gold didn’t flake off as fine dust tells you that it’s not ENIG.
Until you either process them or try peeling a piece of trace off each, you don’t know.
ENIG will even crumble to powders if you dissolve the substrate with acids......
If I understand correctly, are you saying that ENIG often will flake off of the copper trace when peeling, so peeling a sample trace is a decent way to help identify ENIG? I've heard of the eraser trick but could never get it to work.
.....
If I understand correctly, are you saying that ENIG often will flake off of the copper trace when peeling, so peeling a sample trace is a decent way to help identify ENIG? I've heard of the eraser trick but could never get it to work.
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