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Capacitance Keyboards
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john_crane_59
Anyone have experience rebuilding foam capacitance keyboards?
I tried rebuilding a Digital Group board, but roughly half of the keys don't work. I did notice the replacement adhesive foam described in the rebuild article I found was changed by the manufacturer over the years, from grey light foam to a denser slightly thinner white foam. I'm thinking that extra distance (about 1mm), could be enough to throw the capacitance off spec - so only some of the keys work. http://www.bytecollector.com/dg_keyboard.htm
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TexElec sells replacement foam discs for foam & foil keyboards. I haven't tried them personally as both my f&f boards work flawlessly, but I've heard nothing but high praise for them. https://texelec.com/product/foam-capacitive-pads-keytronic/
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Jim McClellan
Yep - Texelec has excellent capacitive foam pads when they're in stock. I rebuilt a Franklin Ace 1200 keyboard using them and they're excellent.
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john_crane_59
Thanks guys, I'll give it a shot.
The grey foam looks exactly like the original! However I'm worried about: 1) Aluminum pads may oxidize over time. Not sure if that will be an issue as it's a non-contact keyboard. The originals used a gold-leaf like material. It's possible that's just over-engineering. Heck, this whole keyboard is over engineered. If you dropped it, it could break your foot. 2) I may be altering the capacitance as the PC board pads and corresponding gold leaf original pads look like 4 petaled flowers, not circles. Will have to test. The keyboard BTW, is a Maxi-Switch, and their logo looks suspiciously like C3PO... 
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