"NSM" wrote in message news:xr%xd.10649$KO5.8081@clgrps13...

"Si Ballenger" wrote in message
...
| On Tue, 21 Dec 2004 18:01:20 +0000, Guy Macon
| wrote:
|
|
| Richard H. wrote:
|
| Another option: Aluminum tape. Used for furnace ductwork; purchased
at
| the hardware store in a roll like duct tape. It's thin metal foil
with
| strong adhesive on the back. A great fix for membrane keys that've
lost
| their conductivity.
|
| Aluminum is a poor choice. When exposed to air it forms a
| non-conductive layer of aluminum oxide. Tin or Gold-plated
| or even Copper foil would work far better.
|
| Sounds good. So where can these adhesive backed foils be easily
| purchased at a reasonable price?

Copper foil is used for crafts but may be too thick.

N



And shielding, sticky copper tape is readily available.

I find though that those keypads don't really lose conductivity, they simply
become saturated with skin oils. A good scrub of the membrane and circuit
board with liquid dish detergent has fixed every one I've encountered yet.