I'm not familiar with conductive epoxy, so will investigate that.

Silver (which I can get from the PCB house at much lower cost) will=20
tarnish relatively quickly (few months) so won't be a good choice for=20
the membrane-switch pads.

Cheers,
-Neil.


On 11/23/2014 1:34 AM, RussellMc wrote:
> On 23 November 2014 at 18:37, Neil <picdude3@narwani.org> wrote:
>
>> I'm looking for a conductive carbon coating that I can apply to PCBs
>> myself, for conductive membrane switches.  Or something else
>> ...
>>
>
> Just some ideas.
> I do not know how suitable any of these would be.
> I've never tried  them. Each should have level of conductivity needed.
> May have degree of wear resistance needed.
>
> - Conductive epoxy.
>
> - Silver-loaded track repair lacquer which does not conduct unti 'set'.
> As carrier liquid evaporates silver particles produce conductive strip.
> I've used this for repair of fractures in flexible carbon tracked keyboar=
d
> tails.
>
> - Stick layer of eg butyl rubber (carbon loaded) to board surface in
> contact with a conductor.
>
>
>
>        Russell

--=20
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