[Coco] Coco KB membrane replacement

[Salvador Garcia]

A soft rubber dome with conductive material is used on a number of remote controls, but what I have found is that after repeated used, the dome cracks and loses the ability to regain its original shape. I have a car alarm remote that is benched because of this and a TV remote that seems to be experiencing the same problem. Salvador


      From: Dave Philipsen <dave at davebiz.com>
 To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> 
 Sent: Sunday, May 14, 2017 4:15 PM
 Subject: Re: [Coco] Coco KB membrane replacement
   
This makes me think:  If I understand its operation correctly, there are 
just two pieces of mylar with conductive traces and pads on each side.  
The pressure of the key causes a pad on one layer to connect with pad on 
the other layer.  Why not design a PCB with some sort of small domed cap 
or other conductive material which shorts a couple of pads on the PCB, 
when pressed, at each key location?

Dave


On 5/14/2017 3:22 PM, RETRO Innovations wrote:
> On 5/14/2017 1:35 PM, RWAP Software wrote:
>> Is the membrane an actual hard PCB rather than a plastic membrane 
>> (with silver tracks)?  Sending a picture would be an idea
> Chris' website shows the KB membrane:
>
> http://www.insentricity.com/a.cl/210/the-future-of-the-membrane-empire
>
>>
>> I have never looked into replacement PCB membranes and so far as I 
>> know, the supplier I use does not provide these (because they 
>> specialise in small quantity membrane keyboards), but might know a 
>> producer.
> If they specialize in membrane KB assemblies, they'd be a perfect 
> choice to get a quote from.
>
> Jim
>


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