[Coco] Coco KB membrane replacement

[Scott Wendt]

The membrain is just plastic sheets with traces on them. No hard PCB board.

________________________________
From: Coco <coco-bounces at maltedmedia.com> on behalf of RWAP Software <rich at rwapservices.co.uk>
Sent: Sunday, May 14, 2017 11:35:23 AM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] Coco KB membrane replacement

Is the membrane an actual hard PCB rather than a plastic membrane (with
silver tracks)?  Sending a picture would be an idea

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.

Rich Mellor RWAP Software www.rwapsoftware.co.uk<http://www.rwapsoftware.co.uk> www.sellmyretro.com<http://www.sellmyretro.com>

On 2017-05-14 17:21, RETRO Innovations wrote:
> On 5/14/2017 3:37 AM, RWAP Software wrote:
>> That seems excessive - but it depends on how many membranes you would
>> order.
> That price is for 100 units.  NRE cost is 804.00.  Unit price is
> 52.60.  That is actual cost, so no profit built into those prices.
> Does not include shipping, customs, etc.
>> The majority of the cost of setting up a new membrane production is
>> the initial laying out and graphics.  Most membrane manufacturers also
>> price themselves out of the market because they are not interested in
>> small production runs.
> I will do the layout, as it's just a PCB, and I can send gerbers.
>>
>> If I had an actual membrane I could always ask the manufacturer I use
>> here in the UK.
> I'd love to get an estimate from them.  I have the membrane (well,
> lots of folks can get it.  You can easily remove from the KB
> assembly), but I think if they just knew the dimensions and saw a pic
> of the flattened membrane, they could estimate.
>> The problem is knowing how many to order - realistically you are
>> talking of a production run of at least 250 membranes to make it
>> worthwhile from a cost basis.
> Possibly 250, but I would assume the per unit cost would not halve,
> and that still seems high.
>
> Jim

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