Making Keyboard Membranes

Any discussions related to the creation of new hardware or software for the ZX80 or ZX81
RWAP
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Re: Making Keyboard Membranes

Post by RWAP » Fri Dec 21, 2018 9:26 am

I did start a discussion a few years ago about CoCo membranes but there was just not enough interest - and not helped by several different membranes in these machines.

The main market seems to be in the USA and so ideally you need a manufacturer in the US because of the costs of importing them etc.

My thought was that these would only be viable if there were at least 250 needed.

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gammaray
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Re: Making Keyboard Membranes

Post by gammaray » Fri Dec 21, 2018 5:51 pm

Maybe a rubberized conductive paint is available to make small batches of membranes halves with conductive traces using stencil.

The nickel paint I just used is too brittle.
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM

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mrtinb
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Re: Making Keyboard Membranes

Post by mrtinb » Fri Dec 21, 2018 9:53 pm

Here https://www.smart-prototyping.com you can get flexible PCBs for ZX81 keyboard size for $480 for 10. That is $48 each.

They make flexible pcbs down to 0.1mm.
Martin
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube

RWAP
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Re: Making Keyboard Membranes

Post by RWAP » Fri Dec 21, 2018 10:02 pm

mrtinb wrote:
Fri Dec 21, 2018 9:53 pm
Here https://www.smart-prototyping.com you can get flexible PCBs for ZX81 keyboard size for $480 for 10. That is $48 each.

They make flexible pcbs down to 0.1mm.
Except they are based in China - so you also have to add on US taxes and potentially import duties as well - will be close the $60 each already mentioned...

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gammaray
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Re: Making Keyboard Membranes

Post by gammaray » Mon Jan 14, 2019 9:39 pm

Actually I am thinking I need two so that would be $240 each cuz the other 8 would go unsold and get thrown away in a few decades. :D
mrtinb wrote:
Fri Dec 21, 2018 9:53 pm
Here https://www.smart-prototyping.com you can get flexible PCBs for ZX81 keyboard size for $480 for 10. That is $48 each.

They make flexible pcbs down to 0.1mm.
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM

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