Re: [ql-users] Membranes

[Al Feng]

EVERYONE!   Speculation about the material used in the QL's membranes by Sinclair or otherwise seems futile.   It is worth noting, IMO, that the reason that the membranes have failed in the past, and will probably fail in the future in a standard QL configuration IS singularly BECAUSE of the proximity to the heatsink.   Think about it.   As long as the standard PS configuration is used, you are baking the tails.  The rest of the keyboard membrane does not appear to suffer from the problem of becoming brittle.   If you want to make a BETTER *membrane*, then get hold of a TS-2068 and see how Timex made their keyboard -- printed circuit, carbon pads to close the circuit, ribbon wire tails attached to a connector.   Worrying about the pressure needed to actuate a "key" is a silly exercise if you are simply trying to create a replica of the original membrane because your keyboard membrane's tails will inevitably suffer the same fate which the original membranes experienced ...   Al     On Fri, 8 Mar 2002 08:54:32 +0000 Tony Firshman <[EMAIL PROTECTED]> writes: > On  Thu, 7 Mar 2002 at 13:50:20, Phoebus Dokos wrote: > (ref: <[EMAIL PROTECTED]">[EMAIL PROTECTED]>) > > >At 01:48 ìì 7/3/2002, you wrote: > > > > > > > >>In reply to my own post, I have one particular question. > >> > >>What is the specified and typical force required to actuate a key > on a QL > >>keyboard? Newtons or ounces please! > >> > >>Dave > >>ql.spodmail.com > > > > >Maybe an owner of the QL Service manual will be able to answer > that... > Nothing anywhere near in that - it is a very sparse document.  The > only > mention of the keyboard is keyboard connections. > I would think it would be much like any PC keyboard - the key > pressure > is much the same. > > The UK manufacturers (NFI now Polyflex it seems) might help. > I suspect they were taken over by an American company - address on > web > site <URL:http://www.applegate.co.uk/elec/company/ct_4455.htm> > > Last time Bill Richardson got QL membrane made by NFI, they did > minimum > 5000 for QL, but that was part of a Spectrum membrane job too. > > > -- >         QBBS (QL fido BBS 2:252/67) +44(0)1442-828255 > <1stname>@<surname>,demon.co.uk  http://www.firshman.demon.co.uk >       Voice: +44(0)1442-828254   Fax: +44(0)1442-828255 >    TF Services, 29 Longfield Road, TRING, Herts, HP23 4DG >