Re: [cosmacelf] Re: I'm thinking of cloning the VIP...
- On 5/7/2013 9:19 AM, darcy_ro wrote:
> The Grayhill keypad is/was the 84BC1-004. It has 0.75" switchThe Grayhill switches I've used in the past were expensive, but of
> centers, common bus and a molded-in legend with the same layout as
> the VIP. The other Grayhill series are too small, and the
> relegendable types are ugly.
excellent quality. They were used in test and industrial equipment where
they needed to last. There was one that was a dead ringer for the one
RCA used on the VIP -- maybe it *was* a grayhill part.
> I have looked at other ways of building the keypad, including usingI found the no-travel VIP switches a bit tiring to use, I think I would
> Cherry MX series switches and sourcing keytops from WASD Keyboards.
> But of course it won't look like the VIP using those switches.
have preferred a taller keypad with some key travel instead. Sometimes
copying the past means you are stuck with the mistakes and limitations
of the past.
> For the money, maybe a custom mylar overlay is still the way to go -The problem isn't a lack of choice; it's too many choices! There are
> but makes it hard for others to duplicate.
hundreds of switches to choose from; Everything from full-travel
keyboard switches to tiny cheap tactile switches are available. Sure
they cost money; but how much time and effort do you want to spend to
Or, you can build your own. The VIP keyboard is mighty simple to
duplicate. You could etch comb traces on the PCB, and stretch a piece of
metalized mylar over it. Use tin plating on the board if you only want
it to last a few years, or gold plate it to last. Lots of places will
print custom mylar labels with any legend you want. A 3D printer could
make the black plastic body.
Or, you could use a resistive touch switch, where the skin resistance of
your finger bridges two foil traces to close the switch. You can't get
any cheaper than free! :-)
There ain't no rules around here. We're trying to accomplish something!
-- Thomas A. Edison
Lee A. Hart, http://www.sunrise-ev.com/MembershipCard.htm
- That sounds great. I hope you can find a hexpad that will work for you.
Looking forward to your updates.
--- In firstname.lastname@example.org, "darcy_ro" <darcy_ro@...> wrote:
> I haven't had a lot of time to pursue this. I recently purchased a VIP to use as a model, though. The keypad still presents some difficulty, to get the correct feel and appear professional. There is a Grayhill keypad very close, but purchase minimums mean I'd have to commit to a fair amount of money.
> When I'm done I'll release the artwork as a set of Gerber files and a BOM. That way everyone can make one. I have no interest in selling kits or keeping it for myself.