Silicone dome switches? Need help IDing

Rfrayo · 31 Jan 2022, 01:41

I have a keyboard from a really old MIDI/SMPTE device and all the keys work perfectly save for one.

The issue is within the key, the dome has lost its ability to spring back. It's not a regular dome, but one with a tiny conductive circle in the middle that bridges two contacts when pressed (this device dates to 1985).

The dome is 10mm across with .1mm base around it. The conductive pad is 3mm in diameter. Vertical travel is approximately 5mm.

If anyone could point me in a direction where I could replace the dome, or locate a keyboard with the same type of switches, that'd be helpful.
Switch

: switch.PNG (1016.46 KiB) Viewed 3792 times

Dome:

: dome.PNG (1.03 MiB) Viewed 3792 times

jsheradin · 31 Jan 2022, 01:56

I believe those are wiki/Alps_integrated_dome switches if it's any use. Not sure of an easy source for new domes though.

Polecat · 31 Jan 2022, 01:59

Possibly Alps integrated dome:

wiki/File:Alps_integrated_dome_Alps_pla ... nition.jpg

Rfrayo · 31 Jan 2022, 02:09

WOW! Alps Mount Square Slider Blue with Conductive Rubber Dome.

That's impressive! Many thanks!
I would love to find either a replacement dome or key switch. If anyone has one to spare, I'll be more than happy to provide compensation.
Now that I know what I'm looking for, I'll keep searching for either a key or a keyboard or something.

SK-8K · 31 Jan 2022, 02:48

I have a few of the round slider versions. I'm not sure if the dome would fit.

Rfrayo · 31 Jan 2022, 20:25

What are those like?

I'd feel bad depriving the world of a vintage keyboard by buying one on ebay just to get the domes out of it.

If you're up for mailing me one, I can definitely Paypal you for your trouble.

Rayndalf · 01 Feb 2022, 03:21

I'll see what I have. I have a couple scrap boards that would love to help.

Rayndalf · 01 Feb 2022, 03:40

This thing got a bit crushed in postage (most of the numrow switches are crushed) then I fried it on US power.

So... well if you need switches I have some.

Rfrayo · 01 Feb 2022, 20:14

Perfect! Please send me some details as to how I should proceed. That would be awesome if I could get one (or even 3 in case others give out on me).