Dell rubber dome conversion to Mechanical (Quietkey SK-8000)

[SK-8K]

I am working on this idea I had, I got a Dell Quietkey SK-8000 and I am trying to convert it into a mechanical keyboard.
I modified the case with a dremel tool and now I am working on a PCB to replace the original membrane circuits:

dqk.png (4.88 MiB) Viewed 13600 times

sk-800 pcb.PNG (32.61 KiB) Viewed 13600 times

The PCB will bolt to the original backplate of the keyboard with M2 fasteners. There will be a sheet of kapton to insulate it from the PCB.

It is a slow process to probe the contacts of the membrane.

Any tips and tricks are appreciated.

[Findecanor]

If you had measured the spacing between key groups, and they had been 1/2 and 1/4 keys, then you could have used a PCB and plate for a Filco Majestouch or similar, because that is quite common.
It looks like vertical spacing between the alphanumeric section and function key row is 1/2u anyway.

BTW, are you going to use quiet switches in your QuietKey ?

[SK-8K]

If this PCB design works, I will have 5 from JLCPCB. The first prototype I will use these cheap MX Blue knockoffs, so it will be a LOUD key! I do want to build some more with better switches including quiet switches like the new silent T1s.

So if anyone has junk SK-8000s, hang on to them so I can mod them in the future!

I can't use an existing PCB there is a 7.05 mm island between the key groups which isn't standard.

An ALPS version is possible in the future but it would require special plate design and more modifications to the top case. I used an ALPS/Cherry hybrid footprint on this PCB

In the future I want to do similar projects with the Dell Oval and IBM/Lenovo Preferred Pro keyboards.

[SK-8K]

PCB is now in production, hopefully I did everything right.

Capture.PNG (56.57 KiB) Viewed 13413 times

[SK-8K]

I decided to do Cherry only for now to save on drill costs. In the future I may just make my own controller board because tracing out the matrix was very stressful to do. Maybe I will use this controller:
https://www.sprintek.com/en/products/ke ... K5126.aspx

[SK-8K]

PCB test:

DSC04564.jpg (1.07 MiB) Viewed 13263 times

DSC04563.jpg (1.35 MiB) Viewed 13263 times

[SK-8K]

DSC04569.png (3.91 MiB) Viewed 13209 times

DSC04577.png (3.18 MiB) Viewed 13209 times

[Rayndalf]

I decided to do Cherry only for now to save on drill costs. In the future I may just make my own controller board because tracing out the matrix was very stressful to do. Maybe I will use this controller:
https://www.sprintek.com/en/products/ke ... K5126.aspx

I reccomend just using a pro micro and QMK.
But that might work as well.

Do you have any extra PCBs?

[SK-8K]

I have 3 extras which I will use. I am making a Revision 2 PCB which I will release to the public. It will correct some misallignment issues and hole placement and will have support for ALPS and I-Rocks switches.

On Ebay I have found some 0.6mm plastic pieces that I will use instead of the backplate.This prototype just has foam there.

[SK-8K]

2nd build started,the Dremel cuts are much cleaner this time. Switches: YOK trash pandas switches.

DSC04581.png (3.61 MiB) Viewed 12941 times

[SK-8K]

Without any lubrication, foam, etc. these switches have quite a deep sound in the QuietKey chassis! It may sound better when I install the plastic sheets I got to support the PCB.

[SK-8K]

This one will be my new daily driver. Too bad the Geekhack scumbag moderators won't see it.

DSC04597.JPG (1.61 MiB) Viewed 12648 times

4:3 gang!

[Rayndalf]

This one will be my new daily driver. Too bad the Geekhack scumbag moderators won't see it.
DSC04597.JPG
4:3 gang!

Really looks solid. Does the PCB support winkeyless as well (winkeyless Quietkeys exists but they might have a different controller/matrix)?

What happened with the GH mods? They can be a bit up tight but I haven't had any bad experiences myself.

At least GH actually has mods

[Muirium]

At least GH actually has mods

Indeed!

I've long been on the record as one in favour of more moderation here: kicking shit-stirrers and politics trolls. (Keyboard trolling is fine.) Better and for worse, Webwit was always against intervention. I wasn't around for the Ripster Incident. I imagine it must have involved noodles.

Hopefully Someone's still deleting spam these days…

GH, meanwhile, has a longstanding reputation for dodgy moderation in its marketplace. Fingers on the scales and such.

[fohat]

What happened with the GH mods?

It was over a string of anti-vax related posts.

[Muirium]

Because a keyboard forum is definitely the place to go for your data on epidemiology.

[SK-8K]

It was an off-topic thread and I just casually floated some experiences and opinions on the subject because I was bored.

They shadowbanned and eventually fully-banned me when a simple "I disagree, and here's why..." would have sufficed.

Why not let fellow keyboard nerds be adults and respectfully chat, even if our opinions on a subject are radically different?

But I've moved on from all that, Deskthority and Nexthority are my home bases now to continue making cool keyboards.

[Rayndalf]

Geekhack has countless subforums. I haven't been in most of them.

They seem like weird little caves.

[ifohancroft]

Do you happen to have any progress on the project?

[SK-8K]

Yeah I made Rev. 2 which supports BAE and corrected some measurement errors from the first one.
Random pics of the Rev 2. boards:

b7e348e5adcb66b8739fbc54be67604358770886[1].jpeg (206.47 KiB) Viewed 4719 times

92ed7aca5d859556001ffb13a20af0c8da571c6e[1].jpeg (128.43 KiB) Viewed 4719 times

s-l1600[1].jpg (579.67 KiB) Viewed 4719 times

5b2358652d5ad1ca8d59881d42e7b16d1a25a4e0_2_666x500[1].jpeg (37.19 KiB) Viewed 4719 times

75370a001bf4c059356bc6832682d57b8b90456e[1].jpeg (1.63 MiB) Viewed 4719 times

a6e81f300510b3cea45de97e12fab75a2521f3bf[1].jpeg (1.85 MiB) Viewed 4719 times