Search found 690 matches

by DMA
04 Aug 2020, 21:37
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2145
Views: 163318

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

You're just unpolite Guilty as charged. and detached from reality. Do you have a psychiatrist license to diagnose psychosis? If not - care to apologize? I'm trying to be realistic and to save a guy with good intentions some delusions. Suuuure. He doesn't even know how to make a pcb, which is the si...
by DMA
03 Aug 2020, 03:56
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2145
Views: 163318

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

I don't know how and why you think that you'll be able to succeed where other people have found big difficulties that make a project like this a really big task that involves engineering, programming, computer science, while requiring a lot of passion and dedication. And a good mood too, to deal wi...
by DMA
17 Jul 2020, 22:56
Forum: Workshop
Topic: READY - $10 - DIY Through Hole Universal Model F and Beamspring Controller
Replies: 77
Views: 7652

Re: READY - $10 - DIY Through Hole Universal Model F and Beamspring Controller

Just noticed that "$10" part is a lie. ProMicro alone is $12, and if you're buying things for a single controller the rest is likely $5+. Plus PCB.
by DMA
17 Jul 2020, 22:50
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2145
Views: 163318

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

Gentlemen, may be we should not indulge in necrothreading and make a new thread and discuss there instead.

I keep subscription active for an eventuality that OP returns. I have obligations.
by DMA
16 Jul 2020, 02:13
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2145
Views: 163318

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

^ you mean graphite additive.
I'm currently testing flipper material - charcoal doesn't work at all, graphite works above certain concentration, can't yet figure out the threshold.

Metal foil basically dominates everything.
by DMA
10 Jul 2020, 20:37
Forum: Workshop
Topic: READY - $10 - DIY Through Hole Universal Model F and Beamspring Controller
Replies: 77
Views: 7652

Re: READY - $10 - DIY Through Hole Universal Model F and Beamspring Controller

BTW, I would recommend a DAC with some faster bus. If you can reprogram it between scans, you can have per-column thresholds - which is not as good as per-cell, but close enough for practical purposes.
by DMA
04 Jul 2020, 19:53
Forum: Workshop
Topic: Pericom keyboard
Replies: 4
Views: 1298

Re: Pericom keyboard

Tools are not needed to pull the cap off from a standalone row. In low-profile ones you'll pull out more than a cap though (easy to push back in, so no worry), and in full-height ones you risk breaking the cap's stem (fixable by putting all pieces back and filling the cap with poxypol). Good thing y...
by DMA
04 Jul 2020, 19:27
Forum: Workshop
Topic: Rs232 trackball keyboard to USB
Replies: 4
Views: 1006

Re: Rs232 trackball keyboard to USB

I'm pretty new to this kind of stuff but I might give it a go Go ahead! Things are not that hard (though need some curiosity and persistence). Just figure out the ground and power and put huge labels on them so you don't accidentally swap them. Although for RS-232 the power supply is separate. Grou...
by DMA
03 Jul 2020, 22:32
Forum: Workshop
Topic: 65% Model F – Open Group Build
Replies: 55
Views: 11051

Re: 65% Model F – Open Group Build

Antenna would likely require bigger keepoff. I would expect USB-powering VDD, radio bypasses and low-voltage power banks (which also look like bypasses) vital for stability, the rest very optional. I'm not soldering BGAs either. Kitprog is indeed programmable and I use that in sun and ADB converters...
by DMA
03 Jul 2020, 22:09
Forum: Workshop
Topic: Rs232 trackball keyboard to USB
Replies: 4
Views: 1006

Re: Rs232 trackball keyboard to USB

Ugly blue converter doesn't work because it can't understand what trackball is trying to tell it. TMK/QMK must have lots of different serial modules, so if you can find the service manual or otherwise figure out the protocol - you can copypasta some RS232-USB converter pretty quickly. If you can ref...
by DMA
01 Jul 2020, 05:06
Forum: Workshop
Topic: KeyMason - CSS keyboard and keyset renderer
Replies: 1
Views: 1035

Re: KeyMason - CSS keyboard and keyset renderer

css-mug[1].jpg
css-mug[1].jpg (10.46 KiB) Viewed 1003 times
Looks cool tho
by DMA
24 Jun 2020, 23:50
Forum: Workshop
Topic: IBM Model F output invalid keypresses
Replies: 3
Views: 850

Re: IBM Model F output invalid keypresses

I had this exact problem with one of my Model F's. It was dust in the capacitive PCB. After I opened the assembly and cleaned the capacitive PCB the problem went away. This. Dust, bread crumbs, foam granules - turns out those flippers must stay really close to the PCB, even small particles halve th...
by DMA
24 Jun 2020, 23:49
Forum: Workshop
Topic: Hmm, I've got a (not so?) crazy idea
Replies: 15
Views: 1498

Re: Hmm, I've got a (not so?) crazy idea

It sounds like you might be a fan of when keyboards were desks :D desk.jpg Oh man yes! Some great stuff here. This is pretty close to what I had in mind. Just imagine something like this but with some glass on top of the keyboard that's level with the desk. 82e2e93e95a54243fc24de70f2d9cbd4.jpeg Ooh...
by DMA
24 Jun 2020, 07:39
Forum: Workshop
Topic: Epson Q703D-AA conversion
Replies: 41
Views: 2657

Re: Epson Q703D-AA conversion

Sorry, long delay. Finally I'm on leave for a month :) Yep, 160mA is the current system wants, you can lower the voltage somewhat to make 7805 less warm later For now 9V is where it should be. logic analyzer must have common ground with power supply - find the black (!!I'm totally guessing!! Consult...
by DMA
15 Jun 2020, 07:43
Forum: Workshop
Topic: Epson Q703D-AA conversion
Replies: 41
Views: 2657

Re: Epson Q703D-AA conversion

..this means it's working in a current source mode (and LEDs on it seem to agree with me) Which means device wants to draw more energy, but can't. (found the docs - yep, red and black are ones to use). Locate power rails (typically widest traces on the board) and measure voltage across them. It's pr...
by DMA
15 Jun 2020, 04:42
Forum: Workshop
Topic: Epson Q703D-AA conversion
Replies: 41
Views: 2657

Re: Epson Q703D-AA conversion

Does it say anything about bipolar mode? Some of those can actually provide +-5 (or +-15) volts, relative to the ground. Now, in your computer, ground is connected directly to the ground wire in the power plug AND the negative lead of the power supply, and in this thing - grounding wire is connected...
by DMA
15 Jun 2020, 03:02
Forum: Workshop
Topic: Epson Q703D-AA conversion
Replies: 41
Views: 2657

Re: Epson Q703D-AA conversion

Does black alligator clip contact the PCB ground? You need a common reference with the keyboard circuitry.
by DMA
02 Jun 2020, 00:06
Forum: Workshop
Topic: Epson Q703D-AA conversion
Replies: 41
Views: 2657

Re: Epson Q703D-AA conversion

kralcifer wrote:
01 Jun 2020, 22:36
ok will do. I didn't remove the voltage regulator so that's dropping it to 5V anyways.
you never fully know. Especially on PCB you didn't design (but even then..)
by DMA
01 Jun 2020, 06:32
Forum: Workshop
Topic: Epson Q703D-AA conversion
Replies: 41
Views: 2657

Re: Epson Q703D-AA conversion

Check LED resistors. 180 ohm for reds will not burn them off immediately at 9v, but will shorten their lifetime to like hours. 180R is for 5V.
by DMA
28 May 2020, 06:46
Forum: Workshop
Topic: Epson Q703D-AA conversion
Replies: 41
Views: 2657

Re: Epson Q703D-AA conversion

DMA, you've said that the protocol converter is a box providing the power and pretending to be the host. How exactly does it work? I was imagining that the PC is providing the power over USB to the conversion chip which would listen to RX and TX but I forgot that power needs to get to the whole PCB...
by DMA
26 May 2020, 08:11
Forum: Workshop
Topic: HP 9845 workstation keyboard (ITW Magnetic Valve)
Replies: 4
Views: 1932

Re: HP 9845 workstation keyboard (ITW Magnetic Valve)

Mmkay, you probably didn't succeed with conversion. The rows that go to daughterboard probably were too unstable - may be tripping adjacent rows, may be tripping 4 columns instead of one. I had a tall ITW board with long traces, which had the above symptoms. Ended up cutting ALL the traces and handw...
by DMA
26 May 2020, 07:48
Forum: Workshop
Topic: Epson Q703D-AA conversion
Replies: 41
Views: 2657

Re: Epson Q703D-AA conversion

Yep, that's foil. You're up for a lot of gluing (I see you've found a rubber-compatible adhesive already). It's also capacitive, there is no electrical contact (that thin track in the middle is ground, to reduce crosstalk). So when you're done with drying the glue, you'll need to find the buffers on...
by DMA
25 May 2020, 23:28
Forum: Workshop
Topic: Epson QX-10 Keyboard NKRO USB conversion (Fujitsu 2nd Gen Leafsprings)
Replies: 9
Views: 1962

Re: Epson QX-10 Keyboard NKRO USB conversion (Fujitsu 2nd Gen Leafsprings)

I've never done a conversion yet. I'm not seeing any mentions of Epson in Soarer/Hasu/Haata so far but still looking. Are sure it's foil? Leaf spring is a contact switch, * and foil is usually capacitive (look at Sangdrax's other posts for his foam-and-foil conversion adventures). It's pretty strai...
by DMA
23 May 2020, 00:39
Forum: Workshop
Topic: IBM 5251 terminal USB conversion (but not what you think)
Replies: 51
Views: 9122

Re: IBM 5251 terminal USB conversion (but not what you think)

One of the biggest issues I saw when passively sniffing the line between a real S/36 and different terminals is lack of hysteresis in the receiving circuit. I may have read something wrong, but it looks like you have 22 1.6V pulses - 11 on phase A, 11 on phase B - for clock recovery before actual t...
by DMA
27 Apr 2020, 20:52
Forum: Workshop
Topic: Model F PING dampen methods comparison
Replies: 7
Views: 697

Re: Model F PING dampen methods comparison

Hi, that is an interesting method. I was more focused on a comparison to the floss method specifically targeting ping. Regardless If one wanted to reduce noise I imagine that would take away some of the upward click noise. I wonder if there is an audio comparison with the sealant. So I think that i...
by DMA
27 Apr 2020, 18:33
Forum: Workshop
Topic: Model F PING dampen methods comparison
Replies: 7
Views: 697

Re: Model F PING dampen methods comparison

how about a small blob of silicone sealant on the underside of the barrel assembly? I've got pretty good noise abatement out of that. There's even a post somewhere around.. Hi that is interesting. Do you have a photo of that, not sure where you mean. https://deskthority.net/download/file.php?id=394...
by DMA
27 Apr 2020, 08:31
Forum: Workshop
Topic: Model F PING dampen methods comparison
Replies: 7
Views: 697

Re: Model F PING dampen methods comparison

how about a small blob of silicone sealant on the underside of the barrel assembly? I've got pretty good noise abatement out of that. There's even a post somewhere around..
by DMA
10 Apr 2020, 08:27
Forum: Workshop
Topic: CommonSense: matrix LCR meter with a HID interface
Replies: 569
Views: 67549

Re: [Done] CommonSense: matrix LCR meter with a HID interface

I want to share the thresholds because i think they are really low numbers. All of them between 1 and 3. Hardware -> ADC resolution, bit -> 12 That should pull you into 40-ish-at-rest territory, so you can set thresholds to like 15 and forget about key spam. Wiring is fine but kek try to get xwhats...
by DMA
08 Apr 2020, 03:25
Forum: Workshop
Topic: CommonSense: matrix LCR meter with a HID interface
Replies: 569
Views: 67549

Re: [Done] CommonSense: matrix LCR meter with a HID interface

shine wrote:
08 Apr 2020, 00:27
What i couldn't compile was hidapi, but i don't think it's really needed so.. wish me luck!
You don't need to - unless you want to modify the utility _and_ do it on non-linux. There are precompiled versions in "Releases" section of repo.
shine wrote:
08 Apr 2020, 00:27
Great job, DMA
Thanks!
by DMA
05 Apr 2020, 00:37
Forum: Workshop
Topic: A Smaller Xwhatsit
Replies: 105
Views: 11557

Re: A Smaller Xwhatsit

PS, in case you're not following Ellipse's model F thread, webwit's problem has been solved by me here: https://deskthority.net/viewtopic.php?p=461764#p461764 Welcome to the club. Layers problem has a much simpler solution: just detect "last physical key released" event and clear USB reports on tha...

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