Entries tagged 'cat:Electronics'

Portable DIY CD Player Entry created on 2025-11-28 Authors: steeph (364) Categories: CD Players (1) CD-ROM (2) Computers (19) DIY (15) Electronics (15) Music (5)

I've had an idea!

What if there was a CD player that you can carry around and that's completely battery powered so you don't have to plug it into anything to use it? You could even use it outside!

Here's my prototype. A DIY portable CD player.

Yes, it has a CD-ROM drive from a desktop computer. I wanted to build a player like that since I was about 16. Back then CD drives still had play buttons and volume controls. But I accidentally killed it by swapping ground and 12 V. When this one fell into my hands this year, I knew what to do.

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Old Cherry Keyboard Repair Entry created on 2025-09-14 (edited 2025-11-17) Authors: steeph (364) Categories: Computers (19) Electronics (15) Keyboards (10) Vintage Computing (2)

I found a Cherry G81-1000 in the scrap recently. It's one of those old 101 key models with a metal board and oldish mechanical switched. Model M fans would probably disagree. But it is comparible with an IBM Model M in many ways. Maybe it's becasue Model Ms are still produced that, from what I saw, Cherry G81-1000s are offered for more on eBay. So they do seem to be of interest to other vintage computer fans, not just me.

To test it I first had to replace the cable. I decided for a cheap, black audio cable with two 5-pin DIN plugs. I say audio cable because hat's what it was advertised as. It has no shielding at all. Anyway, just becausew they used proper shielding back then doesn't mean I need it. Because I'm not involved with the computer keyboard fan bubble I had no idea where to find the pinout on ther PCB. Web search engines were of no help. But since a stub of the original cable was still on it, I knew which colour of the original cable goes where. I then checkerd three other (a bit newer) Cherry keybards and found them to use the same colours. I tried the same pinout and it works. I'll attach a diagram just in case anybody needs to do the same thing.

The keybnoard is generally working. But typing does not feel nice and some keys stopped working after a while. From their arrangement it is pretty obvious that one trace on the board must be broken. Here starts the bigger problem. Because of the way the board is constructed, the most of the traces aren't accessible. They are covered by a metal shet from the back and the switches from the front, which are connected to the metal sheet. I know how to repair traces of a keyboard matrix on such a flexible PCB. But if I can't reach them without destroying either be PCB or the switches, that knowledge is not worth anything.

During my research on those old boards I also found out why the switches look so different from MX switches and why they feel so weird. They aren't really mechanical switches, but rather Cherry MY switches, which use indivisual membranes inside. This explains why typing on it feels so bad. I did not find a way to repait the trace, yet. But knowing now that nor cleaning nor using the switches for a while will make them feel better, it does not feel worth putting more time into this.

I initially thought it might be a good idea to design a PCB with a key matrix that replaces the original switch PCB. The new one could be populated with MX switches and thus the entire device updated to an excellent version of itself. But there are free open source PCB designs out there that replace the entire inside of the keyboard. That would be the easier route. And it would upgrade the keyboard to USB at the same time. Although the Atmega used in those could probably be programmed to use a simpler serial interface as well.

It would be nice to continuie here with "So I ordered one of those, done up the keyboard and it's now my favourite one." But I have enough unfinished and unstarted projects already. So no, not right now.

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"RGB LEDed" Shop Sign Entry created on 2020-12-04 (edited 2025-07-17) Authors: steeph (364) Categories: Arduino (3) DIY (15) Electronics (15) Lamps (1) Light (4) Projects (40) Languages used: en (251) Topics: Projects → Arduino (3) Projects → Light (2)

Found this old shop sign on ebay Kleinanzeigen. Idk, I just wanted to have it. Picket it up for 10 € since it wasn't far from me. Put some RGB LEDs and an Arduino inside, used some sample RGB LED sketch, Robert is your uncle. This was a straight forward mod, but I like the effect a lot. I nevr changed the default animation. The lamp has been to camps and other events and is now either lighting up the art area of my new home or adding colourful admosphere to it.

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WAMP 2023 - Close-Up Shots Of Things Lying Around And Stuff But Not People Entry created on 2024-01-09 Authors: steeph (364) Categories: Camping (6) Camps (6) Electronics (15) Events (22) Macro (3) Photos (29) Westerwald (3) Westwoodlabs (3) Languages used: en (251) Topics: Events → Camps (6) Events → Chaos → WAMP (5)

I brought a camera to WAMP last year. The resulting pictures are very underwhelming. But because I was there and my brain has experiences and memories connected to them, I deem them worthy of being here. These are close-up shots of things lying around and stuff but not people. There is a separate entry with macro shots of things lying around and stuff but not people.

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WAMP 2023 - Macro Shots Of Things Lying Around And Stuff But Not People Entry created on 2024-01-09 Authors: steeph (364) Categories: Camping (6) Camps (6) Electronics (15) Events (22) Macro (3) Photos (29) Westerwald (3) Westwoodlabs (3) Languages used: en (251) Topics: Events → Camps (6) Events → Chaos → WAMP (5)

I brought a camera to WAMP last year. The resulting pictures are very underwhelming. But because I was there and my brain has experiences and memories connected to them, I deem them worthy of being here. These are macro shots of things lying around and stuff but not people. There is a separate entry with close-up shots of things lying around and stuff but not people.

File Attachments (30 files)
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Entry created on 2023-07-11 Authors: steeph (364) Categories: Computer (77) Electronics (15) ISA (2) MFM (2) Retro Tech (6) Story (5) Languages used: en (251)

As a child I used to play with old PCs, take them apart, assemble different parts to new PCs, etc. One day when I was 12 I was carrying a 486 Desktop PC to a friend's house, who lived in a different part of the town. On my way there a man stopped me and asked me if I'm interested in computers. He told me he has lots of computers and computer parts at home and I could look at them, pick anything I wanted and take it home to keep. I just had to come home with him and I'd get all the computer parts I wanted. Sadly I couldn't, because my freidn was waiting for me and expected me to bring the 486. So the man gave me his phone number and told me to definitely call because he would soon have to through away good comuter parts if I wouldn't take them.

Back at home I told my mother about the man. For some reason she thought that it was a strange thing to stop a child in the street for and that I shouldn't call him. I replied "He's liek 80 or 90 or something and he said he has to throw the stuff away if I don't take it." I'm not entirely sure whether it was more the age esitmation or my fear of good tech getting thrown away that let her give him a chance to explain himself. So, I called him, took a train to his house and you may guess what happened there, or continue reading, or both.

He lead me to his basement. It was huge. It seemed larger than the already large house. And every single room of it, including the hall in the center, was filled with PCBs, monitors, PCs, racks, more PCBs and cards, software packages (those thick ring binders with manual, diskettes and sometimes printed source code or other notes ticked in an even thicker cardboard box), ICs and other small parts in transparent boxes, empty boards and all the chemicals needed to make your own PCBs, some unfinished projects, home-grown microcomouters, printers, cables, and so on. A retro computer fan's paradise! He was in my home town because he visited a medical specialist. I'm guessing that he knew or suspected that he didn't have much time to get his hobby stuff into the hands of somebody who'd appreciate it. The latter was certainly his goal and did appreciate the tech, which seemed to make him very happy. But I only realised many years later how much more there would have been to appreciate. Back then I wasn't interested in ISA memory extension cards. They were slow and small compared to even SIMM modules. I didn't care for his software collection at all. And I didn't see what I couldn't have done with a custom build computer for which no software existed except what you write yourself. I had no use for his chemical laboratory, hard disks with less than 100 MB of space or electronic parts like logic gates. An 8086 PC was just a worthless piece of too slow hardware to get any fun out of it. I used an MFM drive solely to open it up and take it apart to see how they built these things.

Recently I was thinking, that old man met me too early. My interest in computers was not developed enough at the time. But he did die soon after I visited his house. So for getting some of his computer stuff to somebody who'll at least do something with it before it gets thrown out it was just the right time. I didn't know him, just met him once after his suspicious chat-up. But his wife actually thanked me after he had died. So maybe I didn't come across as greedy or too selfish.

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3mm LEDs (Macro Picture) Entry created on 2023-02-26 Authors: steeph (364) Categories: Desktop Wallpapers (2) Electronics (15) Gay Colours (1) LEDs (1) Pictures (61) Rainbow (1)

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To the extent possible under law, steeph has waived all copyright and related or neighboring rights to this work.

Just a photo of 3mm LEDS that I took a while a go. I like it for it's simple techness, rainbowness, high resolution and general look (glow).

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3mmLEDs-3mmLEDsRainbow.jpeg (image/jpeg, 2475535 B)
3mmLEDs-3mmLEDsRainbow.jpeg (image/jpeg, 2475535 B)
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Phones people say don't exist but they do Entry created on 2022-08-01 (edited 2022-08-04) Authors: steeph (364) Categories: Batteries (7) Displays (5) Electronics (15) Keyboards (10) Phones (3) Languages used: en (251)

Some people say things like: Phones should have bigger batteries, I don't care how thick it is. Or: Why aren't there any smartphones with screens smaller than 5 inches anymore? Or: There used to be a wider variety of phones; I'm missing keyboard phones/rugged phones/phones without a bunch of bloatware/etc. I think it is a very small group of people who feel like this strongly enough to say it. But I keep stumbling over such comments and I notice them because I have sometimes felt the same. And there's some truth about some of it. The most popular phones are all large and thin with privacy-invading bloatware that you can't uninstall and often with other malware pre-installed. They don't have keys on the front and you can't simply switch out the battery. But there is a bigger variaty of phones than there has ever bean. If you're missing a certain feature in your phone and can't find one that has it, you probably haven't looked far or long enough. I'd just like to mention a few manufacturers of not entirely mainstream phones and then maybe I'll make individual entries about some of them later with more information.

Keyboard phones

Notable options are:

F(x)tec: Flips open, keyboard in the style of late Nokia keyboard smartphones, best for thumb-typing, currently the first version is only available used and the newer version is currently shipping to Indiegogo backers. So it should be available without a long wait from the web shop soon.

Planet Computers: Different variants available, older ones are clam-shell, the latest is trying a new mechanism that leaves the touchscreen on the outside and usable when the physical keyboard is closed. Keyboard in Psion Series 5 style, best for table typing.

Unihertz: Clones of late Blackberry keyboard phones, screen above keyboard, for thumb-typing.

A used phone. Because you can still get a blackberry if you like. A few weeks or months from now you probably wouldn't be able to tell the difference between you almost new one and a refurbished one anyway. It's cheaper, you have more devices to choose from and it's better for the environment (whatever your definition of that may be). Did I miss or forget an option?

Phones with small screens

Uniherts also has started to fill this gap. Or you can get an older phone, maybe a used one. A few weeks or months from now you probably wouldn't be able to tell the difference between you almost new one and a refurbished one anyway. It's cheaper, you have more devices to choose from and it's better for the environment (whatever your definition of that may be). Did I miss or forget an option?

Phones with large batteries

If that's your one important requirement, you have many cheap phones that claim to have batteries with around 10 Ah (yes, 10.000 mAh if you prefer to see read more zeros) to choose from. Some manufacturers that I don't know anything about are: Yess, Gionee, Blackview, Ulefone. Ulefone seems to have several current models to choose from and I know somebody who is happy with theirs, whatever that tells you. I'm sure there are more brands of phones with giant batteries. But I'm personally happy with the 2 to 3 days I get out of my regular phone. I only complained about this when phones would at most last for one day without getting charged. If you're content with a battery with a capacity of around 6 or 7 Ah, you have even more to choose from and that range has actually started to enter the mainstream phone market (Huawei, Samsung, Asus, ZTE, …). You'll easily find some if you look for them. But many still don't think of searching for one. I guess this has been more of an issue 10 years ago, where phones needed more power to come through a day while at the same time no smartphones with big batteries existed. Getting an external battery that clips to the back of your phone has been more of a thing back then. That's still an option if such a product exist for your phone or you really love duct tape.

Headphone jacks, removable batteries, hardware buttons below the screen, ...

How about getting a used phone. A few weeks or months from now you probably wouldn't be able to tell the difference between you almost new one and a refurbished one anyway. It's cheaper, you have more devices to choose from and it's better for the environment (whatever your definition of that may be). Or at least I read that somewhere a few minutes ago. There are new phones with current hardware that haven't given up on these concepts. But none that I care to mention and the choice of phones with current hardware and easily removable batteries or hardware more than one hardware button below the screen doesn't appear to be good. Did I miss one?

But what about software? Security updates, free software, Google-less Android, privacy-respecting operating systems

Well, it would certainly make choosing and setting up a phone easier if you don't care about those things. But the FOSS community is producing images for many phones that otherwise would only run an Android built by the manufacture or carrier with all the usual insults like bloatware, pre-installed malware and other privacy-invading components. Using an older smartphone (maybe not a Nokia Communicator/Nokia 9xxx, but like maybe 10 years old) with current free software is certainly an option.

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