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#vintageelectronics

2 posts1 participant0 posts today
Continued thread
The Gregzone

I looked up the display controller used by the SC-55’s display, and I suspected it follows the extremely common pinout and protocol used by most text LCDs of the era. I realized I have a display that will work, although the layout of the LCD elements is naturally totally wrong. So I wired it up, and it displays perfectly, confirming that the problem is indeed the SC-55’s display.

Unfortunately those are getting rarer and rarer to come by. There’s a small chance I can repair the existing display *if* I can identify the problem, find replacement ICs, and manage the very fiddly fine SMT desoldering/soldering that would be needed… but I may be better off just keeping an eye on eBay. #electronics #roland #soundcanvas #vintageelectronics #synth

The Gregzone

Made progress on getting the broken Roland SoundCanvas SC-55mkII that I got for cheap on eBay to work! I was fairly sure a clock signal (or rather the absence of one) was the culprit, and after poking around the board tracing clock signals I found a spot where one abruptly stopped.

Turns out a 40MHz low-pass filter was missing entirely from the board! After bodging it with a wire (since it’s just a filter, so the worst that happens is noise causes occasional problems), the unit came up! 🎉 But the display has issues. Half of it is dead, and the first letter of the instrument name is garbled. This appears unrelated to the first problem, and suggests an issue with the display board itself; all lines going to the display look good.

Given that another filter on the board was already bodge-wired, and a 455MHz crystal (only needed for the remote) was cut out, *and* given this display problem, I think this may have been a parts unit for someone.

#electronics#roland#soundcanvas
AlanGrassia

If you are getting started with servicing #VintageComputing gear or #VintageElectronics, you may be like me and scratching your head wondering about negative and positive sides/legs of capacitors.

I found the Identifying Capacitor Polarization page on DigiKey.com to be helpful.

digikey.com/en/blog/identifyin

DigiKeyIdentifying Capacitor PolarizationPolarized capacitors will always have a designator on them identifying polarity. This is important, because hooking one up backwards can be dangerous.
90s Script Kiddie

Hi I'm 90s Script Kiddie, I grew up online. I do #devops and #automation code stuff for my job. My hobbies are #gamedev, #vintageelectronics, #gaming, #repair ing stuff to keep it out of the landfill, old #apple hardware, #linux admin (I run my own mail, web, media etc servers) #network admin especially #pfsense, I love #books, #anime, #manga - reading in general really. #music too! Jazz, alt-rock, pop, folk, chiptunes... I also enjoy #cooking and am trying to get better at it. Beliefs-wise I'm something of an anarchist, yearning for a #solarpunk future I'll probably never live in, but I do what I can to do #mutualaid for the people in my circle. If you're my friend, I will set up all your electronics for you, replace the battery in your phone, give you some free mail or web hosting... whatever! I try to limit my consumption of news media for my own sanity, but I love reading about what people are doing in their own words. That's why I love the Fediverse, and it's why I'm lurking around on #gopher

I don't have a lot of friends. I've always been kind of a loner, and a little awkward. Luckily, I love my own company and have no problem spending time alone. Those few in my circle are people who I think make the world better by being in it.

I'm a #queer #bi #enby and I don't really give a hoot about what pronouns you use for me. Actually, I sort of feel like however you labeled me I'd want to break out of that box somehow. I guess I'm pretty contrary.

New #introduction who dis.

lpbkdotnet

Ok nerds! tell me about these things…

The “MR” designation denotes some kind of diode (it stands for Metal Rectifier, a notation hangover from before silicon/germanium diodes) and they’re obviously arranged as full bridge rectifiers

They’re in a PSU made for the British Post Office in 1972

The brown stripe seems to denote the + end, but what does the other stripe mean?

#Electronics#TelephoneExchange#Telephone
Continued thread
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Veronica Olsen 🏳️‍🌈🇳🇴🌻

Ok, I had to open it. The radio license sticker says 9 April 1951, but it isn't readable on the photo.

The radio has four tubes, and I'm pretty sure the four devices on a row on the left are the rectifier diodes. (Edit: nope, they're adjustable capacitors.)

It also seems to have 110V mode. 😊

#Radio#Vintage#VintageRadio
hugovangalen 🤖 🕹️ 😼

So, I was bored and figured I'd replace the backlight sheet for an LCD screen in an old 90s sampler. (I'd ordered the replacement in 2023.)

Boy, that was annoying!

I had to completely detach the metal bracket that snuggly presses the LCD screen and 2 zebra strips to the PCB; so I can desolder the old and put the new one in.

With all PCBs bare, I had to turn on the machine, and adjust and move the LCD until the 4 rows of text actually made sense.

#VintageElectronics#EMU#ESI32
No Context Pictures

1967

The image displays a collection of vintage electronic devices, showcasing various models and types from the mid-1960s.
Tags: vintage electronics, 1960s design, analog technology, historical gadgets, black-and-white photography

nocontext.loener.nl/fullpage/1

#photography #illustration #madman #nocontext #sfw #vintageelectronics #1960sdesign #analogtechnology #historicalgadgets #black-and-whitephotography

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