here's a fun chip! giant 64-pin package with the die mounted on the *bottom*
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here's a fun chip! giant 64-pin package with the die mounted on the *bottom*
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Phoenix Gee
@tubetime This is a weird one. Only pops up with a lot of aviation related hits, but NOTHING specific, let alone a spec sheet or something. Edit: Found something on a Russian parts site where it is listed under i/o relay modules.
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benjaminit
@tubetime you realise the world will end because each and every one of those hasn’t got something covering the windows.
Tube🌱Time
simple and fun rework. this pin was grounded but needed to be tied to a signal. I removed the solder and added some glue to insulate it from the pad, then soldered the wire on.
RealGene ☣️
@tubetime
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think i'll figure out how to refill these old HP plotter pens.
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Marc has a video about his technique. i tried it with one pen but it's a bit labor intensive, and a commenter on his video found a better way!
Darryl Ramm
@tubetime Philip Freidin modifies a pilot? pen that happens to fit almost exactly. IIRC he takes a little shave off them in a lathe. Not sure what exact pen he uses. I suspect that gives you a lot longer use time, but then the long pen won't work on a carousel.
Nick Burns
@tubetime know of a good source on how hook one up to a modern computer? I have a big old HP plotter but I’m not really sure where to start
Tube🌱Time
the whole threads federation thing reminds me of when AOL put everyone on the internet
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Tube🌱Time
fun fact! the numbers in coin cell part numbers are dimensions. a CR2025 is 20mm diameter and 2.5mm thick!
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Irenes (many)
@tubetime is it not... shorted through the calipers, when held like that? well, you probably only did it for a moment
Tube🌱Time
New release: the Goodgreat DS3, the Apple II sampler card i reverse engineered from an album cover! Download the design here: https://github.com/schlae/goodgreat-ds3
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Daniel Neuman
@tubetime What a nice rabbit hole! I found that you can download some Mainframe music as mp3 from here for free.
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got a new mini-project: this is the AMTRADE "The Real HD-Drive" which is a PC floppy drive with this board on the back enabling an Amiga to read high density floppy disks (1.75MB).
Tube🌱Time
to get the Amiga to work with high density disks, the Commodore engineers took a little short cut and just spin the drive at half the normal RPM (150 instead of 300). this keeps the data rate the same, allowing the custom chip to remain unchanged.
Chartreuse
@tubetime the solution is to get more breadboards. You never have enough for a computer project.
Tube🌱Time
something wrong with this publication? then...jot down the dope about it on this form, carefully tear it out, fold it and drop it in the mail.'
Darryl Ramm
@tubetime I expect the Army received many notes from lonely radar technicians asking for Ms. "Jot down the dope" contact info. 🤷♂️
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it's the first electronics flea market of the year here in silicon valley! (electronicsfleamarket.com)
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Brian Swetland
@tubetime Added the upcoming ones to my calendar in hopes of finally checking this out sometime.
Tube🌱Time
i cracked it open and this is what the die looks like. some sort of memory array, it could be SRAM but who knows.
rail :neofox_flag_nb: 🌿
@tubetime idk what it is but it looks oddly cute and i just don't know why silly little goober of a chip uwu
Tube🌱Time
oh look it is the 74C915 7-Segment to BCD converter. under what circumstances would you use this? i can think of at least two.
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Christian Berger DECT 2763
@tubetime An oddball thing to use this is to read data from video signals that are either generated by a camera pointing precisely at a 7 segment display, or one of those early "consumer" OSD chips that use 7 segments.
Tube🌱Time
i've designed this cute little board that plugs into a solderless breadboard. it is a pulse generator! the frequency range is from 1Hz to 1MHz. the duty cycle is adjustable as well. it also has a built-in voltage monitor that generates a reset pulse for your microcontroller or CPU. design files are here: https://github.com/schlae/BreadboardGadgets/
Anthropy :verified_flashing:
@tubetime neat, I've always wanted to test if I could hear 1MHZ :blobcatgooglyfingerguns: seriously though I bet that's very useful for quite a lot of different projects ranging from reviving old electronics to hardware mod overclocking to pleasantly gimmicky synthesizers
kuchenblechmafia
@tubetime
Tube🌱Time
another delightful video from Posy! his videos always have excellent macro photography.
xek
@tubetime Speaking of Posy-adjacent things, did you see that someone actually made some of his displays? It's a cute demo of a company's new display-printing tech: https://www.youtube.com/watch?v=jz01j1TpM84
Jeff Haluska
@tubetime I love his video/editing style. I'm far from an audiophile or a collector and I still want one. Just a great collection of facts and engineering explanation.
Tube🌱Time
this chip has color-coded stripes printed underneath it. what do you think it means?
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@tubetime regular ceramic, or the toxic high heat dissipation military-grade stuff?
@tubetime It's so that it's more convenient to sharpen knives on them!
@tubetime almost thought that was a z8000