@bornach@fosstodon.org
@bornach@fosstodon.org avatar

bornach

@bornach@fosstodon.org

I like hackspace stuff, STEM education, discrete electronics, microcontrollers, Raspberry Pi, kinetic art, electronic music synthesis

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NanoRaptor, to random
@NanoRaptor@bitbang.social avatar

The one true USB3 connector.

bornach,
@bornach@fosstodon.org avatar

@colinstu @disser @NanoRaptor
That's how you know it's fake. The USB committee would not have centered the solid bit in the middle of the equilateral triangle so that only 1 out of 6 orientations actually fits

Edit: just checked Alt text. Well played!

bornach, to random
@bornach@fosstodon.org avatar

[denha] has made a new version of his marble catapult
https://youtu.be/MHkeoV0xpSk

The mechanism is so mesmerizing (requires viewing in slo-mo) I could watch for hours. Makes me want to build my own version so I can finally put to use the bag of tiny springs which my Dad had harvested from various printers and tape players over the years

ElleGray, to random
@ElleGray@mstdn.social avatar

deleted_by_author

    •
    bornach,
    @bornach@fosstodon.org avatar

    @selzero @ElleGray
    ๐ŸŽถ "It's getting hot in here
    Cuz I'm wearing all my clothes"
    https://metro.co.uk/2015/07/10/dude-passes-out-on-easyjet-flight-after-wearing-12-layers-of-clothes-to-avoid-excess-baggage-5289189/

    bornach,
    @bornach@fosstodon.org avatar

    @fullfathomfive @ElleGray
    I remember having one of those in the bathroom while growing up

    bornach,
    @bornach@fosstodon.org avatar

    @ElleGray
    It was Miss Black with the Lead Pipe in the Conservatory

    bornach, to instagramreality
    @bornach@fosstodon.org avatar

    operational transconductance amplifiers I bought on over 6 years ago. Date code doesn't make sense given that Intersil discontinued the over a decade ago. The real chip should have a diode across pins 4 and 5. Only one chip seems to have it -- but it is reversed. The rest have resistors between pins 1 and 4, and between 4 and 5, consistent with an op amp that provides offset null pins. Pin 8 also seems to be connected. Both 1 and 8 should be NC.

    bornach,
    @bornach@fosstodon.org avatar

    Someone has decapped one of these fake CA3080 ICs that have been selling on EBay as early as 2011.

    https://huebnerie.de/2011/01/beware-of-the-fake-ca3080e/

    The die mask claims to be LM4250. I already destroyed 2 of them trying to guess the pinout, but using the pinout of the LM4250 seems to work with 7 of them. They behave just like a jelly bean op amp.

    bornach,
    @bornach@fosstodon.org avatar

    I very much doubt they are actually LM4250 ICs given the all too common practice of mislabelling cheap clones of well known op amps. [IMSAI GUY] shows a few of the die masks that have been found inside many of these fake op amps
    https://youtu.be/NSgqYLLPUSs

    bornach,
    @bornach@fosstodon.org avatar

    At least the single rail #opamp #oscillator circuit works with these counterfeit chips. Maybe I'll turn them all into #LED blinkies and Schmitt triggers.

    #electronics

    Fake OTA chip in a solderless breadboard wired up with resistors, a capacitor and a purple LED which blinks about 1-2 times a second when powered by a 9V battery

    trevorflowers, to random
    @trevorflowers@machines.social avatar

    I kind of love the messed up mechanisms spit out by Midjourney.
    How many hairsprings and escapement wheels does this thing have?!

    bornach,
    @bornach@fosstodon.org avatar

    @trevorflowers
    Didn't someone already make such a website?

    It's called Etsy
    https://www.theatlantic.com/technology/archive/2023/06/ai-chatgpt-side-hustle/674415/

    bornach,
    @bornach@fosstodon.org avatar

    @trevorflowers
    Training data must include watches from Aliexpress
    https://youtu.be/QOdusPcfhHA

    rdearman, to random
    @rdearman@toot.io avatar

    Random Advice: Don't text and drive; focus on the road.

    bornach,
    @bornach@fosstodon.org avatar

    @rdearman
    Need to update the phones in this PSA

    CW: depiction of graphic injury and death
    https://youtu.be/R0LCmStIw9E

    Lots more ways nowadays for smartphones to distract drivers that don't involve texting

    arturo182, to random
    @arturo182@mastodon.social avatar

    It's time to make conference badges with two holes and lanyards with two clips the standard, otherwise half of the time the badges are hanging backwards because they're not designed with weight distribution in mind

    OHS 2023 badge
    OHS badge

    bornach,
    @bornach@fosstodon.org avatar

    @arturo182
    Or use lanyards by @geekmomprojects so you can power the badges via bigger batteries without adding more thickness to them
    https://www.geekmomprojects.com/3d-printed-wearable-battery-holder/

    bornach, to Electronics
    @bornach@fosstodon.org avatar

    The DC rails on this failed switching power supply from a wall wort AC adapter, were shorted together. It could be one of 4 components: 2 electrolytic capacitors, a surfacemount ceramic capacitor, or a surfacemount Schottky diode. Started desoldering each one and testing for the short. It cleared when the Schottky diode (SK26) was removed

    I don't think I have a high current replacement diode in this form factor.

    bornach,
    @bornach@fosstodon.org avatar

    I do have a 1N5822 Schottky

    Comparing datasheets
    SK26 60V 2A
    1N5822 40V 3A

    The voltages on this side of the switch mode power supply are not expected to be much higher than 12V DC. This wall wort is rated at 600mA 7.2VA. The electrolytic caps are only rated up to 16V

    Will it work?

    bornach,
    @bornach@fosstodon.org avatar

    And the deed is done!

    Unfortunately it still doesn't work. LED doesn't light and still reading 0V on the DC side. Something else on the PCB must have failed. The 1N5822 still seems fine so perhaps the SK26 had failed first and took out other components.

    Probably will just scrap it for parts. These wall worts cost ยฃ12 at Asda if I ever need new one.

    The electrolytic capactitors and diode have been soldered into the power supply PCB.

    bornach,
    @bornach@fosstodon.org avatar

    Desoldered the power MOSFET (N-Channel 2N60F) which still seems to be good. Not quite logic level but I might find a use for it in a project.

    One of the surface mount signal transistors might have failed. I won't bother desoldering those as I already have so many.

    joeycastillo, to random
    @joeycastillo@mastodon.social avatar

    https://mastodon.social/@NanoRaptor@bitbang.social/112330107070682480

    Tag yourself, Iโ€™m

    bornach,
    @bornach@fosstodon.org avatar

    @brouhaha @joeycastillo
    https://tenor.com/b13fi.gif

    bornach,
    @bornach@fosstodon.org avatar

    @joeycastillo
    Must have hit a poisoned mushroom
    https://www.lexaloffle.com/bbs/?tid=36757

    Pico-8 version of Atari arcade classic "Centipede" When the green centipede hits a poisoned mushroom it dives towards the player area at the bottom of the screen

    18+ gadgetoid, to random
    @gadgetoid@fosstodon.org avatar

    Iโ€™d say it came out okay

    bornach,
    @bornach@fosstodon.org avatar

    @gadgetoid @_thegeoff
    So this was really what you meant when you said you'd post "keebs"
    https://fosstodon.org/@gadgetoid/112344893935460193

    bornach, to ElectronicMusic
    @bornach@fosstodon.org avatar

    A.I.
    Analog Ingenuity
    https://youtu.be/2oXJt70wbvk
    #electronicMusic #KomaFieldKit #LeslieSpeaker

    dannotdaniel, to random
    @dannotdaniel@mastodon.social avatar

    This raven flew by nice & close, 2 weeks ago

    same raven, wings in lower position

    bornach,
    @bornach@fosstodon.org avatar

    @dannotdaniel
    Did it sit on a bust above your door?

    Did it cast a shadow on your floor?

    Did you ask it for its name?

    jonty, to random
    @jonty@chaos.social avatar

    You know the "repeat the previous text" trick to get initial chatbot prompts?

    This variant sure makes it look like Bing Copilot GPT4 is leaking state between user sessions. I have never used copilot before.

    bornach,
    @bornach@fosstodon.org avatar

    @m @RichardOliver @jonty

    This "entrepreneur" claims that building his Minimum Viable Product would cost him the same as 46449 bananas laid end-to-end

    https://www.reddit.com/r/Entrepreneur/comments/1cdxxzb/how_i_built_an_mvp_without_breaking_the_bank_and/

    notenoughtech, to random
    @notenoughtech@mastodon.world avatar

    I had a chat with Kevin at . We looked at robots and had a giggle together. Here is a teaser from our talk.
    More coming up soon on my YouTube channel
    https://youtube.com/shorts/U9KZZ7_s0JM

    bornach,
    @bornach@fosstodon.org avatar

    @notenoughtech
    For a moment there I thought had already happened this year and somehow I hadn't noticed
    https://youtu.be/0AIYD25Es2M
    [NotEnoughTECH] finally released his video

    yurnidiot, to Starwars
    @yurnidiot@mstdn.social avatar

    what it might look like if the uss enterprise went up against the empire.

    a star wars vs star trek fan trailer.

    video/mp4

    bornach,
    @bornach@fosstodon.org avatar

    @notroot @yurnidiot
    Federation shields are unable to stop that Force suffocation trick though
    https://youtu.be/RgHhUZt8j98

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