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11 Feb, 20 tweets, 6 min read
let's take apart this Apple keyboard!
model A1243. I don't really know their product line but... it's just a keyboard.
can't see any screws, maybe they're hidden under these rubber bumpers
uhh no?!
it's... stuck together with adhesive. not quite VHB bit something very stubborn. 🤦‍♂️
ok that was a real pain in the butt and i think I bent the thin aluminum plate in a few spots. probably should have used a heat gun too.
these are all 0402 passives. can apple use anything larger? there's plenty of room, but maybe these parts are cheaper for them.
this seems to be the keyboard controller. there's also a usb hub chip and a power supply.
the keyboard membrane unplugs quite easily. so that's nice
I can't really take this apart any further without getting destructive. the aluminum backing plate is spot welded to the frame in a million different places. 🤦‍♂️
well, from the other side, at least I can pop a key off. the trick is to pry up on the left side otherwise you'll break off two tiny little hinges.
did I say left side? each key seems to be unique. 😑 this one needs to be pried from the top.
the mechanism reminds me of a scissor lift.
some of the wider keys have a stabilizer bar so you can push the key anywhere and it won't rock side to side.
starting some more mischief
a numpad!
just the star key.
the membrane from that key looks pretty cool.
here's a cross section of a scissor-style keyboard keyswitch.
i've annotated the different parts of the mechanism. the tolerances are remarkably tight!

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More from @TubeTimeUS

12 Feb
i have a theory about the name of the iconic Roland TR-808 drum machine. the "TR" part stands for Transistor Rhythm but where does the 808 part come from? 🧵
but before we get to that, we need to talk about the Hammond Organ.
the Hammond Organ was a very unique instrument invented in the 1930s, and it was one of the first instruments you could call a synthesizer.
Read 42 tweets
11 Feb
here's a fun little part: it's a force sensor!
it uses a wheatstone bridge topology. you apply a voltage and measure the imbalance between the two resistor dividers.
looks like it is $90 each on Mouser! wow. mouser.com/ProductDetail/…
Read 7 tweets
29 Jan
so remember these IBM PS/2 fasteners that always break? the ones in the model 50 and model 70? i have found a source for the original parts!

they're still being made by a company called Southco! southco.com/en_us_int/
they make them in all different sizes, too.
Read 5 tweets
26 Jan
look what I got! Image
hmm I wonder if the CMOS battery is still good Image
Read 21 tweets
22 Jan
why are chips often so expensive? how do chip companies determine the prices of their chips? a thread... 🧵
first thing chip companies do is to figure out the COGS - cost of goods sold. this is how much it costs them to produce a chip--not counting profit or anything else.
but before we can calculate that, we need to know The Life of a Chip, start to finish!
Read 71 tweets
22 Jan
do you watch YouTube? i have a suggestion for you... 🧵
don't give in to the tyranny of The Algorithm, and don't let it choose which videos you watch.
here's a few things you can do:
✅no autoplay
✅run adblock/script block (ad networks often run malicious javascript!)
✅subscribe to YouTubers whose content you enjoy
✅click Subscriptions, and only watch that. no home page, no trending, no "up next"
✅support them on Patreon
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