'the recipient of the produce contained in this package agrees not to propagate or reproduce any portion of this produce, including "but not limited to" seeds, stems, tissue, and fruit.'
some folks think I faked it. it's real. it's even printed in French on the other side
as for the fruit itself? not that great, they're just too sugary for my tastes. but hey, i'd never had them before.
wiki has some more details on it. apparently it is patented. en.wikipedia.org/wiki/Cotton_Ca…
these grapes are 18% sugar. no wonder i don't like the taste. that much sugar just can't be healthy.
this is one of the world's first electronic calculators, the Friden EC-130, which came out in 1964! it's a really fascinating machine, so let's look at it in more detail. 🧵
you could buy it for about $2100 back then (about $20K now!) isn't it pretty though?
let's take a closer look at the screen. these are not LEDs or vacuum fluorescent displays, this is actually a CRT!
this neon lamp should never light up! there's a fascinating reason why... 🧵
ok so what is the circuit? this is a 3Com Etherlink card from the late 1980s. you can see the neon lamp in the lower right. actually there's a bunch of other interesting things going on but first, the neon lamp!
the circuit on the right side of the Ethernet card interfaces to the external AUI transceiver (the 15-pin D-sub) or a coaxial 10Base-2 network. the whole circuit is isolated by those two transformers, and i've put a red line so you can see no traces cross over.
this video landed in my youtube feed this morning. give it a watch, but try not to get too angry; there are some good lessons to learn. 🧵
this is the IBM 7496 Executive Workstation. i've never heard about it before, and it's probably quite rare. but rare doesn't necessarily mean valuable.
looking at the machine, it has some odd features. the tilted power jack is unusual; they must have run out of room in the case.
this desk fan is 85 years old and still running strong. how would YOU design an electronics gadget to last 100 years? what components would you use? what potential failures would you expect?
bonus: how would you make it last 200 years? how about 500 years?
thanks for all the responses. i noticed some interesting patterns:
✅assume humans are around the whole time, so make it easy to repair. *lots* of subtlety to unpack on this one.
✅material choice is critical
✅keep it as simple as possible, but as complex as is needed.
honestly i didn't think of the repair thing even though it may seem obvious. i guess i was thinking about a device that could survive 200 years in a dusty closet. but repair is very important!
this afternoon i built a really clever radio transmitter using a circuit i found in a book. it's really quite ingenious, so let's dig into it a little bit...
first, the book. it is "Communications Projects" in the Engineer's Mini-Notebook series by @fmims! i bought this maybe 25 years ago from Radio Shack.
here are the plans. i'll dig into the details of the circuit in a bit, but let's go through the construction a bit.