51 Followers
92 Following
2.1K Posts

i do stuff 🏳️‍⚧️🏳️‍🌈

pronounced /ɭɛɳa/, not /ɭiɳa/

rust evangelist and train enjoyer 🚆🚂

fuck cars

antifa militant

this is my tech/serious/whatever account, for more personal stuff see @lena

pro nounsshe/her they/them
gayyes
sitehttps://lena.nihil.gay
lewd/nsfw/whatever@[email protected]
langrs, c, cs, cpp, js, ts, etc
langen, it, es*, fr*
twinkpadsX220, T410i, T61, T60, T60p, X60, T43, T30, T23
idea: Wi-FI SFP adapter
whoever at ST decided to put 2 power pins and 4 clock pins in the same spot, just know that i hate you and will wake you up in your dreams

this is the bottom board, there's a small print on the green connector holding the two boards together saying "28 MAR 1987".

you're supposed to program the message using that custom 16pin IDC connector, but i can't find any information about the circuit without tracing the PCB.

looks like this thing has been suffering for quite a while, there's lots of water damage here
the main LED circuit inside is composed of a SN74LS164N parallel shift registers from Texas Instruments followed by two SN7406N hex inverter buffers/drivers. If you've worked with these kinds of matrix displays before, you can probably guess how it works

from the italian text on the back, i think it's quite old, and there's also no information about this device on the internet. translated:

"Message kept in memory > 6 months"

"Max absorbed power: 36VA COSφ 0.7"

"recently" got my hands on this LED matrix display, "SAREMA VIDEO SPEAKER 150" for a few bucks. let's see what's inside

#hardware #electronics #led

don't
new board, let's start afresh
"m4 when???"