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#electronics

86 Beiträge63 Beteiligte5 Beiträge heute
DJ🌞:donor:

Hey all, sorry it has been a while for the #nakeddiefriday due to health reasons, but here we come again!

Today's guest of honor is one made by intel, the 80286! This is an NMOS sample, but CMOS versions exist too (I got no samples yet). One metal layer only! I also deprocessed the sample to fully expose polysilicon and diffusion layers. Let's have a look?

Many thanks to @gloriouscow for supporting this work!

SiPron page: siliconprawn.org/archive/doku.

#electronics#reverseengineering#retrocomputing
Riley S. Faelan

Hey #electronics / #retrocomputing Mastodon,

I really like this kind of protoboard layout. What is its name, if I wanted to order some from Mouser or Digi-Key?

You'll note that:

  • there's a number of gutters, with all THT chip holes immediately connected to a hole for a wire;
  • this particular version has mostly gutters for 3din chips, with a couple of wider gutters for 6din chips at the right end;
  • there's a gold-plated edge connector at the edge of the board, with ach pin having a convenient soldering hole next to it.

Since edge connectors have gone a bit out of the fashion, i could also do with a now-common header pin connector, preferably a two-row one. It would also be nice for the card to be in an Eurocard-compatible size, but, hey, it's a prototyping board; it wouldn't be a big problem for it to be in a weird size or shape.

Matt

Here is an old radio that I still use as a speaker. It's a Westinghouse that was made in Canada late 1950s that was found in a shop near Niagara Falls. I use it to listen to audiobooks and stuff

The amplifier was rebuilt from scratch with a 2W LM386 and I added a power+AUX input, but the speaker itself is original. There's an internal USB line inside the cabinet that can supply power to Bluetooth adapters

#throwbackthursday#electronics
brett
The only calendar I've ever been able to use long-term (8 years!) is a giant whiteboard with 12 weeks of dates on it, that only requires updating every couple of months.

I now need to get the Internet involved, so I bought a cheap projector, recreated my calendar in Python, and wired it into the home automation.

When I first wake up, Node-RED will trigger a Raspberry Pi to check for new calendar invites and if there are any it'll turn on the projector and display the new calendar for 10 minutes before turning the projector back off.

Did the final touches today including building the IR blaster circuit and 3d printing a case to hide the Pi under the table.

#projects #electronics #homeautomation #nodered #3dprinting
#3dprinting
eyes

Just learned about this sick feminist hacker group that made a technique for creating PCBs out of locally harvested clay instead of plastic! Ofc the PCBs will have to be pretty simple, but ill bet you could totally make an arduino with this!

Really want to test this out and do a workshop at Sandbox (our local hackerspace) if this works!

feministhackerspaces.cargo.sit

feministhackerspaces.cargo.siteClay PCB Tutorial — feministhackerspacesClay PCB Tutorial MaKING Printed Circuit Boards with Wild Clay It is an open secret that the hardware in our...
#solarpunk#electronics#permacomputing
Søren Kjærsgaard

Occasionally it can be a good idea to add an in-line diode to protect a power supply used to charge a battery.

You want the resulting voltage drop as low as possible which calls for a high-power Schottky diode. The STM STPS5L60 is a 60V diode, rated at maximum 5A continuously. As I’ll be charging at maximum 3A, I decided to test the voltage drop and resulting case temperature at that load.

I measured a 0.38V drop, resulting in about 1.15W dissipated - not bad 😃

The outer case temperature rose to about 57C which is fully acceptable and way below the diodes limits. And it’s touchable as well, which is nice.

So, charging a LiFePO4 battery for my #hamradio #SOTA and #POTA operations, I’ll set the supply to 15V, limit the current to 3A, and the battery’s built in BMS controller will handle the rest, easy! 👌🏼🙂

For the record, I always keep an eye on it when charging and I usually reduce the current by the end of the charge cycle ☝🏼

#electronics#electronicsengineering#hamr
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