A while back I found one of these – a VT100 serial terminal from 1979 – on eBay for cheap. $40 and a whole lot of waiting later, I had it on my desk. I turned it on, and… nothing.
I expected this. The auction said it didn’t work. After tearing it apart and seeing what *could* be wrong, I found the switching transistor (yes, this thing actually used a switching power supply in 1979. It’s a really well engineered piece of equipment) was dead. If anyone knows where I can get an IR 92-O350 transistor – it looks exactly like this– drop me a line.
Instead of rebuilding the power supply with incredibly difficult to find parts, I found this tutorial for improvising a VT100 power supply with a normal, off the shelf ATX computer power supply. The circuit is fairly simple, although the non-volatile RAM in the VT100 requires -23 Volts. No big deal, just make a crappy linear supply for that.
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
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Python for Microcontrollers — Python on Microcontrollers Newsletter: Welcome to CircuitPython Day 2021! #Python #Adafruit #CircuitPython @micropython @ThePSF
Adafruit IoT Monthly — Forest Fire Beacons, IoT for Beginners, and more!
Microsoft MakeCode — MakeCode for the micro:bit - 2021 Release!
EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey
New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — JP’s Product Pick of the Week — 4pm Eastern TODAY! 8/3/21 @adafruit @johnedgarpark #adafruit #newproductpick
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