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tandy.wiki/FLASH_23C1000

Replace a 23C1000 mask rom with a writable 29F010 flash, 28C010 eeprom, or 27C010 eprom.

This can replace the system rom on NEC PC-8300, PC-8401, and PC-8500

An updated version of the Atari 8-Bit MIDImate compatible SIO-to-MIDI interface board.

Arducon is a transmitter controller for Amateur Radio Direction Finding (ARDF). The project is based on the Arduino Pro Mini, and it includes everything needed to create printed circuit boards and executable software.

Teensy 4.1 Debugging

https://github.com/SpenceV1/Teensy_41_Debug_PCB

easily rearrange to-92 pinouts to match pcb footprints

Replica of the DEC 5016233-01-A1 PCB which is a 512 KiB RAM daughtercard for the DEC Professional 350/380 computers (from circa 1984).

DEC VR201/VR241 breakout board, rev B

DEC Professional 3XX 128/256/512/1024/2048 KiByte RAM Daughtercard, revision A

v1.0

Test board for MEMSIC’s (MCUBE’s) new ultra-low-power wake-on-motion 3-axis accelerometer.

This is a simple safe shutdown solution for use with the Raspberry Pi, OneForAll script, and Helder’s RetroPSU.

BOM:

• R1 - 470
• R2 - 1 K
• D1, D2, D3 - 1N4001 (or similar)
• Helder’s RetroPSU - https://www.heldergametech.com/shop/gameboy-zero/retropsu/

Resistors are 0805 and Diodes are SMA size

Software:

• OneForAll - https://github.com/Helder1981/OneForAll

Credit and Thanks:

All credit for this circuit goes to Gerrit Gazic and his simplyRetro Z5 project. Thanks goes out to Helder and Gerrit for spending entirely too much time helping me build this.

48V, 20A. 5V logic with 10V gate driver IC

V1 display board for ebike

This was originally designed for the E-Ale (Embedded Apprentice Linux Engineer) course for linux.conf.au 2019. These were used as teaching aids to help folks understand how to access various GPIOs, I2C, SPI, etc from the core Linux operating system. It’s designed to fit over the top of an rPi zero, though anything with a compatible 2x20 pin header should be able to make use of this board. It uses through hole modules for the individual sensors, making this fairly approachable for an individual to solder up. One thing to be aware of us the sub-assemblies do come close to the top of the 2x20 pin header, and you will want to make sure you are careful about potentially contacting the back of the 2x20 connector and the bottom of the assemblies (in particular the OLED screen has a tendency to have a component that’s very close, just be aware of that).

Honestly this is a great way to get a one stop smattering of being able to play with low speed i/o devices, and in an easy to solder package

using AUC logic and smaller components

C2: 0.047u for ~3.5 kHz, 1u for ~170 Hz

C1, C3-C9: 10u

R1: 6.8kohm

R2-R6: 220 ohm, lowest inductance possible (ERA-1AEB221C used – 0201)

U1: 74AHC1G14GW,125

U2-U7: SN74AUC1G17DCKR

In my build I added a 220uF electrolytic at the power input and added additional 0805 bypass caps directly across the power and ground of each gate (actually power and NC pin, as that is grounded).

LocoNet Shield for Arduino ProMini

LocoNet Shield for Meduino

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