Shared Projects

This is a PS/2 to Mac Plus mouse adapter. It uses an ATtiny806 to convert the data stream and button events between the two. The code to support this adapter can be found on my github repository.

• The microcontroller is an ATtiny806 in a VQFN package.
• The 10u and .1u capacitors are in a 0603 package.
• The PS/2 adapter is a Kycon KMDGX-6S-BS
• The RJ10 jack is an Amphenol D09P33E4PA00LF
• The code for this project is based on glitterkitty’s Arduino-PS2-Mouse-to-Amiga-Adapter project.

This adapter may also work with a Mac 128, 512, and Apple Lisa.

Adaptor “shield style” for Nucleo F439ZI to allow use as an ethernet to GPIB interface.

tx board for universal transmitter; modified from HowToMechatronics. [draft]

Updated board design for PoE project.

This is a PS/2 to Mac Plus keyboard adapter. It uses an ATtiny806 to convert the scan codes between the two. The code to support this adapter can be found on my github repository.

• The microcontroller is an ATtiny806 in a VQFN package.
• The 10u and .1u capacitors are in a 0603 package.
• The PS/2 adapter is a Kycon KMDGX-6S-BS
• The RJ10 jack is a Wurth Elektronik 615004143821
• The code for this project is based on trekawek’s mac-plus-ps2 project.

The RJ10 cable that connects the adapter and keyboard must be a pass-through cable like what was used with the original keyboard. RJ10 telephone handset cables, while they fit the RJ10 jack, are crossover cables. You would need to cut and re-crimp one end of such a cable in order to make it work with this adapter. Otherwise you risk damaging your Mac and this adapter.

You may find some sellers on eBay who produce such cables specifically for the Mac Plus. Alternatively you could make one yourself (as I did) with these items:

• Telephone Handset Cord 2-Pack
• Transparent RJ9 Telephone Cable Plug
• Multifunction Ratcheting Crimper for Web and Phone

NOTE: RJ9, RJ10, and RJ22 are all basically the same thing. They are all 4P4C (4 Position 4 Conductor) connectors and will fit the Mac Plus and this adapter.

VR Energy Harvest to Pulse Converter (test concept)

RC Hourglass transponder v3, same as V2, just the part references matches the original RC Hourglass transponder schematic from Github. Includes prog terminal at the bottom and slightly smaller footprint. Play around with C4 for best TX performance, a value around 130pF is recommended

firmware: https://github.com/mv4wd/RCHourglass Note: This is open source based on the work of Howard Cano and Marco Venturini. Please support their work by donating €5 for each built transponder to some child charity.

R1, R2 = 5.1K, 1%, 0603 (in) package

USB Type-C, 6-pin power connector, no data

This is an Arduino shield, sketch, and companion Python application to read from and write to ROM-el 2364 devices.

Breadboard-compatible breakout board for the LM66200.

Texas Instruments LM66200 is a dual ideal diode device with a voltage rating of 1.6V to 5.5V and a maximum current rating of 2.5A per channel. The device uses N-channel MOSFETs to switch between supplies while providing a controlled slew rate when voltage is first applied.

Due to its low quiescent of 1.32µA (typical) and low standby current of 50nA (typical), the LM66200 is ideal for systems where a battery is connected to one of the inputs. These low currents extend the life and operation of the battery when in use.

BOM

• LM66200
• 1x04 pin headers or sockets (optional)

Spins the Matrix Portal connector around 180 degrees to contain the board in the shadow of the RGB panel.

See here for the latest version: https://oshpark.com/shared_projects/ng0CfMmy

Charging board for a Dualshock 4 EXT connector, with support for both micro USB and USB type C ports.

For more info, see https://qubitsandbytes.co.uk/dualshock-4-ext-port-charger/