Shared Projects

Simple Compact Flash/IDE interface for the NABU PC using a single SN74HCT32D, two resistors, and a .1uF capacitor.

This (untested!) version is intended for usage with the connection on the option adapter or floppy disk controller and requires an additional +5v connection.

Note, some adjustment of the resistors may be required in order to work reliably with your compact flash card.

2k/4k 2316/2332 rom socket to soic28 support non standard apple II rom

Simple Compact Flash/IDE interface for the NABU PC using a single SN74HCT32D, two resistors, and a .1uF capacitor.

Note, some adjustment of the resistors may be required in order to work reliably with your compact flash card.

• Since I don’t use thermistor. AIN pin is now connected to VBAT pad.
• Added solder pad for Alert pin. Require 200k external pull up.

MAX17050 Breakout board with Shunt resistor, Cap filters and I2C pullup with separated voltage. (Tested)

This is a replacement for the 80-wire IDE cable to use inside an Original Xbox. The design is not my own, but I wanted to share it with the community.

Added revision, re-routed power, moved RPI 1 mounting hole, added missing reference values. Couples uLCD32-PTU and RPI 1 - 3.

Inline board to connect between USBasp in-system programmer and the target board. It provides LED light feedback for host boards lacking LEDs and has a reset button and a jumper for doing special diagnostics on the host board when the hosts firmware supports it.

V2 Update to the Original I2C Character Display CPU Board. Identical to the I2C Character Display CPU V2 but with a reversed connector for the display. This is designed for OLED display modules that generally have their connector on the top edge of the PCB, whereas the original non-reversed version is for the ones with the connector on the side edge of the PCB. Otherwise, the two circuits are identical.

See the new I2C Character Display V3 board for a version with a higher powered MCU and better overall performance.

V2 Update to the Original I2C Character Display CPU Board. This board goes inline between a host CPU and an OLED (or similar) I2C/SPI graphical display. Its purpose is to convert the graphical display into a character-based display, removing the overhead of font rendering and pixel transfer over the slow I2C bus from the host.

Note that the CPU here is the ATmega328PB (PB version) with dual I2C ports. 12 MHz was chosen for the ceramic resonator, instead of 16MHz or 20 MHz, so that it will run at 3.3v within the specs given in the datasheet. You may, however, be able to overclock it successfully, especially if running at 5v. Be careful, however, of OLED displays with very noisy voltage inverters, as they will interfere with CPU overclocking. I managed to brick two ATmega328PB CPUs trying to run one with this board at 20MHz. 16MHz, however, was no problem.

An identical board with a reversed display connector is also available.

V2 Additions/Changes:

• Support for SPI communications with the display in addition to I2C

• Support for CPU Driven Reset Line to the display

• Support for either display driven or CPU driven I2C address (DC pin) option

• Ferrite bead on display power to reduce noise from the display’s power inverter

See also the Updated V2 version of this board which provides SPI display mode support as well.

Identical to the I2C Character Display CPU V1 but with a reversed connector for the display. This is designed for OLED display modules that generally have their connector on the top edge of the PCB, whereas the original non-reversed version is for the ones with the connector on the side edge of the PCB. Otherwise, the two circuits are identical.

ND6T AGC design for the uBITX as kitted by K5BCQ. http://www.nd6t.com/uBITX/AGCkit.htm

Eurorack mixer module - front panel PCB version 1.0.1

Holes only. No tracks, no pads.

Eurorack mixer module - controls PCB version 1.0.1

Eurorack mixer module - main PCB version 1.0.1

tandy.wiki/Teeprom

28C256 re-writable EEPROM module to fit into the Molex 78805 socket with non-standard pinout in TRS-80 Model 100, 102, and 200

For Trainer project. This is an Arduino Uno Shield that allows both an Arduino Uno and an Adafruit Trinket M0 control a peristaltic pump.

Power supply bypass and low pass filter for Sharp GP2Y0A41SK0F analog optical distance sensor. Recommended values are C1,C2: 10uf; R1: 160 ohms.