EZoFlash Willem programmer using Kicad
This is a build of the EZoFlash DIY parallel port programmer hardware (one of the many "Willem"-like or "Willem"-compatible or "Willem"-derived devices).
I created the schematics and PCB layout from scratch (based on the EZoFlash4v5 schematics) in the open-source Kicad EDA tool (GPL, version 2). The schematics files and PCB layout files are hereby released into the public domain. Do whatever you want with them.
Bill of materials
|1||ST BAT41||DO-35||100V||D10||0.54€||Schottky diode. Datasheet.|
|1||ST L7805ACV||TO-220||5V||IC10||0.63€||5V linear voltage regulator. Datasheet.|
|1||3mm LED (green)||T-1||—||D1||0.066€||—|
|1||3mm LED (yellow)||T-1||—||D3||0.066€||—|
|1||3mm LED (red)||T-1||—||D5||0.066€||—|
|1||TI SN74HC244||PDIP-20||—||IC5||0.454€||Octal buffer and line-driver, tri-state. Datasheet|
List of Willem-like devices
There are many, many parallel port programmer devices based on, or derived from, the original "Willem" devices in various PCB revisions.
Pretty much all variants are not compatible wrt their adapters and partly also wrt to features and layout and software and chip support, it seems.