Version 3

This release removes R2, which was not needed, and adds a second screw hole which might be useful for fixing the board.

Function-wise there is no change wrt previous versions.

Note that this board was designed for transistors with an EBC pinout, such as PN2222, PN3904, etc. CBE transistors, (such as BC547, BC337, etc.) can be used as well, provided that they are installed in the reverse direction (i.e.: flat side towards the bottom). Any NPN transistor with an Ic (collector current) of at least 100 mA will do. Note that P2N2222 is CBE.

I have never tested this board personally, but many people all over the world have done so successfully. It was even the subject of a YouTube video by Project Geek.

NOTE: This release includes an unofficial BOM with Digi-Key part numbers, contributed by Jeff Pace and corrected by MagerValp (thanks!). I'm sure they did a good job, but I haven't checked it personally, so use at your own risk.