A simple constant current LED driver with PWM control for replacing a filament bulb.
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README.md

Microscope Light Source

A simple PWM capable constant current source for a high brightness LED based around an ATtiny13 and an LM317 voltage regulator.

The board has been designed to be primarily one-sided, it should be possible to etch it DIY. This hasn't been tested though. The top copper layer only has a ground fill and the extra unused pins brought out to pads for possible use at a later date.

You can find out more here.

Mentioned here.