LED Retro Lamp

I did a quick Christmas present for my brother. He found this old lamp and I converted it to LED with a micro-controller to do PWM dimming.



OLYMPUS DIGITAL CAMERAThe underside. Control knob at right is read by the Arduino Pro mini at left. Transistor at top of circuit board forms a constant current source with current set by large rectangular resistors and is switched on and off to do PWM by the Arduino.

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