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Use an emitter follower circuit, or better yet, a pulse-width modulator. You can control the brightness all the way from off to max, with no smoke signals. I modified an old trolling motor with an emitter follower to get a variable-speed control. Works very well. MAKE SURE you get a transistor rated for at least 1.5 times the max current the light will draw, and mount it to a large heatsink (any good-sized finned chunk of metal will work, in most cases)

[QUOTE="DTB Radio, post: 42472, member: 754"] Use an emitter follower circuit, or better yet, a pulse-width modulator. You can control the brightness all the way from off to max, with no smoke signals. I modified an old trolling motor with an emitter follower to get a variable-speed control. Works very well. MAKE SURE you get a transistor rated for at least 1.5 times the max current the light will draw, and mount it to a large heatsink (any good-sized finned chunk of metal will work, in most cases) [img]http://www.dtbradio.com/miscpics/emitter-follower.gif[/img] [/QUOTE]

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