At 03:25 AM 10/5/2001, Andrew Grebneff wrote: >LEDs can be run through a rheostat (or electronic equivalent) to vary >their intensity. I asked an electronics expert, as I plan to change >my instrument lighting to backlit by several selectable sets of Just make sure that there is sufficient (permanent) resistance in the circuit to limit the maximum current to some acceptable value. Most LEDs can handle 20 milliamps if the temperature is reasonable. If you want to do it right, get ones with known specs and adjust the limiting resistors to meet the spec. Side note -- unlike incandescent bulbs, LEDs will light dimly with extremely small currents. My oil pressure LED, for example, is a super-bright poke-your-eye-out clear red LED -- in the dark I can barely see it glowing from leakage current that I doubt is more than a few microamps. david
David Beierl - Providence, RI http://pws.prserv.net/synergy/Vanagon/ '84 Westy "Dutiful Passage" '85 GL "Poor Relation" |
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