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| Current-limited LED circuit probe |
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| Bluechip:
T I've no idea whether this is applicable to what you propose, but you can get current limiting diodes that have a fairly constant current through them over a range of input voltages. Made by ATC - Semitec .. http://www.rapidonline.com/netalogue/specs/47-2600e.pdf Rather poor graph though. Not expensive here, so must be less in USA. :scratch: Looks a bit like the E562 or E462 covers sort of 3V to 20+V with a current of circa 5-10mA, enough for a LED. ?? Dave BC |
| John Swift:
just another idea for two or three terminal bi -colour leds a two transistor constant current circuit plus a few diodes |
| Brass_Machine:
--- Quote from: Tinkering_Guy on July 31, 2010, 02:09:12 PM ---SBH == Significantly Better Half :thumbup: --- End quote --- Ahhh! SWMBO = She Who Must Be Obeyed.... (my wife loves that one!) Eric |
| madjackghengis:
--- Quote from: John Swift on August 01, 2010, 09:01:30 PM --- just another idea for two or three terminal bi -colour leds a two transistor constant current circuit plus a few diodes --- End quote --- John, those are a couple of interesting circuits, looks like they'd do the job hansomely. Funny, about thirty years ago, working at an electronic burglar alarm company, we bought 2N2222s literally by the millions, for a factory with about twenty workers, building modules for the alarms we made. I never thought it would remain the premier transistor it has. I like your nice, simple and basic circuits that do the job with no fuss, and minimum parts to fail, I'll have to copy that set in one of my notebooks, nice job! :headbang: mad jack |
| Tinkering_Guy:
I echo the sentiments! I never seem to remember to try a bridge... :bang: |
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