Reply to "Easy Directional Leds for Diesels or Electrics"

Rod StewartOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

I decided to play with the CL2N3 drivers to see if there is any advantage to using them. Here's the circuit:

The 1N4007 diodes are added to block the reverse polarity. So one set of CL2N3 plus 1N4007 drives the red, and the other side drives the green. I initially had the leds in series but the required voltage to make them bright was too high, so parallel leds got the nod. The minimum required voltages to reach steady intensity are 6.5 and 7.5 for red/green respectively using this setup. Higher voltages right up to 24vdc don't affect brightness. I experimented removing one 1N4007 diode, and poof! Splash two leds, which I kind of expected. The CL2N3's both survived though.

The real question is; for a typical two can motor diesel, what is the needed voltage for them to start moving?? Anyone know? If its much less than the voltages above, the leds are still going to vary in brightness, which might not be good. eek

Rod

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