Quote:
Originally Posted by skyl4rk
Running 4 of these LEDs would require a voltage of just under 13.2V. They might work on a 12V battery, depending on your battery state of charge. The LEDs would dim as your battery voltage dropped. However when you turn a battery charger on, there would be voltage over the rating for these LEDs.
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There are on-line programs for building lm317 regulators on the web.
I built one last July..
http://ecorenovator.org/forum/projec....html#post7318
And, there are wiring diagrams & component layout info too.
Building this supply should be pretty easy for novice techs.
However, if the 317 gets hot, you might want to think about a heat sink.
Anyways, heating up a regulator chip is actually wasting power,
when you could just stick in a 4th LED..
And of course don't try to charge your battery!
I'm thinking a 4-LED 12v lamp for battery only. I have a big lug-able
12v LA battery that we use during short grid failures.
http://i46.photobucket.com/albums/f1...Solar/r068.jpg
Normally it has a 12v halogen lamp plugged in, but I think 4 LEDs
might give more light for less watt hours.
