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Post by gdouaire on Apr 5, 2015 21:05:13 GMT -6
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Post by gdouaire on Apr 10, 2015 6:41:43 GMT -6
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Post by sall on Apr 10, 2015 7:27:27 GMT -6
They won't last forever current limited for 12v. The resistor should be set for 14.4v or whatever the max voltage that is seen on the circuit is. I doubt is 12v regulated from the factory. They will last a while though. Right now they are likely being over driven which will cause premature death. Just ask awehlage, I'm sure he will stand by that statement having converted his interior and had a couple fail with set resistor for 12v. Along with other who have converted interior with cheap eBay LEDs with under rated resistors. Most of those 12v internally resistored LEDs use 1/8W resistors which is not sufficient either. If you have a white led at 3.0 forward voltage with max current to be driven at 20mA one would need a 470 ohm resistor 0.25W resistor. At 14.4 volts the same LED with 470 ohm resistor will be driven at 25mA. Which is over current and will lead to decreased life. How much less depends on the quality of the LED to begin with.
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Post by gdouaire on Apr 10, 2015 16:00:32 GMT -6
Maybe a +12v Zener diode in parallel of the LED would keep the voltage stable. If these LED burn, I'll go that way.
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Post by sall on Apr 10, 2015 21:23:56 GMT -6
You can snip the traces and solder in an smd diode or as you say a diode to drop the voltage a bit more. Should still last a while though,
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Post by gdouaire on Apr 11, 2015 5:37:55 GMT -6
Or a zener diode to regulate the whole interior light circuit at 12v, right at the source - presumably near the potentiometer to adjust the brightness of the lightning.
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Post by sall on Apr 11, 2015 7:53:52 GMT -6
I built a slave LCM/BCM a couple years back and used a voltage regulator to drop everything down for the interior. Though the actual controller has several more functions as well.
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