nano biscotte v1 led resistor

[theredeyejedi]

Hey every one, i have a quick question im having trouble answering my self by searching the forums and google. I want to hook up my ledengin dental blue 5w to a nano biscotte v1. Do i need a resistor to the led if i am using a 3400mah 3.7v 18650 battery?

[Forgetful Jedi Knight]

Yes, it's highly recommended.

[theredeyejedi]

Thank you. What resistor would you recomend if i want to run the led at 1500 ma ?the board puts out 2000ma if im not mistaken so would i need to do olms law to figure what resistor i need?

[Forgetful Jedi Knight]

Yes, you would need to use Ohm's Law. I wrote a tutorial on that and it's floating around here... somewhere..

[theredeyejedi]

Sweet i found the thread thank you!

[setelf3of5]

As FJK, and SS always say: Ohm's law learn it, and it will be your friend. I would only add, don't learn it and you will be spending more money on parts.

[theredeyejedi]

http://forums.thecustomsabershop.com/showthread.php?17109-Tutorial-FJK-s-quot-Down-and-Dirty-quot-guide-to-Ohm-s-Law&highlight=resistor+calculation

[setelf3of5]

Don't forget SS has a resistor Calculator in his signature.

[Silver Serpent]

I do. The one in my signature rounds up to the next standard resistor value, even if you could get by with a slightly smaller one. Using Ohm's Law is the best way to get your resistor value, but a calculator is nice to double-check your work.

[theredeyejedi]

LED calculator: current limiting resistor value
Source voltage 3.7
diode forward voltage 3.7
diode forward current (mA) 1500


The wizard recommends a 2.3 Watt capable or greater 1 ohm resistor. The color code for 1 ohms is brown black gold.
series connection diagram

would this be the correct resistor ?

[theredeyejedi]

is this correct?

[Silver Serpent]

That resistor will work fine.