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RSS > Need help with resistor, Could not figure out the calculator

Circleplanes	#1 19/08/2013 - 20h55 Top
Class : Apprenti Posts : 3 Registered on : 19/08/2013 Off line	Hello I need help. I am not confident in what I am doing. I want to build a 3 led cap. The equipment I have are 3 SFH485P LED 1.5v forward voltage 4.9VDC Sony Ericsson power supply This is the one I have "CST-13" I tried the calculator for a resistor value but it gave a calculation for parallel assembly. I wish to connect them in series. I have two resistors on hand and they are 4.7 Ohms 5% and the other one is 2.9 Ohms 10% Can I use either one of them? Thank you so much. Edited by Circleplanes on 19/08/2013 at 21h16.
moss	#2 20/08/2013 - 02h15 Top
Class : Apprenti Posts : 7 Registered on : 14/08/2013 Off line	If the LEDs work with 50mA ( http://www.free-track.net/forum/index.php?showtopic=1856 ) The way to solve the circuit is this: In your case you can use the two resistors in series, they will work as one resitor of 7.6 Ohms (4.7 + 2.9) Good luck.
Circleplanes	#3 20/08/2013 - 09h37 Top
Class : Apprenti Posts : 3 Registered on : 19/08/2013 Off line	That looks good thank you for the help. I will try it like that using two resistors

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