FreeTrack Forum

Welcome, you're not connected. ( Log in - Register )

RSS > LED Circuit Help

mattyh1986	#1 11/10/2010 - 22h50 Top
Class : Apprenti Posts : 3 Registered on : 11/10/2010 Off line	I am trying to make my LED circuit. I have... 3x http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=234-0940 Infa Red LED FWD V = 2 MAX FWD I = 100mA with a 9V battery and a 30omh resistor I am going in series... Battery > Resistor > LED > LED > LED > Battery I have wired it up and I get nothing, I have the longest leg as the + and the shoter leg as the - I noticed my resistor got very hot at one point. I am new to this and completely out of ideas.
h8196288	#2 26/10/2010 - 13h42 Top
Class : Apprenti Posts : 9 Registered on : 16/10/2010 Off line	Post some pics annotated? Might help with identifying the problem. Are all your connections good? Craig
tracker	#3 26/10/2010 - 15h01 Top
Class : Apprenti Posts : 26 Registered on : 09/10/2010 Off line	Uff. 9-2-2-2=3V. I=U/R I=3/30=100mA . You shouldn't use maximum ratings for led. Let say 1,5V for ir led and current around 50mA is sufficient. So you need 90 ohm resistor. Or use LM317 as in this topic: http://forum.free-track.net/index.php?showtopic=2666 You can leave out all capacitors. Edited by tracker on 27/10/2010 at 20h04.

> Stats

1 user(s) connected during the last 10 minutes (0 member(s) and 1 guest(s)).