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Resistor for LR3C-14 and CML LED indicator for low voltage

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pmnewlon

Joined: 20 Jan 2011
Posts: 21

Posted: Mon Jul 23, 2012 3:26 pm Post subject: Resistor for LR3C-14 and CML LED indicator for low voltage

http://www.cml-it.com/DEBD/index.php?p=34&a=19030252&b=1725&c=62#Galerie



I have installed several yellow and red CML LEDs for various indicator functions.  These devices have built-in internal resistors - just hook the appropriate + and - connectors and you are good to go.  Almost.  As with so many others, my LED is constantly 'on' and flashes when voltage drops - as designed.



I found Bob's sketch for attaching an LED to the LR3C-14 using two 470 ohm resistors.



http://aeroelectric.com/Pictures/Schematics/LR3_LV_Led_1.jpg



What I don't know and could use some direction on, is since my LED module already has built in resistor, which resistor do I add to the circuit to keep the LED from illuminating at all times?   Or do I still use both? Same values?  I have not found a schematic for the CML device anyplace to help shed any light on the subject.



Thanks!  Phil

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