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LED wiring into 12v switch

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=83602
Printed Date: May 08, 2024 at 8:45 PM


Topic: LED wiring into 12v switch

Posted By: devile
Subject: LED wiring into 12v switch
Date Posted: October 02, 2006 at 11:55 AM

Ok i have a single blue LED that i want to use as a light that turn on when i turn the switch on indicating that the thing the switch is controlling is on. Now can i just run a positive to one side of teh led and a negative to the otherside or will that kill the led... Please let me know what i need to do... Thanks



Replies:

Posted By: Big Dog
Date Posted: October 02, 2006 at 12:24 PM

You need to add a resistor in series. The value depends on what are your LED's voltage and current requirements.

Take a look at this https://www.the12volt.com/installbay/forum_posts.asp?tid=81477&PN=2



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Prepare your future. It wasn't the lack of stones that killed the stone age.



Posted By: silverado42000
Date Posted: October 02, 2006 at 12:29 PM
you need to put a resistor on the LED 470 Ohm, not thats if the blue LED uses 3.5V and 20milliamps

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