LED wiring into 12v switch

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devile

Member - Posts: 45

Joined: November 27, 2004

Location: Canada

Posted: October 02, 2006 at 11:55 AM / IP Logged

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

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Big Dog

Gold - Posts: 1,265

This member consistently provides reliable information

Joined: May 02, 2002

Location: Quebec, Canada

Posted: October 02, 2006 at 12:24 PM / IP Logged

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

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

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silverado42000

Copper - Posts: 65

Joined: September 25, 2006

Location: United States

Posted: October 02, 2006 at 12:29 PM / IP Logged

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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LED wiring into 12v switch

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