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Subject: Re: Need to drive LED's from 12v source

Date: 10/21/02 at 7:01 PM
Posted by: Ned Stevens
E-mail: k7elp@xmission.com
Message Posted:

In Reply to: Need to drive LED's from 12v source posted by Marcus on 10/20/02 at 7:30 PM:

Marcus,
I'll be glad to help you. If the source voltage is going to always be 12 volts. The hookup is quite simple. Use the formula 12-(LED voltage)/10mA. The result will be the value of the resitor to use in series with the LED. Connect the resistor to the + (long) lead of the LED, and the other end of the resitor to the + 12V. Connect the - lead of the LED to the -12V lead. If you plan to use white LED's the LED voltage will be 3. If you want the LED's to be on as the voltage varies from 0 to 12 volts that is another problem. Please be more specific about the color of the LED's and what color of LED


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