Single standard LED with 12volts

Posted by: TCPMeta

Single standard LED with 12volts - 03/14/08 05:46 PM

Anyone know the type of resistor is needed for turning a standard LED 3 or 5 volt to handle 12 volts?
Posted by: soundmann18

Re: Single standard LED with 12volts - 03/15/08 07:59 AM

do you know what current you need? the equation would be (12V - 3V)/current. So, in general (Source Voltage - LED Voltage)/Current. If you don't know the current, something like 20-25 mA is probably safe.
Posted by: TCPMeta

Re: Single standard LED with 12volts - 03/20/08 05:54 PM

What ever how many cars use. I'm trying to build a custom circuit for my carputer
Posted by: flippy10

Re: Single standard LED with 12volts - 03/24/08 08:37 AM

1K Resistors, I've used them with 12V before and it's fine. They should provide ample current for the LED unless it's extremely high draw. Not only that but a pack of 6, from Radioshack (U.S. Electronics Store) is something around 1.15$

http://ourworld.compuserve.com/homepages/Bill_Bowden/led.htm
You can also use that. If you don't know the stats on your LED, do your best to figure them out. Usually they'll be on the packaging, unless you've sourced from a surplus or another machine, etc.
Posted by: TCPMeta

Re: Single standard LED with 12volts - 03/27/08 06:24 PM

I finally got the full specs of the LEDs I want to use and also found the correct voltage.

12.9v - 7.76v(1.94x4)= 5.14 / 35ma = ~150ohm