It depends on the drop voltage of your new LED's, it differs from color-to-color. Are you using 3mm or 5mm LEDs in the switches?Towncivilian wrote:What kind of resistors will work for the LEDs? I'm getting some LEDs to replace the switch pack LEDs, and went with the 15-ohm 1/2 watt 5% tolerance resistors that were suggested in the guide. Will those work fine for the hazard button and rear defroster button?
I bought 10 of these LEDs for use in the door switch packs and the hazard button/rear defroster, with one left over as an extra in case I mess up an LED. I bought 2x5-pack of 15-ohm 1/2 watt 5% tolerance resistors from Radio Shack as well.Pwnin O'Brien wrote:It depends on the drop voltage of your new LED's, it differs from color-to-color. Are you using 3mm or 5mm LEDs in the switches?Towncivilian wrote:What kind of resistors will work for the LEDs? I'm getting some LEDs to replace the switch pack LEDs, and went with the 15-ohm 1/2 watt 5% tolerance resistors that were suggested in the guide. Will those work fine for the hazard button and rear defroster button?
Those LEDs have a forward voltage of 3.4V and a forward current of 20mA. For a single LED in the switch you need at least a resistance of 530ohms. So you should get a pack of 560ohm resistors (0.5W) with a 5% tolerance. If you were to use the 15ohm resistors you currently have the LEDs would blow out almost instantly.Towncivilian wrote: I bought 10 of these LEDs for use in the door switch packs and the hazard button/rear defroster, with one left over as an extra in case I mess up an LED. I bought 2x5-pack of 15-ohm 1/2 watt 5% tolerance resistors from Radio Shack as well.
Okay, I'll return those resistors I bought and buy the 560ohm instead. Thanks!Pwnin O'Brien wrote:Those LEDs have a forward voltage of 3.4V and a forward current of 20mA. For a single LED in the switch you need at least a resistance of 530ohms. So you should get a pack of 560ohm resistors (0.5W) with a 5% tolerance. If you were to use the 15ohm resistors you currently have the LEDs would blow out almost instantly.Towncivilian wrote: I bought 10 of these LEDs for use in the door switch packs and the hazard button/rear defroster, with one left over as an extra in case I mess up an LED. I bought 2x5-pack of 15-ohm 1/2 watt 5% tolerance resistors from Radio Shack as well.
Don't these have a forward current of 30mA, which would change their requirements to 353.3 ohms at 14v (even fewer ohms at 12v or less)?Pwnin O'Brien wrote:Those LEDs have a forward voltage of 3.4V and a forward current of 20mA. For a single LED in the switch you need at least a resistance of 530ohms. So you should get a pack of 560ohm resistors (0.5W) with a 5% tolerance. If you were to use the 15ohm resistors you currently have the LEDs would blow out almost instantly.Towncivilian wrote: I bought 10 of these LEDs for use in the door switch packs and the hazard button/rear defroster, with one left over as an extra in case I mess up an LED. I bought 2x5-pack of 15-ohm 1/2 watt 5% tolerance resistors from Radio Shack as well.