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Coaltrain22 08-05-2018 04:19 PM

Installing LED headlights
 
I have a B'mann Consolidation with an Airwire900 board powered with a 14.8v battery. I want to install a 5mm LED headlight but don't know what size resister to install. any help would be appreciated

armorsmith 08-05-2018 05:03 PM

Coaltrain22,

Here is the calculator provided on DigiKey's site https://www.digikey.com/en/resources...eries-resistor

You will be able to purchase both the LED and the resistor there.

LGB333$$$$ 08-06-2018 08:39 PM

LED Source
 
Quote:

Originally Posted by Coaltrain22 (Post 1136994)
I have a B'mann Consolidation with an Airwire900 board powered with a 14.8v battery. I want to install a 5mm LED headlight but don't know what size resister to install. any help would be appreciated

Do a search on Amazon.com...........I bought LEDs from a vendor very reasonably priced with the needed resistor already inserted in one of the for each LED. Reduces the work to insert them yourself in the wires

East Broad Top 08-07-2018 02:11 AM

I've always used 1K ohm resistors with my LEDs. Those tend to work up through all the track voltages common to large scale. If you know you're going to be running on lower voltages (battery power, for example) you can use lower-value resistors, but you don't really save anything by doing so--except time if you can't find your blasted stash of 1K ohm resistors and can only find 680 ohm resistors. (Purely hypothetical situation, mind you.)

Later,

K

Dan Pierce 08-07-2018 07:23 AM

A 1k resistor on a 10ma led is not enough!!


10 ma leds need 100 ohms for each volt dropped.
20 ma leds need 50 ohms for each volt dropped.


So, a 24 volt source with a 2 volt led at 10 ma needs 22 volts times 100 ohms, 2200 ohms!!!!

East Broad Top 08-07-2018 11:55 AM

I push 20ma through mine without trouble, so that's why 1K works for me. I source them from "warm white" strands of Christmas lights. Hit the after-Christmas sales. You can walk out with 1000 LEDs for $10.

Later,

K

Martan 08-07-2018 03:35 PM

I use these little guys all over the place. In my battery locomotives and outside in my buildings. I run 12v to all my buildings and do 14.8 in my locos. They hook directly to the 12/14v and automatically drive the proper current to the LEDs. I can usually power about 3-4 LEDs with one of these.



https://www.mouser.com/ProductDetail/689-CL2N3-G

Dan Pierce 08-08-2018 07:15 AM

Martan. the CL2 does limit current to 20ma and if you use 20 ma leds in series it works great, no resistor values to figure out.

Martan 08-08-2018 08:56 AM

Yeah, I never use resistors anymore. Too much math! ha. I order the CLs in bulk from mouser. Great little devices.


I also do the LED strings like Kevin said, Lowes and Home Depot have the warm white strings all year. The after xmas stuff is also great, you get some nice colored ones for signals and signs and stuff.

Dick413 08-09-2018 08:48 PM

Go to your airwire manual for that decoder it will tell you what resister to use and how to hook it up to that board
dick


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