Installing LED headlights - myLargescale.com > Community > Forums

Reply
 
LinkBack Thread Tools
Old 08-05-2018, 04:19 PM   #1 (permalink)
Junior Member
 
Join Date: Aug 2018
Posts: 3
Default 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
Coaltrain22 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-05-2018, 05:03 PM   #2 (permalink)
Senior Member
 
armorsmith's Avatar
 
Join Date: May 2008
Posts: 645
Default

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.
armorsmith is offline   Reply With Quote Quick reply to this message
Old 08-06-2018, 08:39 PM   #3 (permalink)
Senior Member
 
LGB333$$$$'s Avatar
 
Join Date: Oct 2017
Location: McLean VA
Posts: 186
Default LED Source

Quote:
Originally Posted by Coaltrain22 View Post
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
__________________
Tom White
Large G Scale Railfan
www.olddominionrailways.com
LGB333$$$$ is offline   Reply With Quote Quick reply to this message
 
Old 08-07-2018, 02:11 AM   #4 (permalink)
Super Moderator
 
East Broad Top's Avatar
 
Join Date: Dec 2007
Location: Centennial, CO
Posts: 4,959
Default

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
East Broad Top is offline   Reply With Quote Quick reply to this message
Old 08-07-2018, 07:23 AM   #5 (permalink)
Senior Member
 
Join Date: Jan 2008
Location: South Eastern MA, USA
Posts: 3,865
Send a message via Yahoo to Dan Pierce
Default

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!!!!
Dan Pierce is offline   Reply With Quote Quick reply to this message
Old 08-07-2018, 11:55 AM   #6 (permalink)
Super Moderator
 
East Broad Top's Avatar
 
Join Date: Dec 2007
Location: Centennial, CO
Posts: 4,959
Default

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
East Broad Top is offline   Reply With Quote Quick reply to this message
Old 08-07-2018, 03:35 PM   #7 (permalink)
Senior Member
 
Martan's Avatar
 
Join Date: Feb 2012
Location: Virginia
Posts: 131
Default

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
Martan is offline   Reply With Quote Quick reply to this message
Old 08-08-2018, 07:15 AM   #8 (permalink)
Senior Member
 
Join Date: Jan 2008
Location: South Eastern MA, USA
Posts: 3,865
Send a message via Yahoo to Dan Pierce
Default

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.
Dan Pierce is offline   Reply With Quote Quick reply to this message
Old 08-08-2018, 08:56 AM   #9 (permalink)
Senior Member
 
Martan's Avatar
 
Join Date: Feb 2012
Location: Virginia
Posts: 131
Default

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.

Last edited by Martan; 08-10-2018 at 09:21 PM.
Martan is offline   Reply With Quote Quick reply to this message
Old 08-09-2018, 08:48 PM   #10 (permalink)
Senior Member
 
Join Date: Jan 2008
Posts: 914
Default

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
Dick413 is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the myLargescale.com > Community > Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in


Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
What wire for LED headlights noela Beginner's Forum 5 08-15-2012 08:20 AM
LED Headlights & Fitting John R RC/Battery Operations 7 04-25-2012 05:11 PM
Did Oil Lamp Headlights Flicker? DKRickman Railroad Operations 6 01-07-2009 03:30 PM
Want to add headlights to my F-40 vsmith Model Making 7 10-23-2008 11:44 AM
Looking for headlights ohioriverrailway Model Making 8 10-21-2008 10:44 AM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -4. The time now is 07:47 PM.



Powered by vBulletin® Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.