Build Your Own Arcade Controls Forum

Main => Main Forum => Topic started by: bossyman15 on May 11, 2006, 08:06:19 pm

Title: finding led for trackball...
Post by: bossyman15 on May 11, 2006, 08:06:19 pm

i want to connect trackball light to ledwiz but my lamp is 14v so i need 5v or less. know of any led?

Title: Re: finding led for trackball...
Post by: hanelyp on May 11, 2006, 09:55:48 pm

You want to run a 14V lamp controled by a device designed to feed 5V to a LED?  Or replace the lamp with a LED?  For the former, there are relays that operate on 5V to switch higher voltages.

Title: Re: finding led for trackball...
Post by: bossyman15 on May 12, 2006, 01:48:25 am

replace lamp with led.

Title: Re: finding led for trackball...
Post by: hanelyp on May 14, 2006, 07:24:49 pm

From an electrical standpoint, just put the right resistor in series with the LED for the voltage.  14V supply, 20mA current through the LED, E=IR : R=E/I -> 700ohms should work (shortcuts taken).