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Author Topic: finding led for trackball...  (Read 1069 times)

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bossyman15

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finding led for trackball...
« 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?
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hanelyp

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Re: finding led for trackball...
« Reply #1 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.
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bossyman15

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Re: finding led for trackball...
« Reply #2 on: May 12, 2006, 01:48:25 am »
replace lamp with led.
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hanelyp

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Re: finding led for trackball...
« Reply #3 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).
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