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Re: LED rules of thumb

To: <ukha_d@xxxxxxx>
Subject: Re: LED rules of thumb
From: "Jon Payne" <jgpayne@xxxxxxx>
Date: Tue, 17 Sep 2002 14:30:53 +0100
Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
References: <005101c25e4d$69279650$0f01a8c0@xxxxxxx>
Reply-to: ukha_d@xxxxxxx

Looks like you do take the LED voltage drop into account (from http://misty.com/people/don/ledd.html) so it's: R = (Vsupply - Vledvoltagedrop) / I e.g. at 12v and 20mA LED with 3.4v drop ("bright white" LED) R = (12 - 3.4) / 0.02 = 430 ohms So, if you don't take the LED voltage drop into account you're LED will be dimmer but safer. Jon.

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References:
- RE: LED rules of thumb
  - From: "Dr John Tankard" <john@xxxxxxx>

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