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RE: LED rules of thumb


  • To: <ukha_d@xxxxxxx>
  • Subject: RE: LED rules of thumb
  • From: "Dr John Tankard" <john@xxxxxxx>
  • Date: Tue, 17 Sep 2002 14:23:23 +0100
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

> Doing it this way should be safe for the LED and avoid the
> maths side of things. I don't know the formulas off the top
> of my head so cannot help with that at the moment.
>

The maths is like this, use ohms law

V=IR or R=V/I

So a 30ma current with 5v
Is R= 5/0.03 = 166R

Actualy you will find two items If max and If Typ, wich is usualy much
smaller

A typical on I use is 10mA 3v

R= 3/0.01 = 300R

John




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