Re: LED rules of thumb

["Dave McLaughlin" <dave@xxxxxxx>]

Oops my maths was wrong.

The correct resistance should be 480 ohm for 12V supply and not 108 as
I
previously stated... I used 5V as the supply in my calcs..

Dave....

----- Original Message -----
From: <steve.cooper@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, September 17, 2002 2:25 PM
Subject: Re: [ukha_d] LED rules of thumb


>
> >> I don't know the formulas off the top of my head so cannot
help
> with that at the moment.
>
> It just the basic Voltage = Current x Resitance
>
> So 12v supply and 20mA needed.
>
> Resistance = Voltage / Current
>
> Resistance = 12 / 0.020 = 600ohms

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