From: John Woodgate
Subject: Re: current source for array of infrared leds
Date: Thu, 5 Dec 2002 13:01:43 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Thu, 5 Dec 2002 13:39:50 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Tony Williams
wrote (in <email@example.com.
uk>) about 'current source for array of infrared leds', on Thu, 5 Dec
>In article ,
> John Woodgate wrote:
>> I read in sci.electronics.design that Tony Williams
>> wrote (in <firstname.lastname@example.org.
>> uk>) about 'current source for array of infrared leds', on Wed, 4 Dec
>> >So the final circuit for 1 LED at 20mA is a voltage
>> > source of 1.41V, and a 15 ohm series-R.
>> > For 7 LEDs it would be 8.9V and 105 ohms.
>> > Does that look a reasonable way to do it, do the final
>> > results look reasonable?
>> That's what I had in mind, but then who am I....?
> You missed my typo.................
I didn't check your figures; I meant that the principle you illustrated
was what I also thought about.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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