From: John Woodgate
Subject: Re: Infrared led tester
Date: Thu, 19 Dec 2002 20:50:06 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Thu, 19 Dec 2002 21:39:51 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Spehro Pefhany
wrote (in ) about 'Infrared led tester', on Thu, 19 Dec 2002:
>On Thu, 19 Dec 2002 18:40:55 +0000, the renowned John Woodgate
>>I read in sci.electronics.design that Gregory Calvert
>>wrote (in ) about 'Infrared led
>>tester', on Thu, 19 Dec 2002:
>>>Anybody know of an easy way to test ir leds? Be gentle, I'm a beginner.
>>What do you want to test? If they draw current, and only when connected
>>the right way round to the supply, they almost certainly work.
>Mmm, well, I'd add if they drop about the right voltage (around
>1.2-1.5V) at the right current they are almost certainly working.
>There are a few ways for these things to fail shorted.
Shorted but still diodes? I wrote:
>and only when connected
>>the right way round to the supply,
A small grovel is in order, I think. (;-)
>>If you need to 'see' the IR output, many video cameras are sensitive to
>FWIW, I just tried it quickly with a digital still camera and it
>didn't work very well, if at all.
Many of those now have IR filters because solar IR degrades the visual
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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