Alt-BEAM Archive
Message #02757
To: Nicholas Smith nik@resourcekt.co.uk
From: Steven Bolt sbolt@xs4all.nl
Date: Thu, 29 Apr 1999 12:53:43 +0200 (CEST)
Subject: [alt-beam] Re: FLED Photopopper Question
On Wed, 28 Apr 1999, Nicholas Smith wrote:
> >measured the voltage across the FLED go up to 2.45v and the
> >voltage across the photodiode go to 0.7v
> Ahh, sounds like you have your FLED in the wrong way around. Try turning it
> 180degs
The FLEDs I've seen act like a plain diode when you reverse them,
so the voltage across won't rise to more than about 0.6V in that
case. At 2.45V, it's probably connected the right way around, and
it should be flashing visibly. If not, make sure you cover it using
a fairly long bit of heat-shrink; In any sort of light a slowly
rising voltage tends to lock up the current crop of FLEDs.
Best,
Steve
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# sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
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