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'[EE]: Self Flashing light powered LED cct'
2001\09\26@013848 by Russell McMahon

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   Self flashing LED
   Place it in bright light and the LED flashes.
   Self powered

              ftp://ftp.eskimo.com/u/m/mzenier/kmcmled.gif

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2001\09\26@101836 by Lawrence Lile

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Is the LED generating juice from the light?  This is hard to swallow.  I've
seen LED's used as detectors, but I thought the amount of power they could
generate was negligible.

I wonder if it would blink on the back of my bicycle when headlights shine
on it?  (Just before it is squashed flat


--Lawrence Lile


{Original Message removed}

2001\09\26@111311 by Scott Newell

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>Is the LED generating juice from the light?  This is hard to swallow.  I've

Sure they can.  It's a PN junction exposed to light, after all.

I've got one of those famous three cell AAA NiMH packs connected to a white
led in my room.  It's been connected for a couple of months, and I noticed
the other night that there is still a very faint glow coming from the led.
I suspect the photocurrent is very slightly charging the battery pack.


newell

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2001\09\26@115705 by Kevin Blain

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presumably this LED has to be in a flashing circuit, or it runs the risk of
its own light creating current, and it just gets brighter, and brighter, and
brighter ....... ;-)


Regards, Kevin

{Original Message removed}

2001\09\26@131124 by Lawrence Lile

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Sounds kinda like a perpetual motion machine....  ;-)  Just put a mirror in
front of the LED, which reflects the light back to the LED, generates more
juice than went in, and charges the battery.

I'll patent it just after I patent my cordless bungee jumping tower ;-o


{Original Message removed}

2001\09\26@132346 by Scott Newell

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>Sounds kinda like a perpetual motion machine....  ;-)  Just put a mirror in
>front of the LED, which reflects the light back to the LED, generates more
>juice than went in, and charges the battery.

Well, I guess I'll have to put a meter on it tonight and just see which way
the current is headed.  (Of course, I should have done that before shooting
off my mouth.)


Here's a (long) link to a discussion from sci.electronics.design about the
self powered blinking led circuit:


groups.google.com/groups?hl=en&threadm=5kktlp%247ht%40fridge-nf0.sho
re.net&rnum=1&prev=/groups%3Fq%3Dblinking%2Bled%2Bself%2Bpowered%26hl%3Den%2
6rnum%3D1%26selm%3D5kktlp%25247ht%2540fridge-nf0.shore.net


Note that Winfield Hill commented on the circuit...


newell

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2001\09\26@143809 by alice campbell

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If you try this at home, try sanding the nose of the LED off, not quite as far as the junction.  The plastic absorbs a lot of light, so sanding them down helps.  Try a nail file or bit of sandpaper.  If you sand too far the LED responds by burning up  :o

alice



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2001\09\26@214234 by Arpit

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What does it mean by a 2 inch toroid? two inches internal or external
diameter?

ALso, whats the purpose of the 2 diodes in series, and why are they
called 'switching'. Thanks.

On Wed, 26 Sep 2001 17:26:53 +1200, you wrote:

>    Self flashing LED
>    Place it in bright light and the LED flashes.
>    Self powered
>
>               ftp://ftp.eskimo.com/u/m/mzenier/kmcmled.gif

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