Re: Best way to power array of LEDs?

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#136

From: ehsjr
Date: Fri, 08 Nov 2002 04:06

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Lizard Blizzard wrote:
> 
> John Woodgate wrote:
> 
> > [snip] Furthermore, 1.09 V is not really enough voltage to
> > operate a simple electronic constant-current circuit.
> 
> Not true.  Here's one that's not that complicated and runs a 3.5V white
> or blue LED off 4 AA Ni-Cds of from 3.8 to 5.6V depending on their state
> of charge.  As he says, it requires only 0.2V more than the LEDs.  I
> modified the circuit to use a single LED, and changed the power FET to a
> 2N4401, plus some other circuit resistance changes.  I get substantially
> the same results.  Regulation is within about 6 percent; not great but
> good enough.
> 
> http://radiolocation.tripod.com/LEDdimmer/LEDlampDimmer.html
> 

Nice!!

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