Re: Best way to power array of LEDs?

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#139

From: Lizard Blizzard
Date: Sat, 09 Nov 2002 00:05

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John Woodgate wrote:
> I read in sci.electronics.design that Lizard Blizzard <NOSPAM@rsccd.org>
> wrote (in <aqeja8$10coe$1@hades.csu.net>) about 'Best way to power array
> of LEDs?', on Thu, 7 Nov 2002:
> 
> 
>>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
> 
> 
> If you mean the ASCII art thing you posted before, 2 transistors and 2

No, you trimmed the URL off!  Here it is again.
http://radiolocation.tripod.com/LEDdimmer/LEDlampDimmer.html

> resistors is marginal for 'simple' in my book. And the voltage drop must
> be something over 1.2 V, not 0.2 V. There are two Vbe voltages stacked
> up. 1.2 is more than 1.09.




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From: Lizard Blizzard <NOSPAM@rsccd.org>
Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair
Subject: Re: Best way to power array of LEDs?
Date: Fri, 08 Nov 2002 16:05:24 -0800
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