🚀 go-pugleaf

In article <3vhvpus9q0q0konienia8u8fb6400uc8di@4ax.com>, 
JoeBloe@thebarattheendoftheuniverse.org talked about...
> On Fri, 4 Oct 2002 09:14:21 +0100, Keith Wootten
> <keith.w@ntlworld.com> Gave us:
> 
> >In message <3d9d452f.4128065@news.xs4all.nl>, "Wouter van Ooijen 
> >(www.voti.nl)" <wouter@voti.nl> writes
> >>>Have assembled an array of LEDs for use as a 3rd brake light in my car,
> >>>configured as 4 rows of 9 jumbo LEDs, as of yet unwired. Of course the power
> >>>supply will be 12 volts nominal (13.8 volts, maximum).
> >>>
> >>>What is the best method to power these from an intermittent (whenever I press
> >>>the brake pedal) power source?
> >>
> >>The crucial point is that when you put a resistor and N LEDs in
> >>series, the LEDs will take roughly a constant voltage so all voltage
> >>variation from your battery will be over the resistor, thus causing
> >>current variation.
> >
> ><Snip>
> >
> >You can mitigate this to a useful extent by using a small filament bulb 
> >instead of a resistor.  The positive temperature coefficient of the bulb 
> >will help to keep the current variation reasonable as the supply voltage 
> >changes.  The bulb should be selected to run at more or less normal 
> >brightness at maximum supply voltage while passing maximum LED current.
> >
> 
>   Well now.  There's a nice, warm, cozy circuit box for ya.

Well, you've made a comment just as dim as the bulbs would be.  Whether it 
is a lamp or a resistor, or a transistor, the heat output for a given DC 
voltage drop and current will be the same.  Duh.

>   Hahaha....

Laugh's on you.

-- 
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