Subject: Re: Best way to power array of LEDs?
Summary: What do you think of these ping times eh?
References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <7tGLdeAS6fn9EwBv@jmwa.demon.co.uk>
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Date: Sun, 06 Oct 2002 04:48:27 GMT
NNTP-Posting-Date: Sun, 06 Oct 2002 00:48:27 EDT
On Fri, 4 Oct 2002 21:48:18 +0100, John Woodgate
>I read in sci.electronics.design that Roger Dewhurst
> wrote (in )
>about 'Best way to power array of LEDs?', on Sat, 5 Oct 2002:
>>What about putting in a voltage doubler or tripler and then
>>doubling or tripling the number of LEDs in series?
>Let's have a competition to see how unbearably complicated we can make
>the task of feeding 36 LEDs from a car battery.
>The winner gets to make his design - and have it hung round his neck
>like the Ancient Mariner's albatross. (;-)
We manufacture a battery operated flight control wand that is a bus
bar pair, and an array of paralleled LEDs. The point one poster was
making is that each individual LED must be matched for voltage drop
with a series resistor in one leg of the LED. The resistor/LED series
pair then gets added to the bus bar(s).
I see two forks of silver plated copper like two hands with the
fingers fanned apart and mingled together with the other hand. Four
fingers each hand, one entering on the left, the other one the right.
One is the +12 volt bus, and one is ground. Each tine would get one
of the four rows of nine's anode lead, the other rail would get the
resistor lead the extends after the series connection with the cathode
of the LED.
One could even get a light meter, and precisely match the brightness
output of the LEDs or even make a pattern of bright and dim LEDs to
form a word like STOP.
Pretty simple solution