From: "Jerry G."
Subject: Re: Best way to power array of LEDs?
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Fri, 4 Oct 2002 02:18:13 -0400
NNTP-Posting-Date: Fri, 04 Oct 2002 02:22:41 EDT
Each LED must have its own series resistor. Most of these LED's work
at about 30 to 40 ma with about 1.6 VDC across them. You should be able
to use a 320 ohm 1/2 watt resistor in series with each LED if these are
in the spec range that I used as an example.
LED's cannot be wired in parallel to each other being fed from one
resistor. They can not also be wired in series with each other.
Jerry Greenberg GLG Technologies GLG
"DaveC" wrote in message
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
supply will be 12 volts nominal (13.8 volts, maximum).
My options, as I see them, are:
1) Wire individual resistors to each LED based on its operating current
2) Wire each row in parallel and connect one resistor based on operating
current for 9 LEDs
3) Install voltage regulator to output voltage (ie, 1.3 volts?) to
all LEDs in parallel.
What is the best method to power these from an intermittent (whenever I
the brake pedal) power source?
Other options for powering this array?
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