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the12volt`s installbay - Mobile Electronics Forums the12volt's install bay / Lights, Neon, LEDs, HIDs

Subject Topic: LEDs in a row (Topic Closed Topic Closed)

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wbrinsonw2
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Posted: December 08, 2005 at 1:41 AM - IP Logged  

I need to wire 23 3.2-3.3v leds in a string form with a 12v souce. How can i achieve this?

Thanks,
Brinson
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ff-mike
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Posted: December 12, 2005 at 10:49 AM - IP Logged  

You will need to split them up, as a sting of LEDs can not have a higher voltage drop than the source.
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cowboy21
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Posted: December 15, 2005 at 4:34 AM - IP Logged  

ok now u can if u like share up to 3 leds to one resistor but it is recommended to have a resistor on each, they don't cost much anyway, to power 3.2v and 3.3v leds you can use a 430ohms resistor for both 3.2 and 3.3, remember to have a fuse close to you power source, good luck
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modest yet effective... ECLIPSE 12", Venom 8"x2, Focal 5 1/2" comp.,Response amps x2 (580WRMS total @ 4Ohms), Pioneer TFT + DVD, good for 148.7dB
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wbrinsonw2
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Posted: December 15, 2005 at 10:54 AM - IP Logged  

would these resistors work?

http:///.com/RC42GF431J...

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cowboy21
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Posted: December 16, 2005 at 1:47 AM - IP Logged  

yeah they would work but why would u spend that much? $10 for 25??? go to ur nearest electronic store, they will be like 4 - 6c each, plus better wattage flow, i wouldn't use those ones
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modest yet effective... ECLIPSE 12", Venom 8"x2, Focal 5 1/2" comp.,Response amps x2 (580WRMS total @ 4Ohms), Pioneer TFT + DVD, good for 148.7dB
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wbrinsonw2
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Posted: December 16, 2005 at 12:04 PM - IP Logged  

is there any online store you or anyone could recommend?

-Brinson
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haemphyst
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Posted: December 16, 2005 at 1:15 PM - IP Logged  

Forget the resistors and all that garbage! More work than it is worth. Add one more LED for a total of 24 LEDs, and wire them in series into 6 strings of 4 in each. Works perfectly, and ALL of them will all be exactly the same brightness. Resistor values change from resostor to resistor, and will cause different current drops across each LED, affecting their brightness...
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wbrinsonw2
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Posted: December 16, 2005 at 2:14 PM - IP Logged  

thatll work but what ohm resistors would i need?
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haemphyst
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Posted: December 16, 2005 at 3:08 PM - IP Logged  

None. 3.2v X 4 = 12.8v The voltage drop across the LEDs is exactly what you need.

Even running voltage, 14.4, will still be safe:
14.4 / 4 = 3.6v drop per LED. Yes, it is a little bit high, but if you look at the specs for MOST LEDs (what color LEDs are you using anway?) 3.2-3.8 v is the usual voltage range.
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
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