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LEDs in a row


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wbrinsonw2 
Member - Posts: 4
Member spacespace
Joined: December 08, 2005
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
ff-mike 
Copper - Posts: 200
Copper spacespace
Joined: November 15, 2004
Location: United States
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.
cowboy21 
Copper - Posts: 64
Copper spacespace
Joined: October 31, 2005
Location: Australia
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
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
wbrinsonw2 
Member - Posts: 4
Member spacespace
Joined: December 08, 2005
Posted: December 15, 2005 at 10:54 AM / IP Logged  

would these resistors work?

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

cowboy21 
Copper - Posts: 64
Copper spacespace
Joined: October 31, 2005
Location: Australia
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
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
wbrinsonw2 
Member - Posts: 4
Member spacespace
Joined: December 08, 2005
Posted: December 16, 2005 at 12:04 PM / IP Logged  
is there any online store you or anyone could recommend?
-Brinson
haemphyst 
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Joined: January 19, 2003
Location: Michigan, Bouvet Island
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...
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."
wbrinsonw2 
Member - Posts: 4
Member spacespace
Joined: December 08, 2005
Posted: December 16, 2005 at 2:14 PM / IP Logged  
thatll work but what ohm resistors would i need?
haemphyst 
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Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
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.
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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