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 Topic: LEDs in a row ( Topic Closed)
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wbrinsonw2
Joined: December 08, 2005
Posts: 4 |
| Posted: December 08, 2005 at 1:41 AM - IP Logged |
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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
Joined: November 15, 2004
Location:
United States
Posts: 200 |
| Posted: December 12, 2005 at 10:49 AM - IP Logged |
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| 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
Joined: October 31, 2005
Location:
Australia
Posts: 64 |
| Posted: December 15, 2005 at 4:34 AM - IP Logged |
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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
Joined: December 08, 2005
Posts: 4 |
| Posted: December 15, 2005 at 10:54 AM - IP Logged |
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cowboy21
Joined: October 31, 2005
Location:
Australia
Posts: 64 |
| Posted: December 16, 2005 at 1:47 AM - IP Logged |
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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 |
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wbrinsonw2
Joined: December 08, 2005
Posts: 4 |
| Posted: December 16, 2005 at 12:04 PM - IP Logged |
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is there any online store you or anyone could recommend?
-Brinson |
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haemphyst
Joined: January 19, 2003
Location:
Bouvet Island
Posts: 4,983 |
| Posted: December 16, 2005 at 1:15 PM - IP Logged |
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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
Joined: December 08, 2005
Posts: 4 |
| Posted: December 16, 2005 at 2:14 PM - IP Logged |
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| thatll work but what ohm resistors would i need? |
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haemphyst
Joined: January 19, 2003
Location:
Bouvet Island
Posts: 4,983 |
| Posted: December 16, 2005 at 3:08 PM - IP Logged |
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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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