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LEDs and Capacitor how to?

post #1 of 14
Thread Starter 
Hey guys im trying to work on a small project that involveds acrylic and LEDs. question i have would be, im planning to use atleast 12 LED bulbs and run it off with my 12v or 5v. how do i figure out what capacitors i need and how many capacitors do i have to use to make the led light up? This is the led im going to use (havent ordered it yet) http://shop1.outpost.com/product/430...H:MAIN_RSLT_PG

And any1 else knows where i can buy em cheap? What i really want is Bright RED led with a clear cap.
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post #2 of 14
It's a resistor you need, not a capacitor.

Capacitor's store electricity and resistor's reduce the current.

Just use Ohms law to find the size of resistor you need (V = I x R)


To find the size of resistor you need it's (R = V)
.................................................. ..........I

R = Resistance (Ohms)
V = Voltage (Volts)
I = Current (Amps)
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post #3 of 14
This is one site I go to for calculating LED resistors

You can also have it calculate a resistor for multiple leds in series

http://led.linear1.org/led.wiz

Those red LEDs will probably take 2.2 volts at 20ma. Put 2.2 in as diode forward voltage and 20 as diode forward current. 12 volts will go into supply voltage and you have 12 leds in your array.

In your case, you would wire 4 leds in series with a 180 ohm resistor and have three strings of that.
    
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post #4 of 14
you can also wire 4 of them in series and run directly to 12v no resistor needed.
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post #5 of 14
There were a couple places to get good deals on Leds I will look around, Radio Shack has some but a limited supply.
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post #6 of 14
Just found this place , It looks pretty good:http://www.superbrightleds.com/
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post #7 of 14
Thread Starter 
wow this led thing isnt easy as i thought it would be wish i would've paid more attention to my shop teacher when i was back in damn high school..ok so heres my diagram theres 5 leds in a row and 5 rows. and this is the led im gonna use http://www.superbrightleds.com/specs/r3mm2_specs.htm

0 0 0 0 0<----led
0 0 0 0 0<----led
0 0 0 0 0<----led
0 0 0 0 0<----led
0 0 0 0 0<----led
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post #8 of 14
Thread Starter 
Quote:
Originally Posted by fstfrddy
Just found this place , It looks pretty good:http://www.superbrightleds.com/
Hehehe i was actually looking at that site before u had given it to me, by the way fast freddy hows those water blocks that u made? any more recent pics?
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post #9 of 14
The blocks work great, right now they run at 28-30 idling and 34-35 at full load, thats a 20 degree drop from air at full load. They are for sale.
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post #10 of 14
just to let u know...i have 4 leds in a row..for a pci bracket mod...and u have to have a resistor to do it...me and my electronics teacher were trying to figure it out....becuase if u dont have a resitor..well them LEDs are going to pop....plus watch how u plug it into the molex..i pluged mine into my case fans one...
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