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Resistor for LED Fan Project - Page 2

post #11 of 54
Exactly. You posted an image of such a design above.
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post #12 of 54
Thread Starter 
I think something is wrong with my calculations.

From Wikipedia:

"
In a series circuit, the current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component.
In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents through each component.[3]
"

The vdrop formula with a series circuit is correct I think.
However, I think I did the math wrong for the parallel circuit.
I'm wondering maybe it should be 0.02 amps instead of 0.16 amps for the calculations.
Edited by Cancer - 3/25/13 at 10:17pm
    
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post #13 of 54
Thread Starter 
ohms = volts / amps
10 / 0.02
500

watts = amps * volts
0.02*10.0
0.2 watt

Wait.....maybe I'm still doing it wrong....it said total current not same current for parallel circuits.
Maybe then....
20/8/1000
0.0025 amps

ohms = volts / amps
10/0.0025
4000

watts = amps * volts
10*0.0025
0.025 watt

.......no that doesn't seem right.
Let's see...in series you add voltages...so maybe then in parallel you do add the currents....which would make it 0.16 amps...which would suck.

8 led parrallel
ohms = volts / amps
10/0.16
62.5

watts = amps * volts
10*0.16
1.6 watt

4 led parrallel
ohms = volts / amps
10/0.08
125

watts = amps * volts
10*0.08
0.8 watt

Yeah......damn.
Argh....guess I should rewire it after all...otherwise I'll have to buy "special" resistors.
Screw that.
Edited by Cancer - 3/25/13 at 10:21pm
    
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post #14 of 54
1/4 watt resistors are dirt cheap. They go up in price pretty fast after that. Definitely go with the 2x4 array.
post #15 of 54
I'm not really following your calculations, because they really get so far from reality its tough to see what you are trying to do.

You can look at the series-parallel as two completely separate circuits. Since each pair of 4 gets its own resistor, they will act completely independently. Each completely separate path from the power source + and - are independent, they only affect how much power is drawn from the power supply. Your power source is too powerful for that to matter.

Its like plugging multiple things into a power strip.

So run your calculations for 4 leds, then build 2 independent circuits from that.

Target current is 20ma, or .02 amp. 4 Leds, each with a voltage drop of 2 volts, mean that they will see a total voltage drop of 8V. This leaves 4 volts for the resistor.

ohms = volts / amps

4 / .02 = 200 Ohms.

Now let's find the power.

Watts = Volts * amps

.02 * 4 = .08W. You can use any of the other power formulas you posted and will get the same answer.

That's it. That's all there is to it. Use 2, 200 ohm resistors for each set of four. You can use the smallest wattage resistor you can find.

Which is exactly what you had before:

Quote:
Originally Posted by Cancer View Post

This looks like two series of arrays in parallel to me:



It says to use 220Ohm because 220 is a standard size and is thus far easier to find. It doesn't affect anything.
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post #16 of 54
Thread Starter 
Those other calculations were just an attempt to not have to rewire the project.

I think I figured it out though.

Series circuit:
amperes are constant
volts are totaled (obtain sum of the components)

Parallel circuit:
amperes are totaled (obtain the sum of the components)
volts are constant

Which when applied to the formulas still makes more sense for me to use series.
.......on the other hand I'm using series/parallel and I'm not sure how that affects things.



Would the volts or current be affected because there are 2 series circuits in parallel?
    
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post #17 of 54
Thread Starter 
    
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post #18 of 54
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post #19 of 54
Thread Starter 
Why are the resistors after the LED's?
Is the circuit just looped back onto itself? I don't see 12v- at the end just a o.
    
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post #20 of 54
It doesn't matter when in the circuit the resistor is. Before, after, in the middle, is all fine.

The circuit isn't looped back on itself - that 0 indicates the ground or negative lead.

As I said, each complete circuit between the voltage + and ground is independent. The four diode and the resistor each form a complete circuit that don't interfere with each other in any meaningful way. As I said, its like plugging more things into a power strip. The only thing that happens is an increased load on the PSU.

You can keep adding 4 diode sets with the same size resistor until the power supply gives out.



You can do the 62 ohm, all-in-parallel thing, but if you do I'd get a 5W resistor, because running 1.6W through a 2W resistor will cause it to get freaking hot. Also, TLHarrel is right - if one dies it'll cascade. This is because the same amount of current (160ma) will be split among fewer LEDs. This is likely to happen, since LEDs are all a little different, and more current will flow through the one LED with the lowest voltage drop. Each will light a little different than the others, and the brightest will likely fail, causing the others to get brighter, causing another to fail, and so on.
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Tractorbox II
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