How many milli amps does 1 Atomizer use?

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bigblue30

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Welcome to geek land….lol. Yes, I am a 55 year old geek.

Let's see if I can get this back on track.

First off I have to apologize to walterdsouzajr for hi-jacking his thread.

04_srt and I were talking about how to get that “sweet spot” from different attys. The “spot” is when you have the perfect amount of power (watts) being used by the atty. I think we all agree on this.

Like Scottbee said in a different post: http://www.e-cigarette-forum.com/forum/joye-510/65055-battery-voltages-surprise.html

“I put them on a true 3.7V device, and they "came back to life"”. Let's use the numbers he used in that post.
1. Atty with a resistance of 2.5
2. A voltage of 3.7.
3. That would give us 5.476 watts being used by this setup.

P = E 2 / R

Now we all know that 5.476 might not be the perfect power for all attys, but let's use that for the rest of this post.

Scottbee said that “Neither fixed current or fixed voltage is the appropriate method for attempting to get uniform performance with varying atty/cartomizer resistance.

Delivered current does not have a direct relationship to produced heat. Neither does the voltage. It is the POWER (
Watts) that has the direct relationship."

Using his own words, I have to say “I'm sorry.. but this is just not correct.”

Ohms law says that P = E x I. I think that is about as direct as you can get.

So, where this thread might have been misunderstood is that 04_srt and I were trying to find a way to deliver that sweet spot wattage of 5.476 to any atty.

If we use only a battery with a voltage of 3.7 (see Scottbee's post for more about this), then we are locked into the 2 values (in this case) that make power; 3.7 volts and 2.5 Ohms. This would equal (P = E 2 / R) 5.467 watts or 1.48 amps and all would be great.

We all know that all batteries and all attys are a little different. Let’s look at 3.6 volts and 2 ohms. That would be 6.48 watts at 1.8 amps. There goes that sweet spot.

If we use a 5 volt regulator like a lot of mods are doing, then we have no way to ever hit that sweet spot….. 5 volts with a 2.5 atty is 10 watts at 2 amps (if your battery could even keep up). You would have to have a 5-Ohm atty to hit the spot. I have not found one of mine to be that high. This why I said before that constant voltage is not the way to go.

Just so we are all clear, the way a voltage regulator works is by changing the current it outputs to match the load it is connected to. A constant voltage device works by varying the current it will allow to pass. E = I/R. Since the atty can not change its resistance, the current has to change to keep the voltage at 5 volts.

04_srt and I should have said that what we want is a variable Voltage device so we could keep the current constant or set once we find the sweet spot for our attys.

Scottbee, you are correct… We would need to start with a higher voltage than the normal 3.7 volts. And we will need an adjustment pot so we can very the output to the atty. P = E x I. By changing the voltage, we will be able to “dial” in any sweet spot we want.

That is how my current home setup works. I can make my carto run at anywhere from 0 watts up to 14 watts.

Feel free to correct me if I'm wrong. When I get my portable working, I'll let you know how it works.
 

Scottbee

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Sep 18, 2009
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Blue,

If you want a variable voltage device so that you can dial in your sweet spot for any specific atty or cartomizer.. then look at the "Buzz". It's a variable voltage PV, and I was one of the Alpha/Beta testers.

But I don't believe that 04_srt was talking about a variable voltage or variable current device. His post (based on my interpretation) was.. "deliver this fixed current to any atomizer or cartomizer and you will like it".
 

Quick1

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Feb 11, 2010
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Blue,

If you want a variable voltage device so that you can dial in your sweet spot for any specific atty or cartomizer.. then look at the "Buzz". It's a variable voltage PV, and I was one of the Alpha/Beta testers.

But I don't believe that 04_srt was talking about a variable voltage or variable current device. His post (based on my interpretation) was.. "deliver this fixed current to any atomizer or cartomizer and you will like it".

That is what he said, that's not what he meant, and he didn't get the physics right trying to explain it. :)

He said fixed current.
He was thinking that fixed voltage does not take into account different resistances of different atomizers.
He was mistaken thinking that a fixed current draw factors in both voltage and resistance (actually I don't think he was mistaken, he just mistated and meant to say wattage).

how'd I do?
 
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Sci

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Dec 12, 2009
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The one thing that is not being figured on is the fact that a battery(voltage) is not constant. When the battery weakens, so does the current & power. Now, if there was a variable resistance atty that could automatically adjust as voltage changed, the sweet spot could be held. Of course, you'd need to make sure you use a battery that the protection circuit works properly so as not to over-discharge the battery.
 

bigblue30

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Scottbee,

I told you was old.....When I had to learn ohm's law I had to learn it all.

And on tests I had to figure them out on a slide rule. I could use my SR10 calacator....BUT not on tests....... I am old.


getimage.asp
 

o4_srt

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Jun 2, 2010
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The one thing that is not being figured on is the fact that a battery(voltage) is not constant. When the battery weakens, so does the current & power. Now, if there was a variable resistance atty that could automatically adjust as voltage changed, the sweet spot could be held. Of course, you'd need to make sure you use a battery that the protection circuit works properly so as not to over-discharge the battery.

if you had supply voltage equal to 7.2 volts on a full battery, and you used a regulator to drop it down to 5 volts initially, then you had the power compensation drawing from the regulator, would the regulator still put out 5v, even if the battery supply dropped to 6.5 or lower? as long as the batteries don't drop below 5v, it should be fine, right? or am i misinterpreting what a voltage regulator does?
 

bigblue30

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ECF Veteran
It all depends on the "type" of battery. If you are looking for a battery that will supply current for a long time. Lead acid has a very good discharge curve.....but I do not think you want to carry around a Sears diehard..lol

So we have to use what is around now. I am looking to use the current E-cig batteries or something like them. I do not want to have a 6 cell "cop" flash lite".

I fly RC helli's and I have a few high amp 7.4 volt batteries. These are protected so you will not blow out your pocket if you carry them. They have a good discharge curve.


what would be the best way to figure this out?
 

WillyB

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Oct 21, 2009
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ive found atty performance to be extremely consistent if you regulate current instead of voltage, since current is what heats up the coil. if you apply the same amount of current to each atty, regardless of lr, hv, carto, or standard, you will get almost identical performance.

ive found my ideal current to be around 1.3 amps, or 4v on a stock atty, a litte over 4v on a 306 atty, and 5v on a 510 carto.

people should be more focused on current than voltage, as every atty will perform differently with a constant voltage.

to answer your original question: 1.19A on a stock atty, 1.17A on a 306 atty and 970 mA on a 510 carto
That is pretty pathetic for a Joye 510. Not even worth the trouble.
 
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