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. Lets 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.
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. Lets 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.