How much current does the Atty draw

[rfw2003]

Hello this is my first post but I've been reading for awhile now.

I'm starting to get into the modding and I've been wondering, has anyone actully taken a reading on how much current the Atty's actully draw??? reason I ask is because I've see people here say you need at least a 1000mah power source for a pass through, I however find this highly unlikely because all the pass throughs that are batteryless that plug into the USB port on your computer such as the ones sold by pure smoker rely on what a USB port can supply and that is a max of 500mah of current at 5 volts. So I ask again what is the actual current draw that the atomizers use. Myself I am using a 510 from innovapor but I don't have a way of measuring the current draw since I don't have my pass through yet. I have a few mods planned but they depend on what the current draw is for my choice of IC's and such before I can procede.

Thanks in advance

R.F.

 

[Burnie]

Generally from what I have read in the forum an atomizer draws 1 to 1.5 amps, depending on the resistance of the coil (1000 to 1500 ma I think). But this is from what I have read and I have no way to measure it. I always use 3amp buttons as not to have a problem with switches frying. I do have 1 mod with a 1amp switch and it is working fine, but that was my first. Hope this helps.

Burnie

 

[Shreck]

Does the atty coil actually draw current?? I thought it would only take what you feed it.. Its my understanding that its not like an electrical motor that tries to pull the juice. It just uses what you give it.. Am I right in this thinking??

 

[framitz]

An atty at 3.7 volts will want about 1 amp, the same atty at 5 volts will want about 1.5 amps. This is assuming the atty is 3.5 ohms.
If you use a power source that is not capable of providing the needed current then you will not get full power -- which in some cases is OK, but I like to have a power source capable of more current than needed.
(Calculating electric power : OHM's LAW)

 

[rfw2003]

Thanks for the info all.

An atty at 3.7 volts will want about 1 amp, the same atty at 5 volts will want about 1.5 amps. This is assuming the atty is 3.5 ohms.
If you use a power source that is not capable of providing the needed current then you will not get full power -- which in some cases is OK, but I like to have a power source capable of more current than needed.

I didn't even think about measuring the resistance of my atty to figure it out.


O.k. so this leads me to believe that USB pass throughs on a computer are less then ideal so I'll be making a custom port on my computer just for use with the pass through that will have the required current capability.

This now tells me what I needed to know for the mods I will be making and that is a custom formed pcc that has pass through capabilities all in about the size of a pack of 100 size cigs. I plan on making it with casting resin and then covering in leather. it will have a port for the pass through as well as onboard charging for 1 battery and the battery that powers itself

R.F.

 

[warp1900]

Thanks for the info all.




I didn't even think about measuring the resistance of my atty to figure it out.


O.k. so this leads me to believe that USB pass throughs on a computer are less then ideal so I'll be making a custom port on my computer just for use with the pass through that will have the required current capability.

This now tells me what I needed to know for the mods I will be making and that is a custom formed pcc that has pass through capabilities all in about the size of a pack of 100 size cigs. I plan on making it with casting resin and then covering in leather. it will have a port for the pass through as well as onboard charging for 1 battery and the battery that powers itself

R.F.

You don't need a "special" port for your pass-through, all you need is this and you will get very good performance from it., but remember it has to be 1000mA, most are 500 or less. The ones used for iPhones not ipods have the 1000 mA

DealExtreme: $2.99 Ultra-Mini 1000mA USB Power Adapter/Charger (100~240V AC)

 

[rfw2003]

You don't need a "special" port for your pass-through, all you need is this and you will get very good performance from it., but remember it has to be 1000mA, most are 500 or less. The ones used for iPhones not ipods have the 1000 mA

To late I just rewired one of the front usb ports on my computer case to the 5volts from the power supply. Easy mod todo just a little soldering and heat shrink is all that was needed. I also put paint on that port to remind me that it's not for normal use so I don't plug something into it and expect it to work since all that port does is supply 5 volt power.

R.F.

 

[mnealtx]

Does the atty coil actually draw current?? I thought it would only take what you feed it.. Its my understanding that its not like an electrical motor that tries to pull the juice. It just uses what you give it.. Am I right in this thinking??

Nossir.... Ohm's law. Amperage equals voltage divided by resistance....that never changes.

You can plug the atomizer into a supply that provides 500 amps, but that doesn't mean that the atomizer will take 500A from the power supply. However, some power supplies ARE current-limited - see the discussion above about ipod chargers vs. iphone chargers.

If you have a 2 ohm atomizer, then at 4 volts (fully charged lithium ion battery) it draws 2 amps. Plug that same atomizer into a 5v wall-wart via a passthrough, and it draws 2.5 amps....IF the wall-wart can supply that.

 

[Shreck]

Ooops, Wrong thread

 

[BobW]

Here is a 2000ma from the same place Warp posted
DealExtreme: $6.67 2A USB 5V AC Charger (2000mA US Plug)

Also this is the usb hub I use with my 510 direct to 5v. Can handle up to 2.5 amps so says the power supply. I don't have it connected to my pc. Just powered from wall plug.

Newegg.com - CyberPower CP-H420P 4-Port USB2.0 Hub - Hubs

 

[rfw2003]

Here is a 2000ma from the same place Warp posted

Also this is the usb hub I use with my 510 direct to 5v. Can handle up to 2.5 amps so says the power supply. I don't have it connected to my pc. Just powered from wall plug.

well as I said I've already done the mod to one of my usb ports on the computer for the power. As far as your usb hub yes the power cube that plugs into the wall would have to be a little bigger then 2 amps to be able to supply 500mah to each port and also still be able to supply the power to the electronics that run the hub itself and have a little extra to make sure it runs at an exceptable temp.

R.F.

 

[markarich159]

Nossir.... Ohm's law. Amperage equals voltage divided by resistance....that never changes.

You can plug the atomizer into a supply that provides 500 amps, but that doesn't mean that the atomizer will take 500A from the power supply. However, some power supplies ARE current-limited - see the discussion above about ipod chargers vs. iphone chargers.

If you have a 2 ohm atomizer, then at 4 volts (fully charged lithium ion battery) it draws 2 amps. Plug that same atomizer into a 5v wall-wart via a passthrough, and it draws 2.5 amps....IF the wall-wart can supply that.

Would I be correct in assuming that is why the generic Joye510 PT's have an accesory battery(360maH 3.7V) compartment attached. To provide the necessary extra current needed to get optimal power from the atty. I've also heard a normal USB 2.0 port will only supply 150maH unless the software specifically instructs the motherboard to alot more power to that port. And even then the most power alotted (in the USB 2.0 format) is 500maH. Is this correct? You would think the factory PT manufacturers would include a small software packet that instructs the computer to supply the most current availble. Thanks for your help.

 

[warp1900]

Would I be correct in assuming that is why the generic Joye510 PT's have an accesory battery(360maH 3.7V) compartment attached. To provide the necessary extra current needed to get optimal power from the atty. I've also heard a normal USB 2.0 port will only supply 150maH unless the software specifically instructs the motherboard to alot more power to that port. And even then the most power alotted (in the USB 2.0 format) is 500maH. Is this correct? You would think the factory PT manufacturers would include a small software packet that instructs the computer to supply the most current availble. Thanks for your help.

The real purpose of the 10440 battery on a pass-through is to deliver the exact same as a factory battery but form the USB port, lets say it "regulates" the port to deliver 3.7v instead of 5v.
The other cheaper pass-throughs and some others with no battery will give you 5v but only at 500mA which means in the end will perform similar to the 3.7v.
Yes the mA and mAh is pretty confusing but the easiest way to understand it,(at least for me), is by simplifying the explanation.
mA is the max amount of current that the atomizer can draw from the power source and mAh applies to only batteries and tells you how long the battery charge will last before you need to re-charge.

 

[rfw2003]

yes markarich159 you are correct in saying that USB will only supply 100ma of current unless there is a usb chip onboard the device telling the USB host controller on your computer that it needs to use more units of power which is upto 5 units or 500ma of current. That would not be a hard thing to include in a design but essentually useless since the atty's require much more then that to function properly.

R.F.