How come i can't get 5volts out of my laptop for pt

[danwelsh]

ok guys, so heres my problem, i made a passthru and i can't get it to vape well with the laptop, well any laptop, because i have a full size and a mini and i'm only getting maybe 2 volts, rank vape, i thought first that maybe my solder connections were bad but i tried just connecting the positive through the switch to a 3volt battery and ground to negative and my connections are fine? i'm not sure why i can't get the 5volts, anyone know why this is happening? i also tried two different usb cables thinking that may be the trouble.....just wanna get it working it's drivin me nuts.

 

[Java_Az]

Sounds about right if the laptop USB ports were made to USB2.0 specs. The port should max out @ 500 mA if the specs were followed. Not a lot of motherboard and laptop makers follow the specs. So results will differ with different hardware. Pretty sure you have around 5 volts there without a load but once loaded it drops to 2 volts. I would advise you to get a 5 volt 2 amp USB hub to vape off of. Putting the strain of vaping on built in USB ports is not a good idea for computer based hardware in my opinion ( meaning desktops , laptops, tablets , netbooks). Put it this way if you fry a 10 dollar USB hub not to big a deal, If you fry a 700 dollar laptop you might just make yourself cry.

 

[perlionsmitnick]

better yet get a 19 v laptop power supply and regulate it down to 5 volts.

 

[danwelsh]

thanks guys, i actually have an extra laptop power supply and a 5volt regulator, i may just give that a try, and also the hub thing too, thanks again!

 

[perlionsmitnick]

thanks guys, i actually have an extra laptop power supply and a 5volt regulator, i may just give that a try, and also the hub thing too, thanks again!

Let us know how it works out. I want to build one too.

 

[Rader2146]

Let us know how it works out. I want to build one too.

It can't get any more simple than a LM2596 for passthroughs. You already have the power supply and thats the most expensive part. Check out the "just for LM2596 users" thread if you haven't already.

 

[asdaq]

If word got out that a laptop maker were using non-compliant USB specs, it would not be in their best interest. For charging purposes the amperage should not exceed the capacity of device being charged, so they would have complaints of ruining smaller devices. Also they save on precious battery life having USB purposely low. The power supply is a much better way to go.

 

[sgtdisturbed47]

Using a data USB cord, you're maxed out at 500 mA, but if it's a charging cable (data lines are shorted), then the computer's USB port will provide 1.5 amps max. Found this out while using my first passthrough. Using a 2 amp USB charging hub that plugs into AC will give you a better experience.

 

[dragonriot]

Some manufacturers, like Toshiba, put a purpose built USB-Power port on their laptops that produce a full 5v whether the computer is on or off. Usually my phone is plugged into that port, but I do notice a difference from the other USB ports on the computer when using a passthrough. If your laptop has one, it will be USB 3.0, and colored blue, likely with a lightning bolt next to the USB symbol.

 

[Cyclin]

I may have an idea.

I ran into an issue with my supervisors iPad 3 and chargng. The iPad 3 requires more than the 500mA a standard USB 2.0 port supplies. You may be able to up the output of your USB with the ASUS Ai Charger, I don't have much first-hand knowledge of this software as I have attempted to implement it yet. Its just something I stumbled upon earlier today.

 

[danwelsh]

better yet get a 19 v laptop power supply and regulate it down to 5 volts.

Tried the power supply thing and the regulator heats up wayyyy too much, not gonna go with that way

 

[TomCatt]

Check out BJ43's http://www.e-cigarette-forum.com/forum/battery-mods/220307-vvbox-vvpassthru.html. I made my ACDC mod based on BJ's thread. I use a 12V 2A AC adapter in passthrough mode, also have a car lighter adapter to use the PT in the car; no need to be tied specifically to a computer - any place that has an electrical outlet will do.

 

[perlionsmitnick]

Tried the power supply thing and the regulator heats up wayyyy too much, not gonna go with that way

Which regulator did you use?

 

[danwelsh]

Which regulator did you use?

i used a 5volt regulator i got at the source, planning on using it for the detonator mod tuitorial on youtube, but didn't end up making it