question for the electrical experts on an idea

[bishop]

OK...Ill try to simplify this idea to how my brain is seeing it and someone tell me if its possible or if im way off base on how this would function.

My idea is for an in line VV mod for a usb passthrough that you would pulg to the usb the hook your passthrough into the out port of.

I know the output of most isb is standard but if you put a digital display of the out put desiered and had capicators in the unit to store up to the selected output...would it work? or would u still need a battery bank inside it to store and release the higher draws?


If its possible someone put a diagram of what I would need and Ill build a test model.

 

[SeanO'Connell]

I as well am just getting in to the world of VV and PT's. From what i know As long as you VV puts out enough current to fire your atty,carto,CE2 and your usb cable is large enough (awg rating- 24 awg and thicker is the best from what im told) you should be fine.
"My idea is for an in line VV mod for a usb passthrough that you would pulg to the usb the hook your passthrough into the out port of."
^^ could you refrase that please. I couldnt make sense of it. If you mean have a female usb conncetor in your VV so you could power a PT, wouldnt you rather just make a seperate battery pack?. Also its not the output of the usb its the out put of what your pluggin your usb cable into. most pc/laptop usb hubs dont provide enough current to fire an atty, if you can find a wall charger or external usb hub that puts out enough ampage you should be good.

 

[SeanO'Connell]

read this it will explain it better then i can

 

[slimest]

If you want to power your passthrough from computer USB and compensate power loss by capacitors, it will not work. Only accumulator. But why everyone wants to use USB as a power supply? If you have a computer with USB, you also have AC socket. Much easier to use step-down regulator and, say, 12V AC-DC adapter. You get flexible and powerful system without a risk to burn out something.

 

[TomCatt]

Check out BJ43's http://www.e-cigarette-forum.com/forum/battery-mods/220307-vvbox-vvpassthru.html

 

[CraigHB]

Two things I see a lot browsing this forum, people wanting to use computer USB ports to power atomizers or use capacitors to somehow compensate for inadequate power supplies. Neither is a good idea. Capacitors have very low energy density and computer ports can burn up trying to power an atomizer. Then there's the USB cables themselves. They're not designed to carry that much current either. People might think they're vaping at 5V with a setup like that, but between the inadequate power supply and big drop over connectors and wiring, it's actually much lower.

People use USB with some success. For example, you can use a 2A USB wall wart and it will work for the most part, but you're getting considerable voltage drops through the connectors and USB cable. You're probably not vaping at 5V, though performance is still better than a simple battery powered device.

Easiest and best thing to do is use a 2A 5V wall wart (2A min, but higher is better) and wire in directly or use a barrel connector. That type of connector is designed for higher currents and can accomodate the 18 or 20 ga wire that should be used. For a VV direct device, use a 9V wall wart and put a switching regulator in-line.

 

[jrm850]

If you have to use a USB passthrough, I would think a cheap powered USB hub would be a lot better to fry than the $1k laptop.

This one has a 2amp supply- Newegg.com - Rosewill RHB-320W 7 Ports USB 2.0 Hub with Power Adapter

 

[Quigsworth]

I cant help but think that because of the extremely short life cycle of computer tech these days, almost everyone has a "serious" power supply tucked away in their garage/closet/attic/where ever...it's the power supply in your old computer or another good one is the Xbox power supply. Either will supply all the current you could ever want to use, it's a great beginner mod because they're really easy to adapt the wiring and you'll need to build your first vv reg (if it's your first), it's a win/win.

I've tried to see if there was a tutorial on making one of these but I can't find one...I've built a couple (both using an ATX and an Xbox supply), if there is any interest, I'll take the time and do a play by play...

Edit: if you use a computer PSU (power supply unit) 5v is readily available (as well as 3.3v and 12v) so if 5v is what you're gunning for, then you're done. Xbox psu output 12v only so you need a buck reg. A lot of laptop psu's output 16v, so you definitely need a reg.

 

[SeanO'Connell]

@craighb: I recently made a USB pt/pv , think of it kind of like a longer more flexible gooseneck at 7.4 volts. The USB cable is completely stock runs to a 510 conec to a male USB conec. Then I got a box mod with a female USB conec hooked in to two 18650's. 7.4 volts. I plugged the pt into the battery pack and tested the 510 conec with a voltmeter and got 7.3 volts on fresh batteries this was two weeks ago. I just tested it this morning on batteries with a full fresh charge and again got 7.3 volts. I'm not experiencing voltage drops at all.

 

[CraigHB]

Not sure I understand what you're doing. Wiring diagram?

 

[SeanO'Connell]

heres a really crappy but quick diagram

 

[CraigHB]

Oh, okay. So you're driving your atty with 7.4V? Isn't that a little hot? I imagine you get some drop over the wiring and connectors, but still pretty hot. Personally, I'd throw a VV switching regulator in the battery box.

In any case, I thought about doing something similar at one time myself, but never did it. Before I had built any battery mods, I was using a plug-in-the-wall VV power supply on a direct passhtru and thought a battery pack for it would be highly convenient.

 

[Sicarius]

On using capacitors for storage a quick comparison is required.

A typical high quality Lithium battery has 15000 times the watt second capacity as a typical high quality capacitor of the same physical size.

For a 18650 that gives you 8 hrs of intermittent heavy vaping the equavalent energy in capacitor terms is 1.92 seconds.

 

[SeanO'Connell]

I gave it to my father as a Christmas gift. He uses map tanks and rebuilds the coils on his ce2 stems. So he built a couple coils especially for 7.4v the thing rips through vapor but it's so thick and creamy and really makes the flavor pop yah know?

 

[SeanO'Connell]

The nice thing about the battery pack is u don't have to sit next to an outlet. Of course it's not practical for on the go use but it's sure beats be chained to the wall

 

[CraigHB]

Oh, that makes sense. Nothing wrong with building your own atty coils for 7.4V, whatever works well.