A 4.2V pass thru?

[VpnDrgn]

While I wait for parts to try my first variable voltage mod, I had a thought about a pass thru.

My understanding is that a straight pass thru ( no batty ) on a wall wart will give you 5V ( a little too hot for most of us that use cartos ) and on USB from computer you only get about 4.2V. ( but you run the risk of damaging computer )

Maybe one of the modder gurus can draw up a schematic for a 4.2V ( under load ) pass thru using a 5V/2amp wall wart and a regulator ( with maybe a capacitor and a resistor to make it more stable ?? ).
Or, if that is too much like "reinventing the wheel", maybe a variation on the VV box mod with a USB cable instead of batties? Would Mamu's version of the VV box mod work if you just wired in a USB cable instead of batties? I tried searching for a regulated pass thru on the threads, but after over an hour of reading I couldn't find any threads that weren't about regular pass thrus.

Anybody??!

 

[NicksVap3]

i was thinking a VV pass thru too... id think it would be easy, but im no electronic genius either

 

[Worldgod]

Not really sure why people are worried about frying a usb port...is it even possible unless ya had the wires switched and even then...idk. I made a usb pt and it works jus like it should on about half dozen computers with no problems. Not sure of the actual volts but it does vape nicely

And Vpn where do ya get the 4.2 jus out of curiosity?

 

[VpnDrgn]

And Vpn where do ya get the 4.2 jus out of curiosity?

The 4.2 coming from comp or the 4.2 target for new PT?

- 4.2 would be my target because it would give just a little extra oomph without burning cartos like 5.0V would. I've tried 5V and it is too hot for me on a carto, I am building a VV box in the near future but I doubt it will ever go over 4.5V unless I decide to give a HV atty a try

- I have read in many threads where people that are supposedly in the know have stated that most PT's on a comp are only putting out 4.2V. I have also seen several comments where people have had the USB act up or even burnout the board on their comps. I don't want a PT bad enough to take the chance, especially when I have other options.

 

[Traver]

- I have read in many threads where people that are supposedly in the know have stated that most PT's on a comp are only putting out 4.2V. I have also seen several comments where people have had the USB act up or even burnout the board on their comps. I don't want a PT bad enough to take the chance, especially when I have other options.

You can get a usb wall plug or a self powered computer hub. I'm not sure if a self powered hub would eliminate frying a mother board but it would reduce the chance and you don't have to plug it into the computer.

 

[VpnDrgn]

I know you can use a wall adapter but that puts out the full 5V's and that is too hot for me.
That's why I was looking for a regulated PT to use with a wall adapter.

 

[hankbizzo5]

how about a ac with a output you are looking for? Such as 4.7v 2a

 

[VpnDrgn]

I don't know. Are there AC/USB adapters with different voltages? All I have ever seen where 5V with varying amperes.

 

[WillyB]

I know you can use a wall adapter but that puts out the full 5V's and that is too hot for me.
That's why I was looking for a regulated PT to use with a wall adapter.

You sure?

Time for you to learn a little about Ohm's Law. The vaping voltage is a function of the current available and the ohms of the atty.

A 5V@500mA USB adapter will run a standard 3.2Ω carto at about ~1.6V.

Online Conversion - Ohm's Law Calculator

 

[Gx3vi]

You sure?

Time for you to learn a little about Ohm's Law. The vaping voltage is a function of the current available and the ohms of the atty.

A 5V@500mA USB adapter will run a standard 3.2Ω carto at about ~1.6V.

Online Conversion - Ohm's Law Calculator

This. I ran into a problem trying to make a passthrough today with a wallwart. It would fire but just barely, very little vapor. It was 5V@800mA. Luckily some parts I had ordered came in this afternoon though and I was able to put together a VV passthrough that plugs directly into the wall. It's still in the proof of concept phase, so its just a bunch of wires and parts on the counter at the moment, but it does work. The plan is to add a switch to allow it to use batteries as well when I'm not near an outlet. Still need to find something to house it in. The power supply is rather large o_0 but it was free so I'm going with it. I tested it at 5V and it vaped great.

 

[VpnDrgn]

Are you sure?!

You're comparing kumquats to grapes WillyB. Most adapters are 500ma, and that won't push a PT. That's why I stated a 5V/ 2AMP adapter in the first post,
many people have stated that is what what to use for a PT.

@Gx3vi, Try adapters with 2amp ratings.
2 amp AC to USB Adapter, ideal for Passthroughs
2 amp Car to USB Adapter

Vape On People

You sure?

Time for you to learn a little about Ohm's Law. The vaping voltage is a function of the current available and the ohms of the atty.

A 5V@500mA USB adapter will run a standard 3.2Ω carto at about ~1.6V.

Online Conversion - Ohm's Law Calculator

 

[Gx3vi]

Are you sure?!

You're comparing kumquats to grapes WillyB. Most adapters are 500ma, and that won't push a PT. That's why I stated a 5V/ 2AMP adapter in the first post,
many people have stated that is what what to use for a PT.

@Gx3vi, Try adapters with 2amp ratings.
2 amp AC to USB Adapter, ideal for Passthroughs
2 amp Car to USB Adapter

Vape On People

I just had a few cell phone charger wallwarts laying around. so i figured I'd give it a try, didn't work but I learned stuff. And my goal was to avoid needing the usb part. But I got the VV pt working now, so no need for 2A wallwarts or usb adapters. Got it in a cigar box now so it's more mobile. Definitely not portable, but it's good for watching tv and whatnot.

 

[VpnDrgn]

You know what they say.....PICTURES.....or it didn't happen

and a diagram would be nice if you don't mind sharing

Does anybody have any idea if Mamu's VV box mod would work if you just wired in a USB cable instead of batts??!

edit - Never mind that last question You only get 5V from the adapter, with a minimum 1.5V dropout, you would only get 3.5V..duh

 

[Java_Az]

Here is a 2 amp USB hub under load with a 2.2 ohm tank o miser. Pretty good voltage drop i was getting.

 

[VpnDrgn]

Thanks a lot Java. Is that much voltage drop normal?

 

[WillyB]

Here is a 2 amp USB hub under load with a 2.2 ohm tank o miser. Pretty good voltage drop i was getting.

Those are identical to what I get with this.

~4.17 with a Joye 510. Originally I had a 5' mouse USB cable on it and I was doing about ~3.95V. Cutting it down to ~29" 'fixed' it.

The moral of that story is that a cheap 3-6' or so USB extension cable could be used to tone down a too hot PT.

An interesting anomaly though. I was running a Joye 1.5Ω atty on it and getting ~3.71V, which doesn't make sense. When I get another I'll have to double check. BTW the adapter did get hot.

 

[Java_Az]

Thanks a lot Java. Is that much voltage drop normal?

Yeah pretty much normal. Although like alot of things from china these days. That Powered 2 amp USB hub is over rated. I only get 1.6 amps out of it. I had forgot i had done a amp test on it, but it wouldn't surprise me a bit if most of the 2 amp adapters are over rated these days. Aside from that it comes down to ohms as far as what kind of amps your going to need at a certain voltage. A 2.5 ohm atomizer on the same set up gives me a loaded voltage of around 4.6 volts. The ohms ( resistive load) of the circuit at a certain voltage dictate the amount of amps it needs. example 2.2 ohms @ 5 volts will need 2.27 amps. If there is lower then 2.27 amps for the circuit to draw you will see a voltage drop. So it all boils down to the Law of Mr. Ohm.

 

[VpnDrgn]

Hmm... that probably eliminates vaping from the couch.

The adapter getting warm was the thought behind my first suggestion of a voltage regulator with a capacitor.
The capacitor would buffer the sudden draw from the PT while allowing a smoother flow from the adapter ...Yes?

Definitely curious to see what Gx3vi has come up with.

 

[VpnDrgn]

Yeah pretty much normal. Although like alot of things from china these days. That Powered 2 amp USB hub is over rated. I only get 1.6 amps out of it. I had forgot i had done a amp test on it, but it wouldn't surprise me a bit if most of the 2 amp adapters are over rated these days. Aside from that it comes down to ohms as far as what kind of amps your going to need at a certain voltage. A 2.5 ohm atomizer on the same set up gives me a loaded voltage of around 4.6 volts. The ohms ( resistive load) of the circuit at a certain voltage dictate the amount of amps it needs. example 2.2 ohms @ 5 volts will need 2.27 amps. If there is lower then 2.27 amps for the circuit to draw you will see a voltage drop. So it all boils down to the Law of Mr. Ohm.

I use 2.8 & 3.2 ohm cartos, does that put it back up around 5V's?
By the way, I really appreciate the input guys.

 

[Lightgeoduck]

To get 4.2v I would say make an in line (with battery) mod that had a charging curcuit.. (I am sure that someone that is heavily into modding can come up with a draw up) and this should give you your 4.2v since that is usually the voltage of a fully charged batt. I am not sure on how constant that would be, but I guess it would be on how hard you vape compared to the speed of the charge.. I remember my Janty Stick measured 4.2v (with out load) when I had it constantly plugged into an USB. This method (I would imagine) would be ok utilizing a computer USB port.. since I do that with my devices that CHARGE via usb... I am like most others and wouldn't use a direct PT on a computer..


LGD