3.7v vs 5v

[Nuck]

Have you attained variable voltage with constant current? If so, at what current are you running your mod.

I completely agree that advanced vapers would love a variable voltage/constant current device for all the reasons discussed in this thread.

Yes. The test mod runs at 8.2v with fresh bats (2x14500 in series). This one uses an 801 atomizer so I set it between 5.0 and 5.5 for my usual vaping. I used an LM317 for the regulation in this one, unaware of the drop off issues so I don't have the full voltage range that I wanted on this one.

I now have smaller higher quality pots and some UC283-ADJ LDO chips so I should be able to get a complete range of voltages with less drop off than you get from a 1N4001 diode.

Edit: I just read your question closer and I'm not quite sure I understood it. The current fluctuates (sags) under load like all batteries do at source. The current is obviously shaped during regulation since the resistance of the atomizer is a constant.

 

[breakfastchef]

Thanks for the explanation, Nuck. I wanted to know if the device you are working on will supply constant current, say 1 amp, across all voltages. I understand that current flow decreases under load conditions, but, if the current under load dropped too far, maybe to 400mA, the atomizer might not perform well at that particular voltage.

 

[Nuck]

Thanks for the explanation, Nuck. I wanted to know if the device you are working on will supply constant current, say 1 amp, across all voltages. I understand that current flow decreases under load conditions, but, if the current under load dropped too far, maybe to 400mA, the atomizer might not perform well at that particular voltage.

Nah..it could never get that low. There is a lower limit on the regulator and the batteries would cut out before getting anywhere close to that. Assuming 3.5 ohm resistance which is pretty typical, you would be talking 1.4V with a current of 400ma which is way under the cutoff.

The regulator itself is controlled by the ratio between 2 resistors. They are set for this app to allow voltage to run between roughly 4v and 6v. The current is shaped to match the voltage since resistance of the load is a constant.

 

[scintar]

I know i had debated with the Puresmoker Prodigy i preordered, this very topic. It was originally through battery configuration either a 3.7v or 6.0v vaporizer. As it got closer to production, the specs were changed to a regulated 5volt output. You can pick either config and i have been debating it ever since.The owner/designer stated that 3.7 was "underpowered, and 6volts was a juice hog as well as concerns for "atomizer homicide". He stated 5 volts was the sweetspot for the combined factor of juice usage,atomizer life,flavor and vapor. I will hopefully be doing a mod soon, and these opinions will help with that decision too.

i would agree with this. If running say 2 cr123a's Get the voltage down arrounf 5v. That will produce enough vapor and help protect atty life.
PS, Love the avatar. He will be missed!

 

[RazorNribbonz]

Nuke, even though I don't understand the more technical side of what you're talking about..It makes a lot of sense to me...It would explain why I've been frustrated.. I have several PV's and on one I'll like the smooth,dense vape but, the flavors just not right..On another the vape is out of control but it burns my throat ( I like to get my throat hit with my juice not my PV)..Yet another has barely any vapor yet has the best flavor...

You've obviously looked into how to control the PV not just amp it up..Nice job

 

[Cancer]

since occasionally using the Janty Stick i got my GF, i like lots of vapor. While my dse-901 occasionally satisfy's that, i went for the 5 volt Prodigy. I love the thought of having a passthrough's voltage in the palm of my hand without wire's

 

[RazorNribbonz]

I love that thought too cancer ( I have a prodigy on the way too lol) But, I am curious to see how it will work with the different adaptors -901-401-510 etc...Will they all run 5v across the board and how that will effect them individually...

 

[Deadmau5]

Thanks Fittech

That actually was one of my questions chief druid (I just forgot to ask it),
does more power equal less drag time?

yesssss.

I work off 3.7 vs 5.2v (3.7v+1.5v) when I feel like I want the extra oomph. it burns through the iliquid wayyy to fast though.

 

[maskgeek]

3.7V + 1.5V = 5.2V seems like a good battery combination. I will try a 3.7V + 1.2V = 4.9V combination.
Is it bad to mix a 3.7V lithium with a 1.2V NiMh battery?

 

[fenez]

I would think that since there must have been some r & d done on these devices from the get go by the manufacturer.... the optimum voltage for use and for longevity would be 3.7volts, I used a box mod my brother made and noticed that I could easily use 10 ml of juice in 2 days which is ridiculous.

 

[nevergonnaleavetn]

Thought we might revisit this topic now that the Prodigy & PS Passthrough are out.
Any opinions?