This is a Box mod with (1) 14500, 3.7v battery and a Booster Regulator with a Variable Voltage output

New Version has a Variable Voltage Range of approximately3.79v to 6.12v plus or minus a couple of tenths of a volt depending on resistance tolerances. - If you are looking for the Voltage / Resistance Chart, I have discontinued it in favor of the full range achieved by using the resistors shown in the schematic in the next post. I use a 4.7k and a 15k

I recommend a good quality battery.

I am happy to share info with all that drop by this forum. So dropping a mention when you post your mod elsewhere would be a decent gesture.Show your support by signing up as a member and please participate by posting.

I used the same PTN04050 booster regulator that I built my copper mod. The difference is that I used a 14500 battery instead of an 18650.Right now there are no caps in the input and output of the regulator. Awaiting the cap if I can squeeze them in. Works great without them though. This little baby really puts out

Update: Caps installed. Made a difference. Battery is not drained as fast when holding the fire button.In the schematic I used a 14500 Trustfire. Do yourself a favor and use a good quality Hi-Drain battery for optimum results.

!!!!!Always read to the end of the thread, as parts/circuitry and results change due to extensive testing and use!!!!!

Here's an update on battery life with the (2) 100uf caps.I was getting about 4 hours with moderate vaping and w/ no caps.Now I got 6 hours with heavy to moderate useand 7 1/2 hours with moderate usage.Been through about 4 or 5 charge cycles.

Hey breaktru, I see you did it again. Fantastic mod dude. I copied your Copper Mod and now I want to build the .44 mini mod. You made it so easy with all the info here. I don't have a mod that size and need to build one to widen my collection. I guess as a novelty mod. Love the button rim. Got to get to the gun range and find some brass lying around.

Still using your fantastic eJuice Me Up calculator on a daily bases. It's always open on my desktop for quick use. And love the PV Tune tool you added: http://ejuice.breaktru.com

I've read on other forums that people are offering to buy your mods. Keep up the good work and I appreciate and I am sure others appreciate your dedication on helping others get started in the vaping community. If everyone you helped donated 10 cents, I bet you would be a rich man. Bless you for that.

Got to have one. That's a beauty and it would fit nice in my purse. PM is coming for having one made breaktru. I can deal with 7 hours of vape time. I'm a light vaper and it will last me a lot longer I'm sure.

I read that the .44 mod is using small Electrolytic Capacitors. You also say that your can use the Tantalum Caps. Any reason why?BTW, just love this mod. I'm waiting for the parts to build one. If I don't succeed, I would like to buy one from you ole buddy ole pal of mine. PMing now.

I read that the .44 mod is using small Electrolytic Capacitors. You also say that your can use the Tantalum Caps. Any reason why?

Actually yogi, Tantalum is an Electrolytic capacitor. (Wikipedia)There are two types of electrolytics; aluminum and tantalum.The tantalum capacitor is a highly reliable type of solid capacitor or electrolytic capacitor. Surface mount tantalum capacitors are increasingly being used in circuit designs because of their volumetric efficiency, basic reliability and process compatibility.

So yogi, to make a long story short, I use tantalum because of their smaller surface size. They are more expensive than the aluminum. If you can find a smaller enough aluminum one, go for it. I found small aluminums in an old motherboard, otherwise I would have used the tantalums in the .44

Very educational capacitor posting.I didn't know that tantalum was an electrolytic. I had bought several varieties of aluminum elect. caps and they are way to big to put in to a mod that small. Wish I had some old MBs around to scavenger. Probably go with the tantalums.

Trying out the Dual Coil on my mods. On my .44 with the booster and small 14500 battery, I have to crank up the voltage to 5.0v. Any lower voltage cuts out the chip. The booster with an 18650 (2400mah) battery works very good with lower voltages with the same Booster circuitry.

Update:I want to clear up the above statement.

NOTE: The Dual Coil I have is 1.5 ohms. Two 3ohm coils in parallel They are totally different than a 510 LR at 1.5 ohms. They are not hot like LR's. You can use D.C. at almost any voltage and not burn or effect the juice taste IMHO.I am using the D.C. on the .44 @ 5v right now and it doesn't taste any different than a standard 510 w/ standard voltage (not hot or harsh). Vapor production is VERY good with the D.C.

The capacity of a smaller battery (14500, 900mah) is probably the factor. Pushing a regulator with a low resistance load drops the output down causing the reg not to fire. I also SAID above that it works fine with a 18650 battery at lower voltage.

Update to the UpdateThe above was with the first .44 mod. Don't know why I had to crank it up to 5v for Dual Coils but the new3.79v to 6.2v (approx) range can handle the 1.5 ohms w/ NO problems at lower voltages.

I really like your little buck/boost .44 mod, however I have a question: It looks like you are using a single 14500 (non high drain) battery; didn't you ever run into problems with the protection kicking in at higher voltages? Because I've made some mods with a boost circuit on a 14500, and they seem to work fine at the lower voltages, however above about 4.3 V the battery protection seems to kick in after a few drags. Obviously the 14500 I'm using doesn't like the higher current.

I think the way to combat this is to use a PWM circuit to "trick" the protection circuitry so it doesn't kick in (kind of like what the eGo does). However it looks like you were able to get the thing to work over the whole range, is that true?

Nice work on the mod, BTW.

breaktru - Today 08:49 AM - permalink Edit Report My Response:It's not the battery protection that's kicking out but the regulator shutting down when the Max limits are exceeded. The Booster is rated at 12 Watts max. What atty resistance are you using at 4.3v. If you tune your voltages accordingly to the atty resistance, you will be fine. Even the ProVari and the Darwin will shut down when the atty is too low.I have no problems vaping through ALL the voltage ranges, even at 6 volts as long as you have the right resistance.Check out my "PV Tune" included in the "eJuice Me Up" Calculator.

First time building one this advanced, but Im pretty excited about it.

Actually I do have one question...I have found that my sweet spot is ~4.6v. How much would be changed to eliminate the POT and set it there? I am pretty sure I'd just use 1 resister between Vadj and Vout, but I want to be sure.

First time building one this advanced, but Im pretty excited about it.

Actually I do have one question...I have found that my sweet spot is ~4.6v. How much would be changed to eliminate the POT and set it there? I am pretty sure I'd just use 1 resister between Vadj and Vout, but I want to be sure.

That's great to hear Dalton. I would think about using a fixed resistor. That will limit you to always using the exact atty resistance. With VV you can adjust to 4.6v with any atty.

The touch mosfet that Alan posted is great. Remember to check the physical size as the space inside the box is small. There are miniture mosfets out there, don't have numbers for you. You can search the ECF forum for Scubatdan's.I put a touch in my Side by side.

That's great to hear Dalton. I would think about using a fixed resistor. That will limit you to always using the exact atty resistance. With VV you can adjust to 4.6v with any atty.

The touch mosfet that Alan posted is great. Remember to check the physical size as the space inside the box is small. There are miniture mosfets out there, don't have numbers for you. You can search the ECF forum for Scubatdan's.I put a touch in my Side by side.

Haha pointing out what should have been obvious to me...Good argument for the POT. Alan was gracious enough to send me a couple mosfet's, so I am waiting on those, and also the 100uF caps, but I think I can get it to all fit, although it will be tight.

Like Alan said, use the first diagram that you drew. You want to break the power feeding the regulator.You may want to tweak the value of the Gate to Source resistor. Alan said he had trouble turning it on. The original circuit for the 3103 shows a 2-4meg ohm if Alan couldn't turn it on with a 10meg, obviously 2-4meg would not do it. 100meg will work but may be too sensitive. I would set it up in a test board and try values from 20 meg to 100 meg gradually increasing.An important note is that after coming up with a resistor value that turns your mosfet off and on w/ full voltage, it is necessary to add a load of an atty. I had to bump up the value of the resistor w/ a load although it worked fine w/ no load.

Update:The touch works very good in the .44 boost mod w/ either an N-Channel or P-Channel.Just remember when using an N-Channel to route ALL of the negatives through the Mosfet or the DC Converter will remain on.

Ok thanks. I have the circuit set up now and I think it will all fit just fine. I have read that the diode before the atty is not required, but I have used a 22k resistor to give it a range of 3.77 - 5.18. If I eliminate the diode, is it safe to assume that that range will be .6v higher at both ends?

Ok thanks. I have the circuit set up now and I think it will all fit just fine. I have read that the diode before the atty is not required, but I have used a 22k resistor to give it a range of 3.77 - 5.18. If I eliminate the diode, is it safe to assume that that range will be .6v higher at both ends?

Yes without the diode it will be approximately 0.6 volts higher on both ends.

The diode was added prior to realizing that the resistors can accommodate an acceptable voltage range.I will alter the table eventually without the diode.

Ahhh the plot thickens...So I can go without the diode but I would need to replace the 22k resistor with something smaller, to get the appropriate range. Looks like I need to sit down and do some math.

Very interesting discussion!! I don't know if I would leave the diode out. I suspect that it is used as a 1/2 wave rectifier to avboid the circuit from going into oscillation. Of course, I am just guessing but suspect that's why TI put it in the diagram

Checked on radioshack.com and you can get 3 amp diodes for a buck and a half.

Very interesting discussion!! I don't know if I would leave the diode out. I suspect that it is used as a 1/2 wave rectifier to avboid the circuit from going into oscillation. Of course, I am just guessing but suspect that's why TI put it in the diagram

Checked on radioshack.com and you can get 3 amp diodes for a buck and a half.

Alan, I added the diode just to achieve the voltage range in my preliminary tests. It's only there for voltage reduction and have since removed it because I found a better resistor/pot combo that works great.

I tried leaving out the diode and used the 15k ohm from your table. And it gave me 0.6volts added to the low and hi end.So my low end is now 4.2 volts. I really don't need to go any lower so it's perfect. Besides with the load it's a little lower anyway.

I see that Silent Soldier (above posts) made a .44 and posted it over at ECF.Hey S.S. it would be COURTESY to give recognition to those who help out on mod builds.I see breaktru giving thanks to several modders over at ECF.

I see that Silent Soldier (above posts) made a .44 and posted it over at ECF.Hey S.S. it would be COURTESY to give recognition to those who help out on mod builds.I see breaktru giving thanks to several modders over at ECF.

Thanks Brian and HiLeah for your support.It's all good.It's not the first time and won't be the last.I get tons of PM questions on HOW to on all my mods.I've supplied schematic help on wiring and part numbers to many.

I see that Silent Soldier (above posts) made a .44 and posted it over at ECF.Hey S.S. it would be COURTESY to give recognition to those who help out on mod builds.I see breaktru giving thanks to several modders over at ECF.

Well, gee whiz guys, this is starting to get a little brutal ... I have very few original designs, mostly modifications of other people's work, often a combo of several different mods, would be hard-pressed to give credit to all of the originators. This whole world of mods is growing so fast it makes my head spin.

I think Breaktru makes wonderful mods and I hope, some day, to be worthy to walk in his shadow. In the meantime, if I stumble upon any cool idea that someone else can use and improve on, they have my blessing to do so.

I hope that you made your feelings known to SS with a PM on ECF, in a diplomatic way. If not, you really should. (boy, that's a lot of acronyms). The same goes for me too .. if I step on someone else's design, by all means let me know the error of my ways, ok?

I am very grateful breaktru for your informative postings and all the help you gave me when I PM'd you with questions for building my .44 booster mod.Copying is the best form of flattery to the creator.

Alan, It doesn't seem that breaktru is upset, but it seems that some of his mod build followers maybe.