Yah, I know it ain't fancy, but it works great and it only cost me a few bucks to make 
Hi, made this for a lodge brother, by special request. I did not take pictures as I built it, though I thought you may find it interesting ...
It is based on Donptal's "Poorvari" and provides up to 3 amps at a range of about 1.2v to 6v or more. It uses 2-14500 batteries. It will support any 510 atty or carto, tested it with my G3 tank, YUMMY!!It also includes a 3A Goodprophets horn button, LM350T VV regulator, 1K multi-turn trim pot and an LED.
Here it is from the front:

Note the horn button, LED, master switch, and voltage adjustment screw on front.
Inside view .. note that most components potted with hot glue to prevent components from shifting around and shorting or breaking a wire. The VV reg was NOT potted, it needs to dissipate heat.:

Hot!! (notice LED on)

Let's try it out...

Well, there ya go! A compact vaping monster!! I would suggest you stay away from a LR carto with this monster, I burned out a 2.4 ohm carto in testing this mod. It has plenty of vrooooom to push a HV atty or carto (which, I believe, is 3.2 ohms or more).
I will do another as a "hot to" thread when I have the time.
Alan
Hi, made this for a lodge brother, by special request. I did not take pictures as I built it, though I thought you may find it interesting ...
It is based on Donptal's "Poorvari" and provides up to 3 amps at a range of about 1.2v to 6v or more. It uses 2-14500 batteries. It will support any 510 atty or carto, tested it with my G3 tank, YUMMY!!It also includes a 3A Goodprophets horn button, LM350T VV regulator, 1K multi-turn trim pot and an LED.
Here it is from the front:

Note the horn button, LED, master switch, and voltage adjustment screw on front.
Inside view .. note that most components potted with hot glue to prevent components from shifting around and shorting or breaking a wire. The VV reg was NOT potted, it needs to dissipate heat.:

Hot!! (notice LED on)

Let's try it out...

Well, there ya go! A compact vaping monster!! I would suggest you stay away from a LR carto with this monster, I burned out a 2.4 ohm carto in testing this mod. It has plenty of vrooooom to push a HV atty or carto (which, I believe, is 3.2 ohms or more).
I will do another as a "hot to" thread when I have the time.
Alan