I just recently got in to the "mod" stage of vaping. I had heard about and seen a lot of box mods and I wanted to build one just for the fun of it. The only purchased part was a 510 connector, every other part was already on hand in my basement. The controller is a simple mirocontroller setup with a potentiometer input to set power output. The transistorized PWM output drives a 31A mosfet. There is no battery connections as I wanted to use a large 50A 0-15vdc power supply I had collecting dust. Of course this means it isn't very portable, but it was fun to play with! We ended up burning up the switch after messing with it for an hour or so. I never meant for it to go above 5vdc but we got a bit carried away and before we knew it we were almost to 15vdc!
Here is a video of it in action:
Liquid Nics custom made Box Mod - Chuck breaking 250 watts! - YouTube
Here is a video of it in action:
Liquid Nics custom made Box Mod - Chuck breaking 250 watts! - YouTube