An electronic cigarette is not as complicated as people tend to think: BATTERY, SWITCH, ATOMIZER CONNECTOR, ATOMIZER (or cartomizer) JUICE
The real magic happens inside the atomizer, which is pretty much just a heating element which works by having a resistance across a really small gauge wire thus creating heat. The length and gauge (thickness) of this coiled up wire is what determines the "OHMS" or resistance which in turn determines the WATTS (power) put through the coil bringing the liquid to optimal vaporizing temperature. But that's a simple example, using the standard 3.7v lithium ion without adding any more batteries in series creating more voltage (FORCE). Think of water going through a pipe, voltage is how fast it goes through - amperage is how much is going through. Watts is a measure of VOLTAGE X AMPERAGE. Though the actual voltage going through the point where the coil is depends on it's resistance (think of water going through a smaller pipe, it's gonna have a harder time going the same speed/amount. When electricity is pushed through a smaller "pipe" at the same amount, the energy lost (voltage drop) is dispersed in the form of heat)
If you have a general understanding of how Direct Current works, you will have an understanding of how a box mod works without needing a diagram or specs.
http://www.allaboutcircuits.com/vol_1/index.html
And that's if you wanna actually learn something as you go along. If you just want a cheap box mod made by yourself, madvapes has kits
http://www.madvapes.com/Mod-Kits_c_187.html - or you can just click on the Modders section of the forum. Check the tutorial links sticky or search up say "simple box mod"
