I'm needing a VV high current power supply. I will be using an ATX psu from a PC rated 25A@12V. Just looking for a good way to regulate voltage from 3-10V while pulling max current. I have looked into VV buck converters but none have the amp rating I'm looking for. Using this power supply for vaporizing purposes, the load durations will only be a few seconds, do I need to worry about overreaching the current limit? i.e. can a regulator circuit take twice max current if only for a few seconds? I know most datasheets are showing you constant use limits. The reason for the high current requirement is the load(20ga Kanthal wire) has very low resistance and 12vdc high current psu's are cheap..

Maybe I'm just not looking at the problem correctly I'm looking for a low cost solution; I know I can go out and buy a power supply($200+) the fits the bill but I would like to build my own. I'm not classically trained in electronics but am willing to take any advice/knowledge you can provide..

Try going to radio shack lots of power stuff and electronics