My 40W soldering iron is a bit too weak. I've been thinking about making a soldering gun, but it confuses me a bit... Since I don't work with sensitive electronic components, I don't think there's a problem. I also like the fact that I can control the amount of heat easily... I soldering gun is pretty much a "mix" between a soldering iron and a welder, right? Similar to a hot-wire styrofoam cutter. Maybe I should call it an Incandescent soldering lamp... A hot wire cutter is exactly like a soldering gun, except it uses a thicker, shorter, wire that has low resistance... To make one, what I need is a power supply that can supply: High current, and low voltage (Wikipedia doesn't define low voltage), right? With a 5V 40A ATX power supply, a switch, and a single core wire that has close to 0 resistance, do you think I would be able to make a soldering gun? A 5V ATX power supply is the power supply with the lowest voltage that I own. I don't know the resistance of the wire that I can use, because I don't know what wire to use, and don't know the current it will take. I know I will need the heating wire of the tip to be a higher gauge, so it will have more resistance on high amps, and it will be the one that will heats up. From what I'm guessing, 5V is too high, and something like 1V would be better. Perhaps I'll find a way for stepping it down to a lower voltage...