Ohm, .. ohm. get it? its an electrical joke.. see.. never mind.
Yes folks, you too can make your own Cold Heat soldering iron!
Why spend $19.95 of your own hard earned money when you can make your own from the junk you have laying around. As a bonus, the unit you make will most likely be far more powerful than the commercially produced toy and much cheaper to maintain.
I have always been a "why buy it when you could build it" kind of person. I had seen the ads for the Cold Heat product for some time, but never really considered getting one until someone started asking about Christmas gifts (Thanks Matt). I looked up some reviews, and became fascinated in the "how".
We are playing with electricity and heat here. Please take all necessary precautions and be careful. I won't take responsibility for the scorch marks on the cat. Again.
If you're not interested in the science behind all this and just want to get to the meat, skip to step 4.
**NOTE** Many people have had ideas and recommendations (go figure). I'm going to treat this as an open project. I'll be positing improvements and failures at the end or the instructable. Check frame 10 for further developments. Now, back to the story..
Its also somewhat dangerous to have a chunk of metal sitting around at a flaming 250-400+ degrees. People can burn themselves, and sometimes others, like that one time in my basement. And once in the garage. And maybe a few times in the attic. Not that anyone can prove anything.
The science behind the Cold Heat concept for soldering is not magic. Its not alien technology. Its not even that mysterious. The scientific principles behind the tool have been used in everything from light bulbs to space heaters to building cars. It's all about the resistance.
Viva la resistance!!