Homemade COLDHEAT.
My first attempt to build a homemade "ColdHeat" soldering tool. (7/8/2006)
Basically, the "COLDHEAT" soldering tool is just a simple circuit with a resistor (carbon rods), a switch and batteries.

After knowing it, I decided to build my own "ColdHeat".

I found a power connector that holds the carbon rods perfectly, so I used it as the tip connector.
First, I disassembled a pencil to remove the carbon inside (graphite). I was extremately careful when I did this.


Kids: Don't try this at home!



After it was completed, I did a test. Unfortunately, it didn't work properly. The heat generated is not enough to melt the solder. I changed the carbon with another one with less resistance, I made it shorter and still not hot enough.
The picture shows the last version, it melts the solder with fresh batteries (new) but it takes a while. This is not enough to say "It works". What exactly happen and why it doesn't work?
First, the coldheat soldering tool, basically generates heat because the current finds resistance at the thin point of the circuit, so the problem with my homemade "coldheat" is the tip is not wide or thick enough. The resistance on the tip is high and the heat doesn't concentrate on the tip.
I used 9 volts and it works, however, the entire tip gets hot. To fix this problem, I need carbon rods like the ones that are used on carbon-zinc batteries.
As soon I get the proper carbon rod, I will try it again.
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