A soldering iron temperature control cycle timer from PCB Smoke:
Shown below is a photo of the unit that started me thinking about how to find a way to control the temperature of a regular plug-in soldering iron. The unit got very hot the first time I used it. It has a built-in adjustment dial. Even after I turned the dial way down, the solder quickly boiled away and the tip started to oxidize. It seems to work pretty good, now with this new circuit.
Check out the video after the break.