At least one of the linked circuitsTemperature-Controlled Soldering Iron Circuit Diagram does exactly what you are asking for. (Don't know, if it actually works with your your solder iron's heater element). May be, you didn't notice the circuit. Or not understood it.
@Syncopator. The current/resistance measure was a great idea. Thanks, I'm working on it.
I've read about shunt resistor circuits for current measurement these last days, as is the method I'd be using for the current part, and so I wanted to ask whether it really makes a difference if the soldering iron is driven with AC or DC?
Do you mean, the Hakko 907 iron has a separately connected temperature sensor? Then you don't need to measure the heater resistance to know the temperature.Also, thermocouples seems a bit more difficult to handle than the sensor this soldering iron comes with, due to the need for cold-junction compensation. I also plan to buy one of those when I have this one working.
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