/diy/ - Do It Yourself

>open up my old soldering iron with the analog temperature dial on the side
>has four wires going into the tip
Wait does this actually have a thermocouple or something in the tip? You guys told me all of these had TRIAC dimmers instead of proper temperature feedback. The main IC says:
>358
>GZS46
With an ST logo on it, so I'm guessing it's an LM358 dual op-amp. I'm interested to see the circuit, as it runs directly off mains. There's a power-resistor near the op-amp and what could be a zener, so I assume it's some sort of DC supply.