Temperature led for Weller WTCPs

An indicator is nice, but how to implement that? Because all the intelligence of the heat regulation happens inside the soldering iron, the station itself is just a big 230->24V-transformer and an on/off-switch. Running an extra wire to the soldering iron to sniff out its status wasn’t an option. There is another way to get info about the actions of the Magnastat-switch, though.

tmb-IMG_2049schematic

Source: spritesmods

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