This post shows how to add a K-type thermocouple to a 120 volt plug-in soldering iron for use with a PID temperature controller. This is a follow up to a previous post on the Soldering Iron PID Temperature Controller. Please see the previous post for more details on how to add a thermocouple to a plug-in soldering iron with a mica heating element. The method I used here was basically the same.
This second version has a few improvements. It uses a better soldering iron that gets hotter and heats up faster. The PID controller is able to work at higher temperatures than the previous version plus this version uses an SSR to switch the soldering iron on and off. The solid state relay has no mechanical parts to wear out plus it is capable of much more precise switching than a mechanical relay. (more…)
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