This circuit was found in a Popular Electronics from the 90s. It is based on components still common today and an optical coupler for the triac. The sensor is a thermistor.
This constant current source is from the LM11's own factory manual used in the application. The circuit is...
This circuit, from a 1988 documentation, consists of an automatic temperature control using an NTC...
With this name we already published an interesting game. For readers who do not know, this game...