This semi-proportional temperature control was found in old American documentation. The components are from the period and the maximum power of 2.4 kW.
This counterphase circuit is from a 1973 publication, and can work with mains voltages or 12 V....
This circuit can be used to directly control direct current loads or higher alternating current loads...
The acquisition of data, from a transducer, so that these data can be converted to digital form...