Temperature control (CB21275E)

This circuit was found in an Electronic Design from the 90's. It makes use of components from the time. Triac is according to the controlled load.

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Dual 18 V power supply (CB25266E)
Suggested to power the previous circuit, this power supply was found in the December 1990 issue of...
Autotransformer (CB24077E)
This is a very useful autotransformer circuit on the bench. We found it in the September 1970...
Driver Darlington (CB8957E)
This circuit was obtained in a 1960 documentation of General Electric. It is applied in the...