This circuit was obtained from a 1967 General Electric manual. The circuit makes use of absolutely current components. Similar versions from other sources can be found in this section.
This circuit was found in an old Popular Electronics. With it we can check the operation of a...
This circuit triggers a relay when the set temperature is reached. The circuit is from an old...
Suggested by General Electric in a 1965 publication this circuit uses a light bulb. Can be changed...