This circuit triggers a relay when the set temperature is reached. The circuit is from an old documentation. The relay may be equivalent according to the transformer secondary voltage.
Bis This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine. The...
This circuit with complementary output transistors was found in a 1980s publication. Modern...
Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be...