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.
This circuit, suggested by General Electric, increases the sensitivity of a common multimeter to 1 M /...
This circuit was found in Delco documentation from 1965. The transistor is of the time, but any...
Employing a unijunction and a triac of the era, this 1964 Electronic Design circuit uses a diac to...