This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time and are not given information about the driver transformer. Note the high supply voltage.
This circuit can be used with common drills connected to the 110 V network. With change of R1 and...
This General Electric circuit was found in a 1964 documentation. The circuit triggers a relay when...
We found this circuit very simple in an old documentation. The relay is high voltage sensitive, but...