AC Tachometer (CB9353E)

This circuit was found in a 1969 EEE. It detects when there is a phase failure in a circuit using an inductive sensor.

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LASER Driver (CB21008E)
We found this circuit in an American publication from the 1990s. The circuit has a Darlington...
Light Alarm with the 741 (CB12591E)
The sensor for this alarm is an LDR and it consists of an oscillator that goes into action when...
Stepper Motor Drive (CB13797E)
This circuit was found in a computer publication from the 1970s. The transistors can be the BD135...