Voltage Monitor MC34064 (CB14536E)

The component used in this circuit is uncommon today. The circuit is from Motorola's 1990 Linear Databook.

Telegraphy Practice Oscillator (CB18342E)
This very simple oscillator, with only one transistor, was found in a Japanese magazine in 1967....
Simple sound bridge (CB6069E)
This simple bridge circuit can be used for impedance or resistance measurement using a high...
Light-controlled oscillator (CB7874E)
This circuit has the intensity of the signals controlled by the light that falls on the sensor....