Frequency Marker (T465E)

This circuit was found in Popular Electronics from December 1968. It produces signals at the frequency determined by the L1 setting.

Colpitts Oscillator (CB6185E)
This circuit was obtained from an American 1980s documentation. The frequency depends on the...
Contactless temperature sensor (CB7109E)
Found in an American documentation from 1968, this circuit senses the temperature through an...
ooooooo/ 1 kHz Sine Oscillator (CB4614E)
The circuit shown in the figure consists of a phase shift oscillator and its components have been...