Pulse sampling (CB8881E)

This circuit was found in a 1966 EEE. Transistors support modern equivalents and the waveforms are given next to the diagram.

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Twin-T Oscillator with Diode Regulation (CB12431E)
This circuit is from a 1995 Electronics Now. It generates a 1 kHz sinusoidal signal. See in the...
Signal generator CIR15041S (CB7922E)
This oscillator, which can be used as a signal injector, was found in a Popular Electronics from the 90s....
Programmed Oscillator (CB22404E)
This circuit was found in an English documentation from the 90's. The circuit has the frequencies...