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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Old amplifier (CB23684E)
This is a 1960s amplifier setup found in a period publication. The circuit uses a special driver...
100 kHz Oscillator (CB22256E)
This circuit was found in an American transistor book from the 50's. The indicated transistors are germanium...
Mini Central for Intercoms (CB18747E)
In fact, we can say that this circuit found in documentation from the 90s, consists of an intercom...