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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Digital resistance control (CB7551E)
This circuit simulates a resistor controlled by digital signals. We found it in American...
Full Wave Control (CB6554E)
This 1968 Texas Instruments circuit uses diacs of the era. SCRs can be modern equivalents according...
Continuity Tester (CB26192E)
This simple continuity tester consists of an oscillator found in the 1983 Electronics Experimenter Special...