Interface shield (CB7260E)

This circuit with TTL output was found in a 1968 EEE. The transistor can be of general use. The tunnel diode is an uncommon component today.

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Up to 50 MHz trigger (CB21479E)
This Schmitt trigger in current mode for frequencies up to 50 MHz was found in a 1969 Motorola manual....
Simple SCR test (CB22088E)
VR can be from 50 to 220k it is recommended to connect a 100-ohm resistor in series. The lamp may...
Class A amplifier 2N3055 (CB10542E)
This circuit was published in a 1977 English magazine, but remains current, since we can assemble it...