1 kW synchronized switch (CB9266E)

Found in a 1967 RCA documentation, this circuit can be made with equivalent SCRs according to the load.

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Variable zener diode (CB9969E)
In the figure we have the way to implement a 5 to 45 V zener diode with 50 mA of maximum current...
Optical Audio Link Receiver (CB13886E)
We found this circuit in a Radio Shack documentation from 1977. The circuit serves for a link of...
Broadband Buffer (CB13645E)
This circuit was found in the 1977 National Semiconductor FET Databook. The FET can be the BF245...