Long maintenance circuit (CB8866E)

A 0 V signal initiates sampling on this circuit suggested by documentation from the 1970s. The integrated circuits used are uncommon today.

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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...