Optical isolator (CB9165E)

This circuit was found on an old EDN and can be used as a shield. Optical couplers are from the era and modern equivalents can be used.

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10 MHz counter (CB20128E)
This meter has a 0.001% tolerance and was found in an old American publication. The circuit has a...
Power Line Transmitter (CB19423E)
This transmitter was found in an old publication on espionage. It applies a signal of a few...
Thermometer LM3911 (CB19203E)
The LM3911 from National Semiconductor (Now Texas) is a temperature sensor that provides an output...