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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Regenerative pulses for playback (CB7304S)
This circuit used in tape recorders was found in an Electronic Design. The components support...
Car Battery Power Supply (CB25689E)
This circuit was found in the February 1994 issue of Electronics Now magazine. The circuit uses 6...
Pulse Width Modulator (CB5364E)
This circuit is from an old operational amplifiers manual. However, the setting applies to modern...