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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Active Cut-Out Amplifier (CB15422E)
The amplifier shown in the figure was obtained from the Anlog Devices linear integrated circuits...
Silk Screen Printing Timer (CB4652E)
If the reader still uses silk screen printing tables this is an interesting circuit found in a 1994...
Stereo balance test (CB9106E)
This circuit monitors the output of a stereo amplifier, checking the balance and balance between...