Universal power control (CB8709E)

This circuit was found in a 90s Popular Electronics. The circuit uses several relays in order to obtain different controls for power loads.

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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...