Radar detector (CB8628E)

Found in a 90s Electronics Engineering, this circuit makes use of components of the time. The critical component is the microwave sensor diode.

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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...