Remote potentiometer (CB8326E)

This circuit came out in a 60s RCA documentation. The circuit uses common lamps and LDRs but can be implemented with LEDs.

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Automatic Control System (CB18693E)
This circuit was found in a 1998 documentation and its purpose is to automate controls by timing its...
Intermittent Sound (CB1436E)
This circuit is from a 1977 Radio Shack documentation. It produces a modulated sound of good...
Unit gain low pass filter (CB7574E)
This second-order filter was found in old American documentation and can be applied to other...