Moving hole with the 4017 (CB25433E)

This circuit is from a Radio Electronics magazine from February 1992. The circuit has the effect speed dependent on C1 and adjusted by R3.

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741 Twin T Variable Filter (CB25604E)
This filter, which rejects frequencies around 1 kHz, was found in the August 1993 Electronics Now...
Proximity alarm (CB8195E)
Found in a 90s Popular Electronics, this circuit is based on a common CMOS component. The circuit...
Pulse Coincidence Detector (CB6211E)
This circuit appears elsewhere in this section. This version is from General Electric from the...