three-level touch control (CB7040E)

Found in Popular Electronics this circuit uses common components to control an incandescent lamp with three levels of intensity

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Power Failure Detector (CB5951E)
This circuit triggers an alarm in the event of a power failure. The circuit is from an 80's...
Digital Tachometer (CB24543E)
We found this circuit in the April 1978 issue of Radio Electronics magazine. The 2-digit circuit uses...
2 Hz Generator (CB25777E)
This CMNOS crystal-based circuit generates a 2 Hz signal. It was found in the October 1994 issue of...