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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50 ohm Cable Driver (CB6137E)
This circuit is from an American 1964 documentation. Transistors of the time are used, but modern...
T Bridge Audio Oscillator (CB4689E)
This circuit is from an ancient American documentation. The T-Bridge circuit determines the...
Bargraph Voltmeter LM3914 (CB4959E)
This circuit for the car can be found in other versions in this section. This is from an 80's...