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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Two-Transistor Darlington Amplifier (MSB035)
This two-transistor amplifier can be used as power stage for intercom, experimental receivers,...
Proximity Relay (CB25343E)
This proximity relay circuit was found in the July 1990 Radio Electronics magazine. The supply...
Bench thermometer (CB20501E)
With an ultra-low consumption, this circuit can be powered by solar cells. The circuit is from a...