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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DC Car Adapter (CB26286E)
This circuit can be used to power 6, 9 or 12 V devices in your car. The maximum current is 1.5 A....
Low Pass Ative Filter 741 (CB853E)
This is a simple configuration for a low-pass filter using a 741 operational-amplifier. Other...
12 V battery indicator (CB9137E)
This circuit with two LEDs indicates the status of a battery with two reference voltages. The LEDs can be...