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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2.34 kHz oscillator with the LM3900 (CB13843E)
Of course, other frequencies can be generated by changing the components. The circuit generates a...
Audio Visual Thermometer (CB18469E)
This circuit was found in a 1974 publication. It provides a tone indication of the temperature sensed by...
FM Transmitter Powered by The Power Grid (CB17354E)
This spy transmitter can be plugged directly into a power outlet. The power comes from a regulated...