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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Voltage Divider for Dual Supply (CB400)
This circuit split the voltage of a Power supply allowing it to be used as dual supply. The limit...
FSK Circuit with 4046 (CB25770E)
This modem circuit using a 4046 PLL was found in the October 1994 issue of Electronics Now. The...
Pre-amplifier Using the 741 (NI004E)
This simple circuit presents a voltage gain of about 1,500. The input impedance is high and the...