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WIRELESS_CONTROL

2016-11-15 16:33  
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WIRELESS_CONTROL
Choice of three lamps or appliances anywhere in house and garage, or even in neighboring home if on the same power transformer, can be turned on or off individually with three-channel transmitter that plugs into any wall outlet. Transmitter injects one of three tones (depending on button pushed) into house wiring. Receivers at locations of controlled de-vices are each tuned to one of carrier tones. Correct tone for receiver energizes neon lamp, and resulting light is picked up by photo resistor that energizes latching relay K for turning on controlled device. Relay is released by sending same tone again. Values of CX can be 0.005, 0.01, and 0.02μF, Adjust slug of L2 for each receiver so neon comes on when assigned tone for that receiver arrives.-W. J. Hawkins, Three-Channel Wireless Switch-Use It Anywhere, Popular Science, Sept. 1973, p 98-99 and 121.