The device, shown in the schemes, allows you to send the control signals through inside lighting AC current. Homemade remote control can turn on and off various household electrical and radio devices, to open the front door or garage door etc the Remote control can be both stationary and portable. Transmitter and receiver connected to pin jacks AC current inside the apartment.
The principle of operation is shown in Fig. 1. The frequency control signals chosen in the range 1...10 or 60...140 kHz.
Fig. 1
The higher control frequency, the stronger the effect harmful effects of capacitance and inductance of the wiring. Not allowed the signal transmitters penetrated outside of the apartment (house) in Order not to violate the rules in the network include an appropriate chokes and filters. Experience showed that administering a frequency of 1...2 kHz suppression role filter plays the meter housing. Radio interference or television will not occur.
It is impossible to apply control signals to the frequency exceeding 100 kHz. Should also add that the less loaded the home grid, the better the working conditions control device.
The transmitter (Fig. 2) is a transistor oscillator. The coil L1 has 500 turns of wire sew or PEL 0.1 and is wound on a ferrite rod in the magnetic antenna of diameter 8...10 length 50...100 mm. TP1 - bell or filament transformer; B1 - button call.
Fig. 2
Coils L1, L2 of the receiver (Fig. 3) contain 200 of turns of wire sew 0.1 and namati-women-sell-ferrite core with a diameter of 18 and a height of 11 mm or 500 turns of the same wire, but wound on a ferrite rod in the magnetic antenna (6...10 X 50 100... mm); TP2 - bell transformer; relay R has contacts allowing interruption of power to 50 watts.
Fig. 3
The housing of both units dimensions mm made HH plastic and shielded.
Adding resonant circuits, can be obtained multichannel device. As transistors can be used any low-power silicon transistors direct conductivity, for example KT361.
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