The presented circuit makes use of two hybrid modules (see articles on the website) to drive a load connected to the relay on the BC548 transistor collector (pin 3 of 4017. The circuit has a range that depends on the location in which it operates (noise, interference, etc.), but normally it will be around 10 meters. The power of the transmitter must be made with voltages of 9 or 12 V depending on the relay, noting that for the receiver the voltage is 5 V, regulated by a zener diode. the transmitter, the operating voltage is 3 V, but the circuit can be powered with 6 V, as there is a regulating zener diode, several loads can be connected to the 4017 outputs to obtain sequential activation.
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