Computer remote wake-up can remotely start the computer through the network card, and remote assistance is a very useful network function. We are now introducing a practical circuit diagram for synchronizing work between the host and one or more controlled devices to complete remote wake-up and shutdown. The circuit uses a 220 volt AC circuit application as an example. In the main control circuit, after the power socket x1 is connected to the load and the power is turned on, a current flows through the bridge rectifier D, generating an AC voltage drop of about 1.2 volts or more. At the same time, through the resistors R1, R2 and R3, R4 resistor current limiting, in the positive half cycle and the negative half cycle of the AC power source, the optocouplers G1, G2 alternately flow current, the voltage is limited to about 1.2 volts to protect the optical coupler. After the phototransistor of G1 and G2 is turned on, after the transmission of the long-distance wire, the circuit composed of G3 is controlled, the control relay J1 is activated, the relay J1 is normally open contact J1-1, and the electric appliance that needs to be turned on synchronously is controlled. The normally closed contact J1-2 is disconnected, and the appliance that needs to be disconnected is controlled. Since the circuit uses two optical couplers and capacitors C1 and C2, it effectively prevents relay jitter. In circuits that require time-delay closure and time-delay disconnection, increasing the capacity of C1 and C2 can be very simple to achieve the effect of delay closure and disconnection. Diode D1 absorbs the self-induced electromotive force generated by the J1 coil to protect the G3 from safe operation. The part inside the dotted frame can be installed in parallel as needed. The circuit in this paper can be used in AC or DC circuits to effectively remotely control the opening or closing of remote electrical equipment. As shown below. 
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