Remote control socket circuit

The infrared remote control socket is mainly composed of three parts: power supply, infrared receiver and socket power on and off control. After the mains power is connected, the AC mains
current is limited by cI, rectified by VD1 and VD2, filtered by G, and stabilized by VD3 to obtain the iov DC voltage, as shown in Figure 18-48.
    One channel of this voltage is added to the positive electrode of the red light-emitting diode VD4 through Rs, and the other channel is further reduced through R, and Ca is then filtered to obtain an approximately SV operating
voltage. One channel of this voltage is filtered by the inductor L to filter out high-frequency interference and then added to the ③ pin of the infrared receiving IC power supply terminal; the other channel is directly sent to the dual D trigger
power supply terminal @ pin and ⑨ pin.
    When pressing the remote control button. The infrared ray emitted by the remote control is received by the infrared receiving diode VD5 and converted into an electrical signal. It
is sent into the IC through the 1CI pin ⑦. After shaping, amplification and decoding, a set of negative pulse signals is output from the ① pin. So the c pole of VT1 outputs a positive pulse, and
its trigger signal reaches the trigger terminal ⑩ pin of IC2. Because pin ③ is low level, pin ⑩ and pin ⑨ are connected to high level , and its output terminal @ pin should output
low level , that is, pin ③ of the trigger terminal inputs low level, because pin ② is connected to pin ⑤. is low level, pin ④ and pin ⑥ are low level, and pin ① of the flip-flop
outputs high level. Then the control tube VT2 is turned on, and the bidirectional thyristor VTH is turned on, so that the electrical appliances on the socket CZ are powered, and the light-emitting diode
LED1 is lit at the same time, and remains in this state. If you press the remote control button again , the trigger will turn, pin 0 will output a low level , and
the thyristor will turn off. LED1 goes out at the same time, and the electrical appliances on the socket stop working. In the figure, R,, cI and ruler,:, G have a certain delay effect.