Infrared remote control relay circuit b

For the transmitting circuit, turn on the power, the infrared light-emitting diode emits light, the receiving circuit is as shown in the figure, the transistor
3DU5 that receives the infrared light outputs the received signal through the NE555 timer 3 terminal, so that the relay coil is electrically attracted, and the The normally open contacts are reunited to make the load work.