Pyroelectric infrared sensing socket with analog sound circuit (BISS0001)

The circuit is shown in the figure. It consists of a pyroelectric infrared sensor, an infrared signal processing circuit, a relay control socket circuit, an analog sound circuit and an AC step-down rectifier circuit. When someone walks into the pyroelectric infrared monitoring field, the socket is powered and the electrical equipment on it starts running; at the same time, the analog sound circuit sounds to remind the owner of the equipment that it has started running.