The remote alarm device includes two parts: an infrared sensor wireless transmitter and a receiving sound and light signal machine, as shown in (a). Solid State Relay,Relayrelay Electrical,Motor Overload Relay,Dc Coil Contactor NanJing QUANNING electric Co.,Ltd , https://www.quanningtrading.com
The infrared sensor wireless transmitter is composed of an infrared sensing module, a timing control circuit, a voice generator and an FM transmitting circuit, as shown in Figure (b).
The infrared sensor head uses the HN911L in the pyroelectric infrared sensing series module. The L at the end of the model indicates the micro power consumption type. The quiescent current is only 20μA, and the power supply voltage is 6V (other models are 5V). 