Showing posts with label Power Supply - Capacitive. Show all posts
Showing posts with label Power Supply - Capacitive. Show all posts

Thursday, October 15, 2020

Capacitive transformerless power supply schematic for PIR motion sensor NV-1111.35

In the previous article I have explained how a PIR motion sensor works. There you can also find the schematic for the NV-1111.35 PIR sensor which is based on a popular three stage op-amp topology. Understanding this can help you understand other pyroelectric sensors as well.

This sensor is powered by a capacitive transformerless power supply with an output of 8V and 7mA of current.

Capacitive power supply for pyroelectric (PIR) sensors