PCBWay 3rd PCB Design Contest

Dose separate DC power require for "LIGHT AND MOTION SENSITIVE LAMP" Circuit?

Engineer asked Jun 29,2020
  1. If  "LIGHT AND MOTION SENSITIVE LAMP" circuit run by 220VAC then will it automatically power the sensor and relay or separate DC power needs to apply?

  2. Why there are two relays in above circuit?

  3. Does it work with IR sensor too?

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