The application is a three-phase three-wire system, that is to say, there is no neutral line, and the requirements are as small as possible, and there are fewer components. When it is judged that the phase is missing, it only needs to turn on an LED light, regardless of which phase is missing. Ask someone familiar with this area for advice.
Mateo ポストする January 20, 2021
Try if this circuit can be used:
Lola ポストする January 20, 2021
The circuit upstairs meets the requirements of LZ
Jeffrey ポストする January 20, 2021
The above circuit can fully meet the requirements of the landlord, and it can also reduce J3
