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DER-865 Using Live as Ground (reference).

Posted by: gid204 on 11/03/2021

Hi, I was wondering why you used the source of the back to back MOSFETs as ground, was there any specific reason for this? I am wondering if this could be replaced by using live input as ground?

See attached photo for edited schematic, refer to red arrows for changes.



Attachment Size
Live ground.png 272.95 KB


Submitted by PI-Crumb on 11/16/2021


We used the source as reference to be able to provide the required VGS to turn ON the FETs. I don't see how the circuit would work by using the live input as ground and floating the Source pins.