Guru
Joined: 21/06/2018
Location: AustraliaPosts: 1191
| Posted: 10:00am 09 Jun 2024 |
I would be happy for either or neither it does not have to be earthed. I would put it to ground if I had to chose. I believe that KeepIS put it to B-.
The plate does not have to be earthed to ground or B- but it must be connected to the PCB groundplane area (through the 10n capacitor you need to fit). Next step is to put the capacitor of at least 10nF - preferably a multilayer ceramic, from the PCB ground-plane pads to the screw solder pads just near J1. The screw should have a metal spacer to the plate once the plate and the ground plane and sensitive nodes are at the same "noise" potential I believe it should cure your problem.
Edited 2024-06-09 20:02 by wiseguy