I'm working on a electronic load and it's not very sensitive to noise, the questions are mostly out of curiosity.
On the PCB I have a fan control circuitry that I separated the ground and positive path and going to connect them separately with a twisted pair of wire directly to power supply. is doing this helps to prevent the fan noise to spread?
There's a high current path on the PCB (marked with arrows) that I have to join its ground with analog ground, is two grounds connected together correctly (marked with circle)?
I'm measuring voltage drop over a shunt (marked with square) with a diff-amp, is the differential path connected correctly?
I'm a bit confused about ground loop, the ground plane goes around the PCB. meaning a single node can have two paths to ground. Do I need to cut the trace (marked with X) so that current flows only in one direction?