Hi first time posting here. There always seems to be helpful answers and tips.
Okay my question is simply are there any glaring mistakes in my approach to the PCB layout (see image links below), I'm referring to grounding, noise and decoupling more than anything. Which always seem to be a tricky subject with varying opinions on the 'best' solution, I've read just about everything I can find.
The first bit that I'm a little unsure on is what happens to the return path on a differential signal? As I presume it must run back through 'ground' at some point?
How close do you really need to get all the ground points in a DC-DC Buck converter (bottom left of the board). Is it worth adding a 100nF capacitor beside the large electrolytic's on the 24v in-feed side of the LM2575, to help reduce high frequency switching noise on the 24v rail?
The analogue section has been through SIMetrix and looks to be doing what I'm expecting.