Thanks Albert, I did order the sample PCB mostly to check the tolerances on the through-hole components and foot prints to some components in close proximity to each other.Albert H wrote: ↑Wed Mar 10, 2021 1:33 am You're really going to have problems with the eight fine tracks from the switches to the PIC - the way you had it before was much better. In my experience, really fine tracks can be a real problem, even when you get the boards made by commercial PCB companies.
Also - as others have pointed out, the oscillator layout has long tracks, which could make it prone to picking up hum. You really need to tighten up the layout in that area.
If the tracks do not turn out ok, I'll have to revert back to an earlier revision.
The tracks to the OSC have been the main case of criticism, I'll try and see what I can do.