There are lots of resources on the WWW about how to lay out circuit boards. Here's one of many:
https://www.circuitbasics.com/make-custom-pcb/
I have developed a few basic guidelines for laying out pedal PCBs:
- Every trace must be "star topology". Make sure a trace never reconnects with itself.
- Keep the input buffer physically as far away as possible from the voltage amplifier.
- Ensure anything that draws lots of current connects as closely as possible to the power connections on the PCB.
- Make the power traces as large as reasonably possible.
For this board there are 5 potentiometers. In a "BB" size case that pretty much limits the potentiometer form-factor to 9mm. Something like this:
http://smallbear-electronics.mybigcommerce.com/9mm-1/
With a bit of thought it became clear that the primary mount of the PCB to the case can be using using the potentiometers. Specifically, this kind:
http://smallbear-electronics.mybigcomme ... -pc-mount/
These mount on the back of the PCB and secure the PCB to the case.
For the 9VDC I've always used something like this:
http://smallbear-electronics.mybigcomme ... tic-round/
But it connects to the PCB with "flying leads" which are a pain in the butt (every wire in the pedal takes a few minutes to make, and is a potential failure point). For the 32 OD I've decided to go with something like this:
https://www.mouser.ca/ProductDetail/CUI ... 3M4A%3D%3D