/diy/ - Do It Yourself

>>1269713
You just trace things through, in order. Have some idea of what you should expect to see, put a scope or a voltmeter on it, and see if it checks out.

>>1269702
There are options for fabbing boards. There are a dozen manufacturers who will take manufacturing output from your pc board layout software and build the board to order, with varying options at varying price levels, usually priced per square inch. Boards can also be made at home if in a hurry and/or one can deal with or work around the lack of plated through-holes, fine trace widths, solder mask, or other features that are hard to fab at home but easy at industrial scale.

>>1269699
Digital and analog power buses should be separated at some point and filtered individually. You can add filtering on the upstream power supply if you hear power supply noise.
>pic related
I don't believe so. The conections to pin 4 and pin 6, plus the bottom of one decoupling cap, should connect to one point which you call digital ground, and the other grounds plus the bottom of the other decoupling cap should connect to some other point which you call analog ground. Then those two points are connected together at the "global" ground. It doesn't look like you have separate +ve voltage supplies for that circuit so don't really have to worry about that. Pic related, only some analog ground connections shown bc the drawing got a little cramped