I am designing the layout of a PCB for audio applications (no digital electronics, only analog).
All components are through hole, the PCB is pretty large (about 16cm x 10cm) and has 2 layers. Plated through hole are supported by the technology I am using. The circuit has a dual supply.
Which (and why) of the following is the best solution for routing signals, power supply tracks and ground?
- TOP layer: ground plane; BOTTOM layer: signals and supply lines;
- TOP layer: signals and power supply lines: BOTTOM layer: ground plane;
- TOP layer: ground plane and supply lines; BOTTOM layer: signals;
- TOP layer: signals; BOTTOM layer: ground plane and supply lines;
Best Answer
I think all these other answers are over-complicating the issue. Through-hole designs are legitimate in many cases, and so are 2 layer boards.
I would recommend using a ground plane and a signal/power plane unless you have a reason not to. This design method is tried and true and I don't see any reason you shouldn't use it. I think it doesn't really matter which side you put the signals on.
You will need to make some jumpers in the ground plane, but this won't cause any problems if you avoid making large cuts. I made a quick and terrible image in paint to illustrate:
As Neil mentioned, your ground return paths do matter, you shouldn't just consider them finished when they enter the ground plane.