Building Breadboard PCB Layouts in KiCad

As part of the investigation of "good-enough" microphone preamplifiers, I wanted to create a breadboard-style PCB that could be used for various prototypes. 

I wanted a board that would carry a variety of audio connectors, have some provision for power and space for a couple of audio transformers and relays to cover different forms to input coupling and the possibility of controlling phantom power, winding configurations or earthing arrangements.

There is more about the process of designing such a PCB in KiCad in the video below:

The source file for the design can be found here. The front and rear of the PCB can be seen below.