This is a quality buffer with on-board 3PDT switch. It can be added to any circuit with ease.
The dimensions of the pcb are 38x30mm.
This project is by GuitarPCB.com, in cooperation with Musikding. For any technical problem relating to building this project, please contact Barry at GuitarPCB.com forum.
You get full technical support at the GuitarPCB.com forum, membership is free of course! There is even more detailed build information available there:
Here is the direct link to the building docs, including layout and schematic: