In an effort to make my own personal pedal board better, I'm building buffers at the input and output of my signal chain. As space and DC jacks are always a premium, I thought to build a dual buffer in a 1590A enclosure. The Klon Buffer is great and since it only uses half of a TL072, I figured I could just use the other half for the second buffer. It's a little tight depending on the jacks you use, but the board is small enough to mount vertically to an inside wall of a 1590A while the wall opposite can mount the 4 input/output jacks. Here's my drilling template to better illustrate.
This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.