This project was originally posted over at FreeStompboxes,org. This is a great sounding Tone Bender. Easy to build, and parts are not hard to find. I haven’t tried it but it would probably work with a range of other transistors.
I designed tis PCB and made it available through PCBWay.com on their shared service. You can order boards for yourself from their shared service here:
Here is my drawing of the schematic for reference.
Download the drilling guide here.
Print the guide at 100% and wrap it around your enclosure with a piece of tape. This guide is meant to fit a 1590B sized enclosure.