This is Madbean’s version of the famous Univibe pedal.
I’ve added a “Multi-Vibe Mod” to it.
You can find all infos on this circuit or buy one of his PCBs here:
http://www.madbeanpedals.com/projects/index.html
09/11/2016 Layout Updated! Changed the charge pump daughter board.
There’s also a different but verified layout by Savvas in the Forum section.