Yesterday, Ronaldo commented on the Power Brick post pleading for a voltage doubler using the 555 chip. Well, since it sounded like it was an emergency, here you go. ;) D1-2 should be barrier Schottky diodes and don't forget the jumper under the IC.
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.