This PCB allows you to build a modified Voodoo Lab® Overdrive. Modifications include the addition of a tone control, different clipping diodes, and a couple of other part value changes. This puts it in line with a few other commercially-available modified clones out there.
This project also includes a voltage doubler so you can run it at 18 volts with a standard 9V supply. This has the effect of being tighter with more clarity and most people prefer it with the higher voltage. It also includes a switch to change the response of the tone control as well as a clipping diode switch.