Here is the list of all articles on the site.
DIY Pedal Builds
Building a simple pedal (LPB-1)
Building a simple MOSFET based boost pedal (AMZ Mosfet Booster)
Building a simple JFET based boost pedal (based on Fetzer Valve)
Building a simple Op Amp based boost pedal (Thunder – my own design similar to MXR Micro Amp)
Building a simple fuzz (Silicon Fuzz Face clone)
Some basic techniques, anything useful really for building pedals yourself.
Simple guide on how to convert circuit from using a NPN transistors to PNP transistors (NPN to PNP)