The 70s and 80s saw an explosion of pedals, especially distortion pedals, hitting the market. One of these was the Maxon / Ibanez SD-9 Sonic Distortion pedal. The circuit itself has quite a bit in common with the Boss DS-1 or MXR Distortion+. For this project I used the AionFX Meteor board - which like the Plasma board I recently built - is available in legacy (no bypass board) and new formats. I went with the most recent version of the board with the 3PDT bypass daughterboard. As with many classic pedals, this one doesn't appear to be in production anymore, though you can get used models for around $200.
