This is the first octaver for gaussmarkov.net. If you have a steady soldering hand, or are seeking a challenge, this is a good one: a Pearl OC-07 clone. I used SMD ICs and a two-board arrangement to get everything (except a battery ) into a Hammond 1590B. My build is pictured above; you can see the daughter board standing vertically at the bottom of the enclosure.
Because I laid everything out in Eagle it seemed natural to make everything available on gaussmarkov.net. Check out my website if you would like to see my small tube amp projects. And see my original posts on Aron’s diystompboxes forum: search for posts by zeta55 with the word “pearl” in them. You can find more discussion and some sound clips there.