The Muff Opportunity is a clone of Big Muff Pi™ opamp version which was released by Electro Harmonix around 1978-1980. This fuzz uses [opamps instead of transistors to create a unique fuzz sound. Billy Corgan of the band Smashing Pumpkins is known for using these types of muffs to create the sonic textures of “Siamese Dream” and many others albums/songs.
The PCB is designed to fit into a 1590B enclosure and uses standard 16mm pots. This is a fairly easy build, and you are rewarded with some great sounds for your efforts!
Check out the BUILD DOC for more info!