“Muff Opportunity” (Big Muff Pi™ – Opamp clone) PCB

Rated 5.00 out of 5 based on 1 customer rating
(1 customer review)


A clone of the Big Muff Pi™ opamp versions which were released around 1978-1980.  This circuit is often attributed to the “sound” of the Smashing Pumpkins.  Check out the BUILD DOC for more info! 


In stock (can be backordered)



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!

Demo Video:

1 review for “Muff Opportunity” (Big Muff Pi™ – Opamp clone) PCB

  1. Rated 5 out of 5

    Cory Davis (verified owner)

    Just finished this build and it is sooooo much fun. Super thick and aggressive full up, but calms down with the guitar volume backed off a bit. Way more versatile than I thought it would be. Very happy!! A pretty easy build to boot!

Add a review

Your email address will not be published. Required fields are marked *