MI Audio - Crunch Box

Only joking; here's the real MI Audio Crunch Box:

And here's an internal shot:

The MI Audio Crunch Box is a high gain distortion BeAsT! MI Audio make some great pedals and this is one of their most popular designs. It's schematic has been out on the DIY scene for a while but I still get the odd request for it so I thought I'd upload a project for you....

Here's the MI Audio website description of the Crunch Box (I know - it's an image!):

And the ProGuitarShop video of the Crunch Box in action:

Any how, onto the goods. There are two versions of the Crunch Box schematic a V1 schematic from an early model and a V2 schematic from a later model. Here they both are:

As you can see there are a few changes and the V2 circuit has the internal presence control that is mentioned in the MI Audio description. You could say that the Crunch Box is based on the Marshall Guv'nor without the 3 band tonestack (As is similar with the Lovepedal Superlead):

Here's a vero layout and a tagboard layout for the Crunch Box:

(Thanks to Sinner of http://www.turretboard.org for this one!)

Here's a PCB Layout for the Crunch Box: http://www.box.com/s/0xii4uivpp2nxbx1pkzl

Here's the freestompboxes.org forum topic for reference: http://freestompboxes.org/viewtopic.php?f=7&t=221