The Angry Carlos has been inspired on pedals such as JHS’s Angry Charlie and M-Audio’s Crunch Box as one of the best Marshall in a box.
This pedal comes ready to be wired as True Bypass and has a compact design that fits a 1590b enclosure. Its versatility allows the building of different versions of this classic drive. Comes with the diode toggle selector on board.
For further analysis on M-audio Crunch Box´s circuit, take a look at this thread on Free Stomp Boxes Forum.