The circuit diagram for the JHS Angry Charlie V3 (1) is relatively simple largely based upon a single IC, the LM833 opamp, with a further opamp (TL072) providing voltage buffering. This was chosen as an introductory guitar pedal effect project, more for the learning exercise, but with the potential of producing a high-gain distortion/overdrive effect with a 3-band EQ section.
As mentioned in the "Effects Layouts" blog, the Angry Charlie is " ... pretty much the Crunch Box with a 3-band Baxandall tone stack".
The JHS Pedals site (2) describes the effect pedal as a "high-gain overdrive/distortion that has a British flavor" that:
- Turns any amp into a screaming Marshall stack
- Go from bluesy Hendrix-like breakup to high-gain Brit tones with a twist of the Drive knob
- Drive and Volume control interact the same as a master volume amp head
- Back off your guitar’s volume to control your gain levels without losing clarity
My experimenting with the "Angry Charlie" is detailed in the various following Sections, and uses my "home-brewed" version of the "Beavis Board" (3), which is a guitar effect pedal development and prototyping board. This approach makes testing/modding guitar effect pedal circuits much quicker while being less error prone and easier to debug.
The Photographs and Video Sections demonstrate my take on the "Angry Charlie" and the various circuit modifications/substitutions I demoed on the guitar effect pedal prototyping board, and various stages of the construction. Schematics and circuit details are also provided in the relevant sections.