This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Wednesday, October 5, 2016

Mad Professor Little Green Wonder

I feel like in the past few months I've done a ton Tube Screamer variants. Well here's another one, but one of the more interesting ones I've seen. Bjorn designed this one for Mad Professor and utilizes a dual-gang pot for the Body control that affects both the treble and bass response. The IC was originally a LF353, but that was changed to the TLC272CP as it was more readily available and worked at lower voltages and breaks up easier. The only schematic I found online was a little difficult to read (it was hand drawn) so I've drawn that up in Eagle as well. Pots are board mounted and will fit nicely in a 1590B.


  1. Even a Martian would say that you are a real gift for the whole galaxy !

  2. Excellent!!! Waiting CMATMods Signa Drive, please) yesterday made a CMAT Mods Butah, I have pleasure from its effect) This is the best site, thank you for your work !!!

  3. Verified. In the meantime i use 1458 for the IC while waiting for the 272. Sound's very good how much more when 272 comes.

  4. What is the role of these two 3mm green LEDs?

  5. Just want to add a little info for future builder of this pedal. It also works using J201. I replace 20k dualgang pot for Focus knob with two mono 20ks, this gives me more option on the tone. The best TS9-based OD to my ear. Together with Crancked AC, it's a killer combination!

  6. Built this pedal. the 47ohm resistor inline with the power diode heated and smoked out after 15 mins of playing. It has very much gain on low gain settings, and much fuzzy/buzzy with lost signal on hign. Pcb is correct, i cant find any mistake, all soldering also perfect.. Can help?

    1. What kind of power supply are you running?