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.

Monday, June 1, 2015

JHS Superbolt

Here's a popular JHS pedal that emulates old Supro/Valco amps: the Superbolt. It has a remarkable similarity to the Run Off Groove Supreaux and Supreaux Deux. It seems to be a slightly modded Supreaux, with the high/low switch and 18 volt supply of the Supreaux Deux. A charge pump is also added so the pedal can run off a typical 9v supply. You can use an ICL7660 or MAX1044 in place of the LT1054 (though, if you use the MAX1044, be sure to ground pin 5). This one's laid out for on board pots as well as the SPDT switch. Be sure to bias the JFETs to around 9v, then adjust to taste.


  1. You can tag this! Works and sounds pretty good. Just an advice: tune the trimpots by ear, using the recomended voltages it sounded like crap!

  2. Can you give me layout file? I have only SOT-23 J201 (MMBFJ201)