And the original version. You can supply this with 18V if you want the extra headroom, but if you are likely to do that make sure you choose appropriately rated caps. Xotic’s info:
What do the tones of renowned guitarist such as Page, EVH and Johnson have in common? They all used the legendary echo machine EP-3 as a pre-amp. We’ve captured that magic in a new Xotic Effects pedal, the EP Booster.
We’ve used the highest quality parts available with a discrete FET design and low impedance output, the EP Booster provides up to +20dB of unadulterated boost with multi-dimensional, shimmering highs and lows, and no ear fatigue. The internal DIP switches let you choose the boost frequencies, and EQ settings.
Update: I noticed I had a cut in between the JFET drain and the 8K2 resistor which shouldn’t be there. If you’ve already made this then make a solder bridge over that cut and it should work, or if you want to build it use the updated layout below
