LND150 SRPP OD

[mdc]

I've been futzing with this pleasant-sounding overdrive over the past couple weeks, and finally built it up into a working pedal.
It's based on RG Keen's example of an SRPP circuit which is in turned derived from Jack Orman's mu-amp/mini booster. It uses LND150 depletion MOSFETs and the gain is controlled by an emitter follower in reverse-beta. It's rounded out with a SWTC2.

Certainly not reinventing the wheel or anything, but it sounds pretty cool imo.

Schem:

Vero:

 

[Grubb]

Beautiful! I too am messing with mu-amps atm. They're fun. I'm currently re-working the EQ section of a Vertex design and also fiddling around with a BSIAB2/Wampler Pinnacle-type thing. Your drive circuit looks like a fun build. I'm glad to see the Gain knob is the big boy