Being unsatisfied with the sound of most octave fuzzes I tried/listened to I decided to cook something up myself.
This is really nothing new, but just a 2+2=5.
I took the rectifier circuit from Gus Smalley's Octave Up Sick Box. (which is just an opamp version of the transistor version seen in a lot of the octavers). I fixed the gain to about 4.7x. And removed the diode clippers. I fed the output of this via a big muff style sustain control into a bog standard gain maxed out fuzz face topology. The biggest difference comes with the 33n cap to ground from the non inverting input of the first opamp stage. This mimics the tone knob rolled back on the axe. This cap is on the same switch as the diode lift to keep treble when the octave is off. (when it is on the octave produces a lot of extra high end). Furthermore I have a resistor across one of the diodes in the rectifier (the one that is switched) to keep some bottom end when the octave is engaged. This resistor is still subject. to tweaking.
Anyways, it is a GOOD sounding fuzz and a VERY GOOD sounding octave. I hope anyone will try it.
I've attached the schematic and a vero layout. (unverified, but checked)
(ps. yes on the vero I switch the other diode in/out as compared with the schematic. This was easier for layout purposes and does not matter soundwise)
https://dl.dropboxusercontent.com/u/184 ... es/dpf.pdf
https://dl.dropboxusercontent.com/u/184 ... schemo.png
https://dl.dropboxusercontent.com/u/184 ... es/dpf.sch
Wiring looks a bit messy ::)
Enjoy!
Arnoud
