highlighted in purple gets put into parallel with the cap highlighted in red with the toggle
switch is to the right (position 3). Try a 220n or .22uf cap here.
3. Make the 51pf feedback cap larger. Try a 220pf or 330pf.
18 volt operation? -
This can be a little tricky. Because the standard spec overdrive
circuit can run just fine at 18v. But the standard silicon boost circuit cannot. 18v will not
hurt it, but it will be distorted. The MOSFET boost can run at 18v. But the MOSFET
overdrive circuit cannot. Anymore than 9v will fry the MOSFET op amp. So if you want
to run the pedal at 18v, you'd need to build the overdrive portion of the circuit to standard
specs and build the boost to MOSFET specs.
