here's a new wah I designed and built recently.
it uses a Whipple inductor (although other inductors should work reasonably well
).P3 and P2 on the layout refer to the potentiometer terminals (P1 is connected to ground
)MPSA42 was chosen for low hfe - a 2N3904 will work well here too
.I used 2M7 resistors in this build instead of the 2M2 specified on the overlay picture - not a big difference - they are only there as fet biasing
.The wah shell was purchased from Smallbear electronics a few years ago.
Basically - the design is a standard wah wah with jfet buffered input and output BUT with true bypass.
The footswitch is wired so that the input to the wah input buffer is grounded when the effect is bypassed - this ensures low noise switching characteristics.
Enough talk - the drawings are 600dpi
cheers
bajaman
for the input one actually...
Ken
