Dr. Quack (EHX™ Doctor Q™)

Dr. Quack is a improved design of the EH™ Doctor Q™ filter from the AMZ site. The Geofex site offers a layout for this great little effect circuit.

Note that neither the schematic nor the layout lists the unit values of the capacitors. The capacitor values are in microfarads.

This project is another take on an improved Electro-Harmonix™ Dr. Q™ Filter from the home-wrecker.com site and the schematic is here. Thanks to Dean Hazelwanter for the PCB design.