Quack Machine - Dr Quack Auto Envelope Filter

From the vendor

Automatically funkerise your playing with this ingenius circuit. The filter responds to your playing dynamics, giving an auto-wah effect that gets stronger the harder you play. Based on the original Dr Q auto filter, but with the added Dr Quack improvements by Jack Orman. Danelectro packaged the same circuit up as the French Fries. The Range control can be preset with an internal trimmer, or go for the extra fun of an external pot. The kit is supplied with vertical-mount pots which have round shafts, so you'll need set-screw fitting knobs. If you want the PCB without parts there's a link for that at the bottom of the page. Partial kit: PCB, all board-mounted components, pots. Full kit: As above, plus footswitch and appropriate daughterboard/components for your selected bypass type (see Downloads section for details of those), jack sockets, DC socket, battery snap, hook-up wire, LED. Enclosure (pre-drilled) is available as an option with full kits, and will not take a battery. Knobs are not included. Inspired by: Doctor Quack / French Fries PCB size: 50 x 38mm Knobs required: 1 Enclosure: 1590B Download the INSTRUCTION PDF