Quack Machine - Dr Quack Auto Envelope Filter

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

Product Code: QuackMachine

Brand: Pedal Parts

Weight: 80.0g

Product Condition: New

Kit type* Range pot?*

£26.40 inc. tax

£22.00 ex. tax

? Tax based on United Kingdom.

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Customer Reviews

2 review(s) posted (write review)

Awesome pedal, after sensitivity adjustment
"Built the pedal but had difficulty getting the sensitivity within a useful range. After much fiddling with R6 without any usable results, I halved R5 which pushed the sensitivity way up. I'm no electronics expert, but it works and hasn't exploded yet, so I'm happy. Also the 3d printed rubber duck knobs add a nice touch. P.S. - there is no good reason not to have D2 mounted to the case to see the Quack level, so do it." Vince - 30 March 2014

Great Pedal
"I've just finished my Quack Machine and it sounds great. After fixing a couple of mistakes this pedal was making all the sounds I hoped it would and is definitely going on my pedal board. This isn't too difficult to build and initially took me just over three hours, although it took a little bit longer to realize that I'd damaged the traces a little on the PCB (entirely due to my own heavy handedness), and so didn't get my pedal working straight away. The parts quality is great and the instructions are straightforward and most importantly the tone is excellent, very similar to the EH DR Q but better! This is the second Poodle pedal I've built, now just gonna figure out which one to get next..." Joe Sullivan - 09 July 2013