Quack Machine - Dr Quack Auto Envelope Filter

New PCB for 2018

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.

The Range control can be preset with an internal trimmer, or go for the extra fun of an external pot.

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 only available with full kits, and will not take a battery. Knobs are not included.

Difficulty: Medium

PCB size: 50 x 38mm

Knobs required: 1

Enclosure: 1590B



Pedal Parts



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Customer Reviews

2 review(s) posted (write review)
Awesome pedal, after sensitivity adjustment 4 product stars
"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 - 30/03/2014
Great Pedal 5 product stars
"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 - 09/07/2013

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Full kits DO NOT include enclosures unless you select them in the 'Kit Type' drop-down menu.

Don't forget to download the appropriate daughterboard build document for your kit:
Standard 3PDT