DIY Looper / Feedback pedal

Super simple circuit from www.beavisaudio.com/techpages/PedalHacker/index.htm

Waterslide transfer, spray paint, car varnish

 

Red momentary switch is 'max feedback', black is a kill switch.

 

You connect this pedal to other pedals, and it makes them freak out.

 

Default setting is 'really high pitched squeal', but 'impending high pitched squeal' is also possible, along with 'detuned short wave radio'.

Done