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Easy, Durable Contact Mics How-To, with Sample Audio - CDM Create Digital Music
Contact Mics Contact Microphones Piezoelectronic Transducers Piezo Microphones Weirdo Gadgets Designed by Crank Sturgeon Manufactured by Huso Solutions since 2007
Piezo contact mic - Phase57
Marshmallow Contact Microphone with Preamp - YouTube
Not a lot of love in r/DIY for my Piezo Mics I made! : r/WeAreTheMusicMakers