Make a Contact Microphone : 10 Steps (with Pictures) - Instructables
Building (or Buying) Contact Mics – Zach Poff
Contact Mics Contact Microphones Piezoelectronic Transducers Piezo Microphones Weirdo Gadgets Designed by Crank Sturgeon Manufactured by Huso Solutions since 2007
Not a lot of love in r/DIY for my Piezo Mics I made! : r/WeAreTheMusicMakers
LOM knowledge base: research:contact_mics
Piezo contact mic - Phase57
How to Build a Contact MIC Circuit
Make this DIY Contact MIC Circuit - Homemade Circuit Projects
LOM knowledge base: research:contact_mics
Zeppelin Design Labs Cortado MkII Contact Mic DIY Kit