Marshmallow Contact Microphone with Preamp - YouTube
How to make your own Contact Mic (no solder) - YouTube
Easy, Durable Contact Mics How-To, with Sample Audio - CDM Create Digital Music
Designing and building an active contact microphone for field recording and sound design — Ezra Gray Audio - Sound Engineer & Sound Artist in Dorset, UK
Belt The Quarantine Blues Into A Homemade Mic | Hackaday
Not a lot of love in r/DIY for my Piezo Mics I made! : r/WeAreTheMusicMakers
Piezo contact mic - Phase57
Make a Contact Microphone : 10 Steps (with Pictures) - Instructables
Building A Contact Mic Using Homemade Piezo Crystals | Hackaday
Make this DIY Contact MIC Circuit - Homemade Circuit Projects