Cortado" Balanced Piezo Contact Mic kit now available from Zeppelin Design Labs | diyAudio
Designing and building an active contact microphone for field recording and sound design — Ezra Gray Audio - Sound Engineer & Sound Artist in Dorset, UK
Make a Contact Microphone : 10 Steps (with Pictures) - Instructables
Sigil Transducer - DIY Contact Mic Kit | CCTV
LOM knowledge base: research:contact_mics
building contact microphones - john grzinich
Building (or Buying) Contact Mics – Zach Poff
How to make your own Contact Mic (no solder) - YouTube