Building your own Piezo-Preamp – The Center for Haptic Audio Interaction Research
A 5-channel mixer / preamplifier for piezo disks by Godfried-Willem Raes
Designing and building an active contact microphone for field recording and sound design — Ezra Gray Audio - Sound Engineer & Sound Artist in Dorset, UK
building contact microphones - john grzinich
contact microphone preamp buffer - MOD WIGGLER
SWM-25
Alex Rice Piezo Preamplifier – Zach Poff
LOM knowledge base: research:contact_mics
Simple Contact Microphone
Custom Contact Mic Preamps - Yann Seznec
Building (or Buying) Contact Mics – Zach Poff
Piezo contact microphone hi-Z amplifier – low noise version – Richard Mudhar
Piezo contact microphone hi-Z amplifier using a FET – Richard Mudhar
operational amplifier - What is a good circuit for recording a piezo contact microphone or an electric guitar pickup? - Electrical Engineering Stack Exchange
Piezo Element Amplifier for Guitar and Violin - Electronics-Lab.com
Make this DIY Contact MIC Circuit | Homemade Circuit Projects
Make this DIY Contact MIC Circuit | Homemade Circuit Projects
Piezo Preamps
Metal Marshmallow II Piezo Disc Contact Mic and Preamp - Etsy