Make this DIY Contact MIC Circuit | Homemade Circuit Projects
RDL EZ-MPA2 MICROPHONE PREAMPLIFIER 2x XLR in, 2x RCA phono output, with compressor, AC adapter
Piezo contact microphone hi-Z amplifier – low noise version – Richard Mudhar
contact microphone preamp buffer - MOD WIGGLER
A Fascination with Noise: Contact Mics, Everyday Objects, and Product Design
Alctron RD501 tragbare multifunktions professionelle single channel mic preamp desktop mic verstärker für studio, bühne leistung|Professionelle Audio-Aufnahme| - AliExpress
Piezo Preamps
Stream Piezo Contact Mic Preamp Demonstration by Jay Brockman | Listen online for free on SoundCloud
Make this DIY Contact MIC Circuit | Homemade Circuit Projects
Building your own Piezo-Preamp – The Center for Haptic Audio Interaction Research
Collin's Lab: DIY Contact Mic - Make:
Marshmallow Contact Microphone with Preamp - YouTube