Please buy some contact mics from me I am broke:
https://metalmarshmallow.com/product....

This is the preamp I use in the video:
https://metalmarshmallow.com/product....

Steve Mould's video:
   • Piezoelectricity - why hitting crysta...  

Collin's Lab (Make) video:
   • Collin's Lab: Homebrew Piezo  

0:00 Quartz Crystal Microphone
3:33 Growing Rochelle Salt Crystal
6:16 Rochelle Salt Crystal Microphone
8:04 Quartz vs Rochelle Salt Comparison
10:31 Best Recording with Rochelle Salt