DIY Contact Mic - Collin's Lab

It's amazing what a little disk can do ... when it's layered with piezoelectric crystals. Piezo disks are impressively sensitive to vibration and can easily be adapted to work as a contact microphones. The trick is the preamp - a basic circuit used to match the piezo's signal to levels compatible with modern audio gear inputs. The resulting piezo/preamp combo can be used for electrifying an acoustic guitar or simply exploring the lesser-heard world of small sound around us.
Find more at the Maker Shed: https://makershed.com
Make: Electronics, 3rd Edition: https://www.makershed.com/products/ma...

Learn more here:
http://makezine.com/video/diy-contact...