Made from spare parts from an old Ibanez. This guy named Scotty has a nice tutorial on how to build one. Although, his contact mic is a bit complex. All you need is a buzzer (Piezo Transducer) from RadioShack part #273-073a and a female 1/4 audio jack (phone jack). Here’s the link: http://www.cigarboxguitars.com/workshops/Piezo_Transducer.php
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