How to build a contact mic inducer/transducer (without hum)

This instructable will show you how I built a low noise contact microphone for my friend's double bass. The microphone can also be used as a transducer i.e. work in reverse to play back audio. This is inspired by Nicolas Collins Hack of the Month Club -- Project #6: Drivers & Transducers . Please ch...

By: simon.w.nordberg



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