Department - Author 1

Electrical Engineering Department

Degree Name - Author 1

BS in Electrical Engineering



Primary Advisor

Jeff Gerfen


This project was proposed by a startup company from downtown San Luis Obispo called BaseRock. BaseRock sells a backpack containing subwoofers to allow the user to feel low frequencies of music. It is intended for concerts or personal use, listening to songs on an MP3. The main way the BaseRock backpack communicates with MP3s is via the headphone jack. With the introduction of the Apple iPhone 7 in September of 2016, BaseRock realized it was at a disadvantage. Millions of iPhone 7 owners and potential customers around the globe would no longer possess a headphone jack. BaseRock needs a Bluetooth-to-headphone jack adapter for its product to be competitive in the post iPhone 7 market. The module described by this report is able to pair to both an MP3 and to Bluetooth headphones. The device takes music data from the phone/MP3, passes it to the backpack subwoofers, and also to user headphones. Design challenges include compact size, internal power, and simultaneous signal outputs.