Bluetooth Speaker I built this speaker as a gift. This post is an overview of the design and construction process. Before I began construction, I created a model in Inventor. This allowed me to compare different designs and find the one I liked best. View of case interior after installing controls, drivers, and dampening material. Rear panel, showing amplifier board, battery pack, and buck/boost converter used for charging. Later revision. I added two boards (center and bottom) to prevent back-feeding the converter while charging, cut off the battery at low voltage, and allow the battery to be bypassed with wall power. I also added a battery level indicator. Front panel showing powered indicator lamps. Rear panel with cover. Updated rear panel