Turbine speaker with passive radiator

thingiverse

Hello everyone! I've been eager to build a Bluetooth speaker for quite some time now. It needs to be small but sound great, and it should also look fantastic. I considered using a turbine design, which led me to create the passive radiator. The speaker can be no bigger than 80mm in diameter and 37mm deep. For the membrane on the radiator, I used a piece of 0.5mm thick latex. It's secured by a ring and six screws. The ring and the disc in the middle are glued together with super glue. Inside the body, there are holes for cutting threads in the plastic, measuring 2.5mm. The base features a 6mm hole for the power cable. The amplifier I'm using is available on eBay at this link: https://www.ebay.de/itm/Digitale-Verstarkerplatine-Bluetooth-Audio-Receiver-DC-5V-fur-Lautsprecher/253228181312?hash=item3af5936740:g:iMcAAOSwFyhZ8lT6. I deliberately avoided using a built-in battery to give users more freedom. For example, they could use a power bank or even connect their own mobile phone battery via OTG. A second version with a built-in battery might still be developed, but for now, I'm happy with this design.