DIY Bluetooth Mini Amplifier with TDA1517P

If you are interested in DIY Bluetooth mini power amplifiers, you might want to take a look at this article.

If you happen to have an optical transceiver with a compact and sturdy enclosure, and also have two Bluetooth headset boards and several pieces of TDA1517P, you can suddenly get an idea and reuse them to build a Bluetooth mini power amplifier.

First, you can draw the PCB according to the original circuit board dimensions, and apply a full ground copper pour on the bottom layer to help improve chip heat dissipation.

The circuit is very simple: a TDA1517P power amplifier circuit powered by 12V DC. The headset board is designed for a 4.2V lithium battery, so you use a 7805 voltage regulator, and a B0505S isolation module with a series diode at the output to step down the voltage and supply power to the Bluetooth board.

You connect the Bluetooth indicator light and buttons to the PCB using flying wires, while the power supply and audio signals are connected through pin headers.

On the back side, you can conveniently install a four-position terminal block.

Front view.

The Bluetooth antenna is positioned right next to the enclosure’s heat dissipation grille. After assembly and testing, the Bluetooth signal transmission distance reaches about 15 meters without any issues.

Completed.