The purpose of this project is straightforward, I want to make a stereo audio amplifier that can integrate cleanly with a raspberry pi. The board complies with the Pi's foundations standard for a Pi hat and contains a DC-DC power supply, 25W audio amplifier and some audio conditioning circuitry. The board is being designed to only require a 24VDC external power input, which is used to power the amplifier and the Pi thanks to the board's step-down power supply. The board utilizes the Pi's pin interface to transmit power to the Pi and receive the Pi's audio signals. Since the Pi outputs a digital audio signal, the board has integrated some conditioning circuit that adds a buffer, does some lowpass filtering, and adds a DC line voltage, resulting in an analog signal suitable for the audio amp. Finally, the board implemented a Ti reference design that utilizes their TPA3123D2PWP stereo audio amplifier IC, and I made sure to use only audio-grade passive components for this step, cause me be fancy sometimes.

This is part of a larger project I am working on where I am building a stereo system for my bed, so I don't have to use my cellphone as my alarm clock. There is some coding stuff on the pi I will need to figure out, such as setting the alarm time from my phone or what music to play but the is all to be determined later. I will also design some speakers that fit my bed (got to be aesthetic, you know) and plan to do some acoustic simulations to figure out some speaker enclosure parameters (did someone say waveguides?).