HoloAmp

First test with optical cube

Electronics Block Diagram

First Signs of Life

Clock Generator Debugging

Overview:
The HoloAmp is my current ongoing project and it’s is a stereo audio amplifier with real-time frequency visualization. It combines analog audio design, embedded digital signal processing, optical projection, and custom enclosure development. I started this project to expand my electrical and software engineering skills while building something functional for my stereo system.

Skills & Tools:
Circuit design and debugging, embedded DSP programming (C/C++), I2S/SPI communication protocols, analog audio design, CAD design (SolidWorks), 3D printing, breadboard prototyping, oscilloscope debugging, power distribution architecture, system integration, FFT algorithm implementation, component selection and specification

System Architecture

The system splits an incoming audio signal into two parallel paths: one for amplification to drive passive speakers, and another for digitization and real-time frequency analysis. Audio data is processed on a Teensy microcontroller and rendered on a TFT display, then optically projected through a glass cube to create a pseudo-holographic floating effect using the Pepper's Ghost principle.

Enclosure Development

Now that the electronics are mostly ready, I am currently working on the enclosure in my free time (SolidWorks). It will be a low-profile enclosure with the glass cube slightly inset into the front face as the primary visual element. The enclosure will feature a volume knob, interface buttons for changing visualization modes and colors, and ventilation features for the Class-D amplifier. The first prototype will be 3D printed in PLA, with potential future iterations in sheet metal depending on the final form factor and thermal requirements.

Graphics Testing