2025

I designed a compact, high-performance audio processing PCB for a modular speaker system, built around an ADAU1701 DSP and a TPA3118 Class-D amplifier. The board features USB-C and 3.5 mm AUX input, along with a 3.5 mm AUX output for stereo daisy-chaining. A rear selector switch allows each speaker to be configured as Left, Right, or Mono, enabling simple, lag-free multi-speaker setups.

I developed custom DSP firmware in SigmaStudio implementing digital signal processing techniques including active crossovers, dynamic EQ, time alignment, source select, volume control, and driver protection. This processing helps deliver ±3 dB frequency response from 43 Hz to 20 kHz at 75 dB SPL using a compact 4-inch woofer and silk-dome tweeter.

The design includes an ESP32 expansion header with I²S audio input, enabling optional wireless features such as Bluetooth and AirPlay via open-source software like Squeezelite.

*these are photographs, not renders*