Smartphones turned music into just another notification competing for attention, a song interrupted by a text, an album broken up by a calendar alert. RHYTHM exists to undo that arrangement entirely, building a dedicated listening device from real audio components instead of borrowing a phone’s guts and bolting on a headphone jack. It’s a from-scratch digital audio player designed around one job: playing music properly, without a screen demanding anything else from you.
That commitment starts with what’s actually driving the sound. Rather than leaning on an all-in-one audio codec chip the way most budget players do, RHYTHM routes music through a genuine ESS SABRE DAC, the same category of chip found in dedicated hi-fi gear, paired with a discrete amplifier stage rather than a shortcut solution. An ESP32-S3 handles the file parsing and processing, but the actual sound reproduction runs through hardware built specifically for that job alone.
Designer: Mithilesh Gupta Konda
The headphone output makes the clearest case for why any of this matters. Instead of splitting one internal signal across a single jack, RHYTHM runs two completely independent, actively buffered 3.5mm outputs, each driven by its own dedicated amplifier chip. Two people can plug in two entirely different pairs of headphones, and each gets a full, uncompromised signal, no shared circuit quietly degrading whichever connection came second.
Keeping that signal clean required rethinking the power supply as much as the audio path. RHYTHM physically separates its digital logic and high-frequency switching lines from the analog circuitry that actually shapes the sound, regulating each side through its own dedicated, ultra-low-noise power regulator. It’s an unglamorous decision that never shows up in a spec sheet screenshot, but it’s exactly the kind of choice that determines whether quiet passages in a recording stay quiet.
Physical control gets the same attention. A precision mechanical rotary encoder handles navigation alongside a set of tactile buttons, giving the whole interface a hands-on quality that a touchscreen simply can’t replicate. Paired with a compact 2-inch color display, the device reads less like a shrunken phone and more like a purpose-built instrument, something meant to be operated by feel in a pocket or a bag without needing to look at it.
A microSD slot rounds out the practical side, storing lossless files locally rather than depending on a streaming connection or app ecosystem. That local-first approach extends the project’s entire philosophy: RHYTHM isn’t trying to replace a phone’s convenience. Instead, it’s opting out of that convenience on purpose, trading constant connectivity for a listening experience built around a single, uninterrupted task.
