Bring your wireless audio to life with SOUNDitBOX, a compact, high-quality Bluetooth A2DP audio receiver designed for audiophiles, hi-fi enthusiasts, and DIY makers alike. Powered by the versatile ESP32-WROOM-32E and paired with a Texas Instruments PCM1754 DAC, SOUNDitBOX delivers clean, detailed analog sound from any Bluetooth-enabled device directly into your vintage stereo, active speakers, or amplifier.

Power On: Press button for 1 second

Power Off: Press button for 3 seconds

✨ Key Features

Cable-Free Aesthetics: Built-in battery management lets you place the receiver anywhere on your desktop, shelf, or audio cabinet without dangling cables.

Dedicated TI PCM1754 DAC: Pure line-level 24-bit analog output engineered to feed AUX, CD, or RCA inputs on home amplifiers.

Integrated Hardware Battery Protection: Onboard Overvoltage (OVP), Undervoltage (UVP), and Short-Circuit/Overcurrent protection for safe battery charging and operation.

Dual Power Modes: Runs on a single 3.7V Li-Po battery OR directly via standard 5V USB-C power.

Smart Auto-Shutdown: Conserves battery life by automatically powering down during extended inactivity.

Instant Universal Pairing: Works out of the box with iOS, Android, macOS, Windows, and Linux via standard A2DP Bluetooth.

🔋 Power & Battery Options

To comply with international air shipping regulations, a battery is not pre-installed, but setup is zero-friction:

Option 1 (Plug & Play — No Battery): Simply plug any 5V USB-C cable into the board. It powers on and streams immediately.

Option 2 (Wireless Battery Operation): Plug in any standard 3.7V single-cell Li-Po / Li-Ion battery with a 1.25mm pitch 2-pin connector (Molex 51021-0200 / PicoBlade compatible). The onboard charger safely charges it at 500mA whenever USB-C is connected.

Sourcing a Battery

Search Amazon, AliExpress, or eBay using these exact terms:

3.7V LiPo battery 1.25mm Molex 51021

3.7V LiPo PicoBlade 1.25mm

⚠️ CRITICAL POLARITY CHECK:

Before plugging in your battery, verify that the Red wire (+) aligns with the [+] pad on the PCB, and the Black wire (-) aligns with the [-] pad. While the board features protection circuitry, reversing polarity on lithium batteries can damage components.

🛠️ Technical Specifications

Bluetooth Controller: ESP32-WROOM-32E (A2DP Stereo profile)

Audio DAC: Texas Instruments PCM1754 (24-bit / 96kHz capability)

Audio Output: Line-level analog stereo signal (3.5mm jack / output pads)

Power Input: USB-C (Resistor-coded 5V input)

Charge Circuit: Integrated 500mA Li-Ion/LiPo charger + BQ29700 protection IC