| Layer | Type | Description | |-------|------|-------------| | Top | Signal + RF | Components, antenna, critical traces | | Bottom | Ground | Solid copper pour, grounding vias | | (If 4-layer) | Inner1 | GND plane | | (If 4-layer) | Inner2 | Power (3.3V, 1.8V) |

Includes an onboard LED that flashes quickly when searching for a connection and slowly (or stays solid) once paired. FCC Report Common Pinout & Wiring

The is a highly popular, low-cost Bluetooth audio receiver module board frequently used in DIY electronics, custom speaker builds, and retrofitting old audio gear . This printed circuit board (PCB) acts as a bridge, transforming traditional wired sound systems into modern, wireless stereo rigs.

Designed to run on 3.3V to 4.2V , making it compatible with standard lithium-polymer batteries. Common Applications User’s Manual - FCC Report

To eliminate the high-frequency switching hum associated with Bluetooth data packets, the board employs a . The digital ground plane (handling the SoC and power switching) connects to the analog ground plane (handling the DAC and audio paths) at a single star-ground point. Decoupling capacitors (

The "v2.pcb" designation typically refers to a revised layout that includes:

Provides stereo output (Left, Right, and Ground) often requiring an external amplifier to drive larger speakers, though it may drive small 3W-5W speakers directly in some configurations.

Smartphones, laptops, and home appliances all rely on custom-designed PCBs for their internal electronics.

WK LIFE BORN TO LIVE RB-M33 Rich Fabric Series Wireless Bluetooth Soundbar Speaker 10W (Black)

Bk-m33-bt-v2.pcb appears to be a PCB design filename that follows common naming conventions:

: While exact specs vary by variant, similar modules from Parts Express offer 2 x 40W amplification.

If an exact match is unavailable, here's a step-by-step approach to finding a suitable replacement.

I Made my own Audio Bluetooth module | Details - Hackaday.io

: Bluetooth 5.0 backward compatible with 4.2 / 4.0.

: Features Bluetooth 5.0 for wireless streaming, typically supporting a range of approximately 10–20 meters.

PCB files, like "Bk-m33-bt-v2.pcb", are typically associated with the design and layout of printed circuit boards. These files are created using specialized software such as KiCad, Eagle, or Altium Designer, which are popular tools for designing and laying out PCBs.