• Deliver a complete schematic integrating wireless compute, audio output, display, user controls, and rechargeable battery management
• Fit the electrical architecture within a product concept targeting 220 mm overall width and a single main PCB envelope of roughly 140 mm to 170 mm by 45 mm to 70 mm
• Support WiFi and Bluetooth streaming-ready operation with a rechargeable battery option for a few hours of unplugged use
• Preserve front-panel industrial design intent: two knobs, small centered display, restrained speaker fields, hidden antenna treatment
• Establish a practical PCB baseline including board shape, mounting, placement zones, and RF/power/audio constraints

• Final acoustic tuning of speaker enclosure and passive radiator strategy
• Final industrial CMF release data, tooling details, and production DFM for enclosure plastics/wood veneer
• Full firmware implementation beyond architecture and hardware support requirements
• Final battery pack industrial safety certification package

Diagram

• The product shall present a retro-inspired tabletop radio appearance with a wood-look cabinet and a calm symmetrical front composition
• The product shall target an overall enclosure width of approximately 220 mm
• The product shall include two front-panel knobs as the primary user controls
• The product shall include a small center digital display in place of an analog band scale
• The product shall support WiFi connectivity for streaming-ready operation
• The product shall support Bluetooth connectivity for streaming-ready operation
• The product shall support rechargeable battery-backed operation for a few hours unplugged runtime
• The product shall support external powered operation while charging the battery
• The product shall display source, playback, connectivity, and battery information to the user

• Use an ESP32-S3 module architecture to simplify WiFi/Bluetooth implementation and native USB support
• Use a single-cell rechargeable Li-ion battery architecture with charge management and system power-path support
• Provide a regulated 3.3 V digital rail for MCU, display, and logic
• Provide an audio power path suitable for a compact Class-D speaker amplifier
• Include one pair of I2C pull-ups if an I2C display or peripheral bus is used
• Include per-IC local decoupling, with 100 nF ceramic decoupling at each IC power input and additional bulk capacitance as needed
• Provide USB-C sink configuration resistors on CC pins for 5 V input operation

• The architecture shall avoid exposed antennas and minimize RF performance degradation from nearby metal, battery, and speaker structures
• The design shall consider thermal buildup inside a partially enclosed wood-look cabinet
• The product shall support typical indoor tabletop consumer use

• Product width target: 220 mm
• Product height target: 125 mm nominal
• Product depth target: 95 mm nominal
• Main PCB target envelope: 140 mm to 170 mm wide and 45 mm to 70 mm tall
• Display visible window baseline: 62 mm x 22 mm
• Knob diameter baseline: 32 mm
• Reserve front left and right cavity regions for speakers and knob mechanics
• Maintain a non-metallic keepout region around the wireless antenna area

• Battery must coexist safely with audio amplifier, charger, and wireless electronics
• Charger architecture should support status indication and battery protection-oriented UX
• Power architecture should support charge-and-play rather than battery disconnect during plugged operation
• High dissipation parts must be kept away from battery and RF-sensitive regions where practical

• Use a 4-layer PCB baseline for RF, audio return control, and simplified power distribution
• Place the ESP32-S3 module at a board edge with antenna keepout on all copper layers
• Keep audio power paths separated from noisy digital and charging regions
• Keep display and knob support aligned with the front-panel mechanical envelope
• Keep mounting holes at corners and preserve mechanical clearances around them

• Prefer module-based RF implementation to reduce development risk
• Prefer commonly available library parts and generic passives where appropriate
• Use a charger with power-path management instead of a simpler charge-only part, because the product is intended to operate while charging

• A single-cell Li-ion battery is assumed as the rechargeable energy source
• A compact I2S Class-D amplifier is assumed for the first-pass audio output path
• The first-pass display is assumed to be a small SPI or I2C module centered on the front panel
• Firmware will implement knob push/long-press interaction states so additional front-panel buttons can be minimized
• Acoustic tuning, speaker choice, and exact battery capacity remain open and will refine PCB and enclosure details later

• Schematic includes complete wireless, power, battery, display, user-control, and audio subsystems
• PCB layout shape and mounting align with the enclosure-driven dimensions and front-panel concept
• Wireless module placement preserves antenna keepout and avoids obvious mechanical conflicts
• Battery charging and system-power behavior support operation while externally powered
• Audio path is suitable for streaming playback and routed with mixed-signal layout discipline

• Industrial design constraints are reflected in placement and connector decisions
• Battery runtime assumptions are documented and traceable to the power architecture
• Major subsystem interfaces are documented and consistent across requirements, architecture, and PCB planning
• Design can transition into detailed prototyping without reworking the core system partitioning

• Primary reference docs: master-industrial-design-brief, system-requirements, power-architecture, audio-architecture, firmware-architecture, pcb-mechanical-envelope