Mechanical and Front-Panel Constraints
Purpose
Capture the industrial design and packaging constraints that will drive the schematic partitioning and PCB layout.
Overall Product Direction
- Retro tabletop radio character
- Wood-cabinet visual language
- Approximate overall width target: 220 mm
- Front-facing user interaction
- Small center display instead of analog band scale
Enclosure Intent
The enclosure should communicate:
- Warmth
- Furniture-like presence
- Simplicity
- Longevity
The wood look may be achieved through:
- Real wood panels
- Veneer
- Wood-look composite or polymer surfaces
Primary Front-Panel Elements
- Left knob
- Center display
- Right knob
These elements should define the visual hierarchy of the product.
Front-Panel Layout Constraints
Width
- Overall product width target is approximately 220 mm
Symmetry
- The two knobs should appear balanced around the center display
- Small visual offsets are acceptable if needed for internal packaging or speaker placement
Display Placement
- Display should be centered or near-centered on the front face
- Display opening and bezel should remain visually modest to preserve the retro aesthetic
Knob Placement
- Knobs should be comfortably reachable without crowding the display
- Spacing should support a premium tactile feel
- Shaft/encoder mounting must tolerate repeated user interaction
Internal Packaging Constraints
The internal volume must accommodate:
- Main PCB or multiple PCBs
- Speakers
- Rechargeable battery
- Charging/power hardware
- Cabling and mounting hardware
- Wireless antenna keep-out considerations
PCB Implications
Board Strategy
Candidate strategies:
- One main horizontal PCB with front-panel mounted controls and display
- Mainboard plus smaller front-panel daughterboard
Front-Panel Alignment Needs
The PCB architecture must support precise alignment for:
- Knob shafts or encoder stems
- Display window position
- Mounting bosses/standoffs
RF Constraints
Because the enclosure is wood-like rather than fully metallic, wireless performance may be favorable, but the PCB still needs:
- Controlled antenna placement
- Clearance from battery, speaker magnets, and large conductive structures
Audio/Acoustic Constraints
The mechanical design should reserve space for:
- Speaker cavity/volume
- Acoustic vents or grille strategy
- Isolation from rattles and cabinet buzz
Power and Battery Constraints
- Battery must be mounted safely and serviceably
- Charging connector location should be easy to access
- Thermal behavior during charging and playback must be considered
- Internal routing should minimize risk of pinched battery wires
User Interaction Constraints
- Knob torque and feel should match premium radio expectations
- Display viewing angle should suit tabletop use
- Button/knob feedback should remain usable while the unit is plugged in or battery-powered
Service and Assembly Considerations
The product should be designed so that:
- PCB installation is straightforward
- Speaker and battery connections are accessible during assembly
- Front-panel alignment can be repeated reliably
- The display window and knob openings are manufacturable with consistent tolerances
Preliminary Dimensional Guidance
These are concept-level constraints only and require later refinement:
- Product width: about 220 mm
- Display should remain small relative to the front panel
- Knobs should be visually dominant but not oversized
- Internal battery volume must not compromise speaker placement or antenna performance
Open Mechanical Decisions
- Final enclosure height and depth
- Mono versus stereo speaker layout
- Grille placement and material approach
- Rear-panel connector arrangement
- Battery size and placement
- Whether the display sits behind smoked acrylic, glass, or open bezel
- Whether the front panel is flat, recessed, or slightly curved