PCB Design Checklist for Electronic Engineers

• 1) Analyze the circuit to ensure smooth signal flow
• 2) Use short or isolated signal paths when necessary
• 3) Shield critical areas effectively
• 4) Utilize basic grid graphics
• 5) Optimize the PCB size
• 6) Maximize trace widths and spacing
• 7) Use preferred pad and hole sizes
• 8) Prepare PCB artwork and silkscreen appropriately
• 9) Minimize jumpers and avoid passing through components

Additional Inspection Items:

• 10) Ensure visibility and correctness of letters after assembly
• 11) Prevent copper foil blistering with appropriate windows
• 12) Include tool positioning holes

Electrical Characteristics Inspection:

• 1) Analyze wire resistance, inductance, and capacitance influences
• 2) Check wire accessory spacing for insulation requirements
• 3) Control insulation resistance in key areas
• 4) Fully identify polarity
• 5) Measure wire spacing impact on leakage resistance and voltage
• 6) Identify surface coating medium changes

Physical Characteristics Inspection:

• 1) Ensure pads and positions are suitable for assembly
• 2) Verify PCB can withstand shock and vibration
• 3) Determine spacing for standard components
• 4) Securely fix loose or heavy components
• 5) Correct heat dissipation and isolation
• 6) Position multi-lead components accurately
• 7) Eliminate potential interferences
• 8) Verify component arrangement and orientation
• 9) Check positioning hole sizes
• 10) Ensure comprehensive tolerances
• 11) Control physical properties of coatings
• 12) Maintain acceptable hole-to-lead wire ratios

Mechanical Design Factors:

PCBs provide mechanical support but should not be structural parts. Support every 5 inches on the PCB edge is recommended.

Installation Requirements:

Support should extend at least 1 inch from all edges. For different thicknesses, adjust support point distances for rigidity and resonance prevention.

Mounting Technologies Considerations:

• 1) PCB size and shape
• 2) Input and output terminals
• 3) Available equipment space
• 4) Loading and unloading ease
• 5) Attachment types
• 6) Heat dissipation needs
• 7) Shieldability requirements
• 8) Circuit interactions

Mounting Frames Requirements:

• 1) Ensure no component obstruction
• 2) Consider installation distances between PCBs
• 3) Design with appropriate mounting holes and slots
• 4) Account for plug-in tool sizes

PCB Assembly Tips for Plug-in Devices

• Attach plug-in devices securely to the PCB assembly using rivets.
• Design mounting frames with load-bearing flanges for PCBs.
• Ensure compatibility between plug-in tools and PCB size, shape, and thickness.
• Consider costs associated with plug-in tool usage, including tool price and additional expenses.
• Ensure sufficient equipment access for plug-in tool fastening and use.

When working on PCB assembly, it is crucial to follow these guidelines to ensure proper functioning and longevity of your electronic devices. By securely attaching plug-in devices and designing suitable mounting frames, you can enhance the performance and durability of your PCBs. Additionally, considering compatibility and costs associated with plug-in tools will help you make informed decisions during the assembly process. Remember to prioritize equipment access for efficient fastening and use of plug-in tools.