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Printed Circuit Board Anarchy DriveBy ITP - November 13, 2006 Nick Sears – http://jamesnsears.com Michael Ang – http://michaelang.com What we’re going to do Comparison of prototyping techniques Designing a board Schematic capture Board layout What we’re going to do (contd)

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printed circuit board anarchy driveby

Printed Circuit BoardAnarchy DriveBy

ITP - November 13, 2006

Nick Sears – http://jamesnsears.com

Michael Ang – http://michaelang.com

what we re going to do
What we’re going to do
  • Comparison of prototyping techniques
  • Designing a board
    • Schematic capture
    • Board layout
what we re going to do contd
What we’re going to do (contd)
  • Making a board
    • Output file generation
    • Online fabricators
    • DIY
  • Resources and links
  • Surface-mount soldering demo
breadboard
Breadboard
  • Fast!
  • Susceptible to vibration, dropping
  • Can document with good photo
  • Easy to debug
breadboard6
Breadboard
  • Being neat is worth it!

(don’t do this)

protoboard
Protoboard
  • Cheap!
  • Slower than breadboard
  • Hard to capture layout
  • Good reliability
  • Thought required while assembling
circuit board
Circuit board
  • More startup cost/time
  • Good debugging
  • Easy to make more boards
  • Good reliability
  • Good for communicating design
  • Smallest!
design steps
Design Steps
  • Schematic capture
  • Board layout
schematic capture
Schematic capture
  • Add parts
  • Connect parts (create “nets”)
  • Create new devices (if necessary)
  • Electrical Rule Check (ERC)
board design
Board Design
  • Create board from schematic
  • Place components
  • Route traces
  • Design Rule Check (DRC)
common sizes
Common sizes
  • Check with board house for available drill sizes and trace widths
    • Some provide DRC file for Eagle
  • Holes
    • Vias - 20 mils (or smallest from board house)
    • Holes - ~50 mils
  • Traces
    • 10 mils (larger for power and where possible)
board layers
Board Layers
  • Top – top traces and SMT pads
  • Bottom – bottom traces and SMT pads
  • Pads – through-hole component legs
  • Vias – connect top and bottom signals
  • Dimension – outline of board
  • tPlace, (bPlace) – silkscreen
  • tStop, bStop – soldermask
  • (And a few more layers, e.g. for autorouter)
generate output files
Generate Output Files
  • Generate Gerber files
  • Generate layer images
sample pricing
Sample Pricing
  • Most do boards up to a given size, or full panel
  • Can put multiple designs or copies on a single board/panel
    • Fabricator charges to score or cut
  • Group orders a good idea
sample pricing contd
Sample Pricing (contd)
  • http://batchpcb.com
    • $10 + $2.50/sq in (cheapest for small boards)
    • Wait while orders are batched
    • Shipping included (n weeks, where n=??)
  • http://goldphoenixpcb.biz
    • $120 for 14.5x10” panel
    • Shipping included (~1 week)
    • Depanelize??
sample pricing contd17
Sample Pricing (contd)
  • http://custompcb.com
    • 2x 4x5.5” for $58
    • $12 shipping
    • De-panelize for $.50/piece
  • Advanced Circuits (http://www.33each.com/)
    • $33 for 60 sq in (min 1 with student special)
    • Not sure about shipping
diy board etching
DIY Board Etching
  • ITP Board Etching Tutorial(thanks Todd!)
  • Use laser printer to print top and bottom layers
  • Transfer toner to copper clad board
  • Etch away excess copper using FeCl
    • Put in Hazmat when done!!!!
  • Drill holes
next steps
Next Steps
  • Design a board
  • Get it fabricated
  • Make a nice enclosure
  • Have your projects travel the world
  • Sleep soundly at night
resources
Resources
  • Blog post will be updated: http://www.michaelang.com/a/102/printed-circuit-boards-driveby.html
questions

Questions?

Nick Sears – http://jamesnsears.com

Michael Ang – http://michaelang.com

(Stick around and watch Nick solder!)