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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 l.jpg

Printed Circuit BoardAnarchy DriveBy

ITP - November 13, 2006

Nick Sears – http://jamesnsears.com

Michael Ang – http://michaelang.com


What we re going to do l.jpg
What we’re going to do

  • Comparison of prototyping techniques

  • Designing a board

    • Schematic capture

    • Board layout


What we re going to do contd l.jpg
What we’re going to do (contd)

  • Making a board

    • Output file generation

    • Online fabricators

    • DIY

  • Resources and links

  • Surface-mount soldering demo



Breadboard l.jpg
Breadboard

  • Fast!

  • Susceptible to vibration, dropping

  • Can document with good photo

  • Easy to debug


Breadboard6 l.jpg
Breadboard

  • Being neat is worth it!

    (don’t do this)


Protoboard l.jpg
Protoboard

  • Cheap!

  • Slower than breadboard

  • Hard to capture layout

  • Good reliability

  • Thought required while assembling


Circuit board l.jpg
Circuit board

  • More startup cost/time

  • Good debugging

  • Easy to make more boards

  • Good reliability

  • Good for communicating design

  • Smallest!


Design steps l.jpg
Design Steps

  • Schematic capture

  • Board layout


Schematic capture l.jpg
Schematic capture

  • Add parts

  • Connect parts (create “nets”)

  • Create new devices (if necessary)

  • Electrical Rule Check (ERC)


Board design l.jpg
Board Design

  • Create board from schematic

  • Place components

  • Route traces

  • Design Rule Check (DRC)


Common sizes l.jpg
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 l.jpg
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 l.jpg
Generate Output Files

  • Generate Gerber files

  • Generate layer images


Sample pricing l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
Next Steps

  • Design a board

  • Get it fabricated

  • Make a nice enclosure

  • Have your projects travel the world

  • Sleep soundly at night


Resources l.jpg
Resources

  • Blog post will be updated: http://www.michaelang.com/a/102/printed-circuit-boards-driveby.html


Questions l.jpg

Questions?

Nick Sears – http://jamesnsears.com

Michael Ang – http://michaelang.com

(Stick around and watch Nick solder!)


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