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MEP EP#331: The PCB Plague

Podcast Notes

Neutrik EtherCON Ruggedized RJ45

  • Lockable RJ45 cable within an XLR style housing
  • Also come in a sealed version that offers IP65 rating

Interesting PCB failures

Effect of Moon Phase on Tombstoning

  • Many factors play a role in the overall outcome of PCB assembly, especially when very small components are involved. Broadly speaking, tombstoning is a problem with very small 2-pin components (0201 caps and such) and we’ve filtered out the following challenges:
  • – proper paste application
  • – component placement
  • – designing for “good” thermal properties of the PCB with regard to tombstoning
  • – moon phase

Stretching Stainless Stencils? Oddity Today

  • Interesting manufacturing defect surfacing
  • Stencil “stretches” ever couple panels or so
  • Anyone ever seen or experienced this before?
  • Solutions? Next Steps?

Project: SNACKEY

  • Hacking a USI/Vendnet/FSI 3159
  • Theory of how a snack machine works
  • Interesting Parts
    • UCN5890A
    • UCN5842A
    • SC529136CFN2
    • M48T18-100PC1
  • What I am doing to hack it
    • Motor control
      • High/Low side transistors
      • Might change this to mosfets to reduce voltage drop
    • Arduino all the things
    • Current sensing
      • INA219 High side sensing

Special thanks to whixr over at Tymkrs for the intro and outro!

About The Hosts

Parker Dillmann is MacroFab's Co-Founder, and Lead ECE with backgrounds in Embedded System Design, and Digital Signal Processing. He got his start in 2005 by hacking Nintendo consoles into portable gaming units. He also runs the blog, longhornengineer.com, where he posts his personal projects, technical guides, and appnotes about board layout design and components. Parker graduated with a BS in Electrical and Computer Engineering from the University of Texas.

Stephen Kraig began his electronics career by building musical oriented circuits in 2003. Stephen is an avid guitar player and, in his down time, manufactures audio electronics including guitar amplifiers, pedals, and pro audio gear. Stephen graduated with a BS in Electrical Engineering from Texas A&M University.

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