MEP EP#331: The PCB Plague

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

• “The Plague”
• Black Pad
• Very poor to no solderability

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