MEP EP#331: The PCB Plague

MacroFab Engineering Podcast

English - June 03, 2022 21:38 - 59 minutes - 82.3 MB - ★★★★★ - 34 ratings
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Previous Episode: MEP EP#330: Rogue Gerbers - Jerry McDaniel of Customer Care at MacroFab

Next Episode: MEP EP#332: This Podcast Intentionally Left Blank

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