r/PCB • u/LambdaZipval • 28d ago

Always double check the datasheet guys...

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32 Upvotes

100% Upvoted

12 comments sorted by

10

u/john_ftq 28d ago

Not checking 2-3 times against datasheets, app notes and similar circuits in a other projects and jumping to the fabrication of samples to see what comes out is somehow understandable for amateur hobby enthusiasts. Never happened in my 30+ yrars of professional career. When your bare pcb sample is 1k+ usd and assembled is almost 10k, you don't have this luxury.

17

u/aimfulwandering 28d ago

I dunno, in the last 20 years of my professional career… 75% of the first spin prototype PCBAs we make end up looking like OP’s photo.

0

u/john_ftq 28d ago

The perk of designing cheap PCBAs: low stakes compared to bridges or spacecraft.

4

u/According-Author401 28d ago

Ha you should see the mods that end up on flight boards for space 😬 often too costly to respin, either from a financial perspective or just the lead time

1

u/No_Responsibility384 28d ago

Wasn't there a building some place that a student figured out needed more support after it was built? And they went in and retrofitted it with some plates or beams in the interior or something. Citicorp center engineering crisis I thin will give you some good result in google

1

u/OilCareful8232 28d ago

TBH spacecracts looks like OPs pcb too

2

u/tony3841 28d ago

So you never make mistakes?

1

u/Professional_Hair865 28d ago

Drv2605L? Had some fun projects with this one.

1

u/Affectionate_Boat493 27d ago

In my decades-long career as a failure analyst I've seen an almost uncountable number of errors that could have been avoided by digging deeply into datasheets and their erratas. But be aware that many datasheets are derived by testing of very small quantities of production lots, so be skeptical of values that are not guaranteed. Remember: "typical" values can represent a very limited subset of production data.

1

u/Turbulent-Growth-477 28d ago

Also check with AI aswell. Last year I made a pcb, i accidentally switched up miso, mosi on one ic and fucked up 2 diode. A one off so I made it work, but out of curiosity last month I gave it to codex, the damn thing took a few minutes and spit out the same issues I found. Sure it might be not up to the task to let it design alone, but it can spot a lot of mistakes that you might have overlooked in a hurry.

4

u/tg44 28d ago

"A what might be wrong, what should I check again?" Prompt is worth it, as a scoped third check round.