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You'd better make sure you can get every component on the BOM before you go down this path. I have some connectors for a Damien board I've ordered last month that are shipping in April 馃が

Some stuff has a year of leadtime and no inventory anywhere on the planet. Find each part is the long pole in your tent right now, imo.
 

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...and it's likely the components could have as much as a two year leadtime. Without even one key component, you have nothing.

Make your project dependent on a $6 part with a 2 year delivery time and it will wind up as salvage in the classifieds.

This is not something to dismiss. Have all of the parts in hand before you fabricate any board these days. Here's an update I got from a supplier on parts for one of my projects from this past Sunday, if you don't believe me:
Font Screenshot Technology Parallel Document
 

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"Right now" is the important caveat in that statement.

Design your schematic, board layout, send it to PCB fab...then find zero stock.

The whole methodology has been turned in its head to where it doesn't go on the schematic unless it's ordered. Which is fine for a handful of devices and boards.

Then you go back, redesign the schematic and firmware to use your '841.

Then you go back, redesign the schematic and firmware to use the next one that's in stock.

A documentation, support, and revision control nightmare.
 
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