[time-nuts] Ublox 8T

[Bob kb8tq]

Hi

I’ve looked at several “you supply the components” outfits. Each time I’ve dug into it,
the mechanics of supplying an adequate number of parts has been pretty daunting. 
None of the things I do is very “high volume” ( 10 is a lot of boards for me ). 

Bob

> On Dec 10, 2020, at 9:21 AM, Mark Goldberg <marklgoldberg at gmail.com> wrote:
> 
> If you have some volume, consider Small Batch Assembly:
> 
> https://www.smallbatchassembly.com/
> 
> They are not as cheap as the Chinese suppliers, but you can provide
> your own components, and it is run by a very helpful gentleman in the
> Washington DC area. I got the bare boards from OshPark and you can
> order your components from distributors and send them directly to
> Small Batch. I preferred using my own parts from known sources, but
> they have a stock of components also.
> 
> Regards,
> 
> Mark
> 
> On Thu, Dec 10, 2020 at 6:43 AM Bob kb8tq <kb8tq at n1k.org> wrote:
>> 
>> Hi
>> 
>> If you have a board with many dozens of passive parts on it and
>> four or five IC’s getting all those passives down on the board *is*
>> very useful. Their price on typical passive parts is low enough that
>> the delivered cost is still very close to a bare board.
>> 
>> If you do use odd IC’s you have to move quick. Get the board(s) laid
>> out and into them fast. Accept that you may not be in stock next week.
>> For things like three terminal regulators or run of the mill digital stuff, they
>> seem to maintain a pretty good inventory. Yes, it will be in “their” favorite
>> package ….
>> 
>> Bob
>> 
>>> On Dec 10, 2020, at 2:48 AM, Matthias Welwarsky <time-nuts at welwarsky.de> wrote:
>>> 
>>> On Mittwoch, 9. Dezember 2020 23:58:51 CET Bob kb8tq wrote:
>>>> One note: JLPCB is the only “fab + assembly” outfit I’ve tried. Their boards
>>>> are no better / no worse than a lot of other board fab outfits. I have no
>>>> idea how they compare to other assembly houses. My selection criteria: “
>>>> are they the cheapest I can find?”
>>> 
>>> Currently, you will not find any other fab+assembly service that is as cheap
>>> and requiring (almost) no human intervention. For protoype runs with two to
>>> five boards assembled there is no competition. I'd say even for 50 boards
>>> there isn't.
>>> 
>>> The JLCPCB PCBs are ok, the biggest letdown is the solder mask. It's just
>>> plain bad. It flakes off on the tiniest rub with a hot iron.
>>> 
>>> The biggest obstacle for sure is the limited parts catalog. They have a decent
>>> assortment of passives but almost all active parts come from the "extended"
>>> listing (extra cost, 10 uniques only) and they may not stock the footprint you
>>> want to use, and the wildly fluctuating inventory.
>>> 
>>> I'm treating them mainly as a layer of convenience. I let them place all the
>>> boring passives and maybe a few common actives, but I don't go out of my way
>>> to design along their catalog only, knowing that they might not have stock of
>>> all the parts anyway when I order the boards.
>>> 
>>> 
>>> 
>>> 
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>> 
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