Hi -

Yes... no point burning money and time on paste masks and assembly company if the boards are unworkable for some reason. (And there's plenty of ways to get things wrong, although I took a lot of care it's a lot all at once from zero.) Obviously for production a pick-and-place line would do them, for practical, aesthetic, and reliability reasons.

The only items I know are challenging soldering-wise are the hdmi connectors, other connectors might be problematic with inaccessible smt pads (didn't get a chance to physically see them yet) but there can be workarounds for that. The rest of the soldering is just 'normal'.

-Andy

David Long <dave.long@linaro.org> wrote:
On 12/18/12 23:04, Andy Green wrote:
On 13/12/12 18:05, the mail apparently from Andy Green included:
On 07/12/12 11:59, the mail apparently from Andy Green included:
On 05/12/12 13:51, the mail apparently from Andy Green included:
Hi -

Here's a draft specification for some small, cheap hardware devices
would be useful in Lava to solve many interesting test scenarios that
can't be done without some small hardware assist.

I have some time to prototype these devices and scenario boards in the
next couple of weeks, but before starting I would like to get feedback
on the specification, particularly anything dumb ^^ or other
interesting
tests that are not mentioned that are compatible with the basic
approach
and could be piled on if thought about from the start.

Also, what is the status of the SD Mux thing currently? If it's
moribund I can look at that too; if not, great.

After offlist feedback here's v0.2, changelog

- SD Mux

- mounting considerations

- clarify multi connector set boards only have one connector set
fitted on a given board and set the SCEN bus accordingly

I have now completed laying out four PCBs, you can find updated docs and
the schematics / PCB layouts here

https://wiki.linaro.org/People/AndyGreen/Lava-lmp

... any feedback appreciated.

Update on status...

- I changed the micro SD header to a 70mm custom flat cable

- that and 2 x the four PCBs are being fabricated in Taiwan and
should be with me next week

- I updated the wiki link above with the gerbers and drill data used
for these prototype boards

- All the parts needed are in stock at Farnell / Newark / Element 14
and were ordered last week: they should also be with me next week.

So you're doing the PCB assembly yourself?

-dl