[Arm-netbook] Arm Netbook, Saw the update,

[Luke Kenneth Casson Leighton]

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Thu, Jul 20, 2017 at 10:35 PM, Richard Wilbur
<richard.wilbur at gmail.com> wrote:
> On Thu, Jul 20, 2017 at 10:07 AM, Luke Kenneth Casson Leighton
> <lkcl at lkcl.net> wrote:
>> On Tue, Jun 27, 2017 at 4:56 AM, Richard Wilbur
>> <richard.wilbur at gmail.com> wrote:
>>
>>> In the interest of solving the challenge of integrating the HDMI connector, I have a few questions:
> [...]
>>> 2.  How many copper layers does this board have?
>>
>>  6
>
> Okay, that didn't change since the last time you answered this.  (You
> just answered the more complete version of my reply sent back on 27
> Jun.  I accidentally sent it before I finished writing it--and then
> sent the complete version after I finished writing it.  You replied in
> June to the incomplete version of the message and today to the
> complete version.  Sorry for causing any confusion as I am still
> making peace with the user interface of my smart phone E-mail
> client--which I'm thankfully not using right now.)

 i had a pre-prepared response which i'd not sent.  saw the questions,
answered them, hit send... then realised i'd seen them before :)

>>> 3.  What is the minimum trace size?
>>
>>  5mil
>>
>>> 4.  What is the minimum trace spacing?
>>
>>  5mil.
>
> Did you change pcb fabricators recently?

 no.

>  In June you said the minimum
> trace size and spacing were 3.5mil.

 yep that's another board.

>  Just want to be sure I'm working
> with the right numbers.

 5mil.

>>> 5.  Is the minimum plated through hole diameter 6 mil?
>>
>>  yes.  with a 12mil surround.
>>
> [...]
>>> The Amphenol part has 0.15mm clearance between lands for even row of pins and board edge in cutout while Molex 468753011 has 0.9mm clearance in the same spot.
>>
>>  i'll be using the JAE DC3 because the pins are exposed, meaning that
>> standard oven baking can be used.  the amphenol part the pins are
>> covered over, meaning that a second pass of solder reflow is needed.
>> that costs money... and sometimes doesn't work anyway.
>
> Sounds like an improvement in manufacturability.  Which part are you using?
> These are all mid-mount micro-HDMI receptacles.

 correct.

> DC3R019JA7R1500  0.65mm                 0.65

 this one lines up with the micro-hdmi and usb-otg connector.

l.