KX Reference PCB shared order ; who is interested?

[zhtoor]

the dammed thing was modulating the laser output with those input current injection noise spikes, which then showed up on the optics.  Oops.  Learned an expensive lesson on that one.  Since then we've been very wary on where they are used.

interesting "dimples" on the interferogram 

[zhtoor]

The next thing to study is observe how they get 28 bits resolution from a 12 bit ADC 

maybe we should ask kleinstien to do a spice model for that one!

regards.

[voltampere]

....
E) if you really are afraid using LTC2057 then you could also use a LT1006 (= half 1013). (See cirquit on page 1 of the LTZ1000 datasheet).
....

That should be the easiest compromise for the beginning!

Thank you...

Joerg

[SvanGool]

For the statistics:

• I got reported today that there are more than 69 KX V3 reference boards already purchased from OSH Park
• There were already more than 40 KX V1 reference boards around from the group buy by mimmus78

Congratulations TiN, you have got more than 100 KX boards circling around, we might see some real LTZ1000 traction in the coming months, what a motivating initiative you started !       

[TiN]

Crazy, I wish we would ever see data at least of 20% of that... 

[voltampere]

I promise to share my data.

But first i need to build the KX-REF. ( and bring my meters into a trusting condition... )

I have some questions regarding the fabrication of the board.

allpcb.com is asking for details that i cannot give....


So far i chose :

Layers : 4
Thickness : 1.6 ( other options 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 2.0, 2.4, 3.0 )
Solder Mask : red
Silkscreen : white
Surface Finish : Immersion Gold


Now the rest that i can only guess :

Min spacing : 5/5 mil ; 6/6 mil ( 6/6 is the default )
Min Hole Size : 0.25 mm ; 0.3 mm ( 0.3 is default ; do we need smaller Holes ? )
Immersion Gold thickness : 1u" ; 2u" ( 1u" is default ; is that u" a micro-inch, a thousandth of an inch ? )
Golden Finger Beveling : yes ; no ( *Both sides bevelling with 35°?Same treatment with chosen Surface Finish )
Via Process : Tenting Vias ; Vias not covered ; plugged vias ( Tenting vias is default )
Finished Copper : 1oz ; 2oz ( 1oz is default )


I would appreciate some help here...

Thank you very much


Joerg

[TiN]

Min spacing : 6/6 mil ( 6/6 is the default ) is OK.
Min Hole Size : 0.3mm will be ok.
Immersion Gold thickness : 1u" is OK.
Golden Finger Beveling : No need, there is no edge connector.
Via Process : Tent all via.
Finished Copper : 1oz finish.

You should try blue or white soldermask. So we can have all color variants of KX'es running around  .

[Muxr]

I've built my KX reference with some janky resistors for now.. she's burning in, while I wait for real resistors to arrive. Will share my findings as well.

[voltampere]

Min spacing : 6/6 mil ( 6/6 is the default ) is OK.
Min Hole Size : 0.3mm will be ok.
Immersion Gold thickness : 1u" is OK.
Golden Finger Beveling : No need, there is no edge connector.
Via Process : Tent all via.
Finished Copper : 1oz finish.

You should try blue or white soldermask. So we can have all color variants of KX'es running around  .

Thank you ...

So its pretty much default all the way....


Soldermask will be blue then....

Joerg

[hwj-d]

Soldermask will be blue then....

yesss...
don't like this white ones 

[voltampere]

I received the boards from allpcb.com.

They are not perfect, but as far as i see it ( i am not experienced ) they should work.

Compared to the pictures from TIN´s website the silkscreen has a slight "offset".

I ordered a couple more boards than i need.
If you are interested please send me a PM.

Regards Joerg



EDIT:
I just found out that i posted two pics of the backside of the board, now attached a pic of the frontside as well.

[hwj-d]

Nice boards. 

[TiN]

Looking good to me. Silkscreen is not on the pads, so who cares
Watch out on thin double trace to pin 3, make sure it's not open.

[voltampere]

Looking good to me. Silkscreen is not on the pads, so who cares
Watch out on thin double trace to pin 3, make sure it's not open.

I am not too worried about the silkscreen.
Just wondering if it is their standard "quality" of if it is because of some file conversion trouble.
They could not use the drill file of your Gerber archive without making some manual "adjustments".
So maybe the silkscreen is also "adjusted" in some way?

Thank you for ypur advice on the thin trace.
I will check when i´m back home on saturday.

Is it this one?

Regards

Joerg

[TiN]

Yes. Looks ok though on the photo.