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Building with the Soekris dam1121
Building with the Soekris dam1121
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Old 26th May 2016, 10:16 AM   #21
jaffar is offline jaffar  Russian Federation
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Quote:
Originally Posted by TNT View Post
Took delivery of 2 pcs. Small board - now wait for the rest of the needed stuff.
Please share your impressions when everything is ready (esp. dam1021 comparisons).

Thanks.
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Old 26th May 2016, 04:10 PM   #22
schmike is offline schmike  Hong Kong
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Just received and open box.
Surprise.
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Old 26th May 2016, 10:22 PM   #23
soekris is offline soekris  Denmark
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Quote:
Originally Posted by schmike View Post
Just received and open box.
Surprise.
The problem is ? I actually had to reverse that power protection diode as the contract manufacturer made a mistake on the first batch.

The first board there might be a piece of solder left, just take a small brush and remove it. Anything else just looks like a little flux residue, don't do any harm.
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Old 26th May 2016, 11:50 PM   #24
schmike is offline schmike  Hong Kong
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Quote:
Originally Posted by soekris View Post
The problem is ? I actually had to reverse that power protection diode as the contract manufacturer made a mistake on the first batch.

The first board there might be a piece of solder left, just take a small brush and remove it. Anything else just looks like a little flux residue, don't do any harm.
The second one have scratch on PCB case by retouch.
I don't know why the factory accept the the pcb have scratch have retouch.

And the QA accept the piece of solder left on the PCBA.
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Old 26th May 2016, 11:51 PM   #25
schmike is offline schmike  Hong Kong
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can Søren provide more detial about the Vref?
Thanks
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Old 26th May 2016, 11:58 PM   #26
soekris is offline soekris  Denmark
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Quote:
Originally Posted by schmike View Post
The second one have scratch on PCB case by retouch.
I don't know why the factory accept the the pcb have scratch have retouch.
I can't see any problem with the PCB.... And they're all fully electrical tested anyway. Or at least specified to be, you never know with these far east PCB manufacturers....

Quote:
And the QA accept the piece of solder left on the PCBA.
Maybe because the rework QA (In this case me....) missed it ??
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Old 27th May 2016, 07:54 PM   #27
TNT is offline TNT  Sweden
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Sören - as I understand it this board introduce re-clocking (U8/U11?) after the FPGA. You should have moved the clock close to the re-clocking flip-flops - 8mm traces and make the long traces back to the FPGA etc.

//
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Old 27th May 2016, 07:59 PM   #28
soekris is offline soekris  Denmark
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Quote:
Originally Posted by TNT View Post
Sören - as I understand it this board introduce re-clocking (U8/U11?) after the FPGA. You should have moved the clock close to the re-clocking flip-flops - 8mm traces and make the long traces back to the FPGA etc.

//
Eeeh, LVDS signaling with controlled impedance traces and termination.... Trust me, clocking is optimal.
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Old 27th May 2016, 09:03 PM   #29
TNT is offline TNT  Sweden
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Hmmmnnnjjjjvvsss....

OK, I do

Still, a short optimized path is better than a longer optimized path - or?

//

Last edited by TNT; 27th May 2016 at 09:21 PM.
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Old 27th May 2016, 10:43 PM   #30
TNT is offline TNT  Sweden
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Sören, can we hope for a potentiometer way of controlling level?

//
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