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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Old 13th July 2018, 08:34 PM   #7441
alec_eiffel is offline alec_eiffel  France
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WARNING : if there is suspicion your DAC is deficient, and if you try the unbeffered output, check that there is no DC before pluging the amp.
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Old 13th July 2018, 09:42 PM   #7442
randytsuch is offline randytsuch
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I would take a long hard look at the shift registers for the left output, and compare them to the right output shift registers.
If you probe around, pretty sure you will find a difference.
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Old 14th July 2018, 11:26 AM   #7443
Faboz is offline Faboz  France
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Ok thanks I'll check vcc tomorrow and let you know.
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Old 15th July 2018, 01:53 PM   #7444
Faboz is offline Faboz  France
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Quote:
Originally Posted by randytsuch View Post
I would take a long hard look at the shift registers for the left output, and compare them to the right output shift registers.
If you probe around, pretty sure you will find a difference.
Hello Randytsuch,

I probed the shift registers, here are the values for VCC
First row: 4.02V
2nd row: -4.02V
3rd row: 4.02V
4th row: -0.11V which is left channel

So You were right, something is wrong with the board, I checked with a Lense to see if something obvious could be seen, but i didnt find anything. I’ll contact Soekris service department for an repair/exchange.

Nothing else to do right?

Faboz
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Old 16th July 2018, 04:07 PM   #7445
randytsuch is offline randytsuch
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Quote:
Originally Posted by Faboz View Post
Hello Randytsuch,

I probed the shift registers, here are the values for VCC
First row: 4.02V
2nd row: -4.02V
3rd row: 4.02V
4th row: -0.11V which is left channel

So You were right, something is wrong with the board, I checked with a Lense to see if something obvious could be seen, but i didnt find anything. I’ll contact Soekris service department for an repair/exchange.

Nothing else to do right?

Faboz
I would definitely call them, and see what you can work out since sure seems like the board is defective. I would guess Vcc to the forth row of SRs is open, so you are not really getting a voltage there.
Could be an open via somewhere, I've seen that happen on PWBs, and they may work when brand new, but fail after a little while if the via had a problem to begin with.

BTW, power to the 2nd and 4th rows are actually -4V goes to the ground pins and ground goes to the Vcc pins. So the SRs see +4V for their Vcc, but they are actually at -4V relative to ground.

Randy
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Old 16th July 2018, 06:11 PM   #7446
Faboz is offline Faboz  France
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The board is going back to Soekris for repair. I'll keep posted.
Thanks
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Old 16th July 2018, 06:34 PM   #7447
TNT is offline TNT  Sweden
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Fantastic weather in Scandinavia so prepare that it will take a while

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Old 16th July 2018, 08:25 PM   #7448
derekr is offline derekr  Barbados
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Fantastic weather in Scandinavia so prepare that it will take a while

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I trust you are sailing then!

Søren must be tanned by now....
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Old 16th July 2018, 08:42 PM   #7449
sbobba is offline sbobba  Italy
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Send a message via AIM to sbobba Send a message via MSN to sbobba Send a message via Yahoo to sbobba
I've been waiting for a month already
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Old 16th July 2018, 09:38 PM   #7450
TNT is offline TNT  Sweden
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Søren must be tanned by now....
:-D

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