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STC

Inside High End Equipment

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2 minutes ago, STC said:

Look carefully and you see the traces of the old module. Same DAC one is DIP and another is SOIC. One is small, one is large. In the the left channel was soldered to the bottom of the PCB. The DIP was soldered next to each other because it couldn’t fit in. in this case, it was replacing the faulty DAC with DIP module. 

Why not use a SOIC replacement?

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3 minutes ago, STC said:

They are not reliable. 

And the DIP version is? Are they not simply different packages with the same die inside?

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2 minutes ago, mansr said:

And the DIP version is? Are they not simply different packages with the same die inside?


Ask them why one is failing more often than the another. 

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5 minutes ago, STC said:


Ask them why one is failing more often than the another. 

It could be interesting to compare the surface temperature of both packages.


How a Digital Audio file sounds, or a Digital Video file looks, is governed to a large extent by the Power Supply area. All that Identical Checksums gives is the possibility of REGENERATING the file to close to that of the original file.

 

PROFILE UPDATED 18-06-2019

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6 minutes ago, sandyk said:

It could be interesting to compare the surface temperature of both packages.

 

That was brilliant. You are right about overheating. Not sure if that was the module's fault or design's fault. DIP was the older design though. 

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21 minutes ago, STC said:

 

That was brilliant. You are right about overheating. Not sure if that was the module's fault or design's fault. DIP was the older design though. 

 The larger DIP packages would have longer traces to the pins, as well the I.C.  pins themselves being much larger and perhaps reducing the internal heating slightly.

With the LM4562 series for example, the designers reported hearing an improvement with the HA (metal can) version, despite their A.P. Test equipment not revealing any differences in measurements.


How a Digital Audio file sounds, or a Digital Video file looks, is governed to a large extent by the Power Supply area. All that Identical Checksums gives is the possibility of REGENERATING the file to close to that of the original file.

 

PROFILE UPDATED 18-06-2019

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4 hours ago, sandyk said:

 The larger DIP packages would have longer traces to the pins, as well the I.C.  pins themselves being much larger and perhaps reducing the internal heating slightly.

With the LM4562 series for example, the designers reported hearing an improvement with the HA (metal can) version, despite their A.P. Test equipment not revealing any differences in measurements.


I told my friend to take the temperature. But he thinks the problem is related to something else which is too complicated for me to understand. 
 

Acoustic Transmission  measurements at ears should reveal them them. 

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Ok. I think time for to bring this thread to an end as not many new brands are coming. My friend is no longer taking in heavy equipment since it is difficult for him to carry them to the workbench. So don’t expect Zanden, Krell reference or a D’Agostino. 
 

Posting some of the many brands that I have 1)Marantz DV7001 SACD/DVD, 2) Audio Innovations Harmonie amp 3) California Audio Labs Sigma II DAC 

 

 

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