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Old 9th January 2013, 11:11 PM   #331
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Lazy Cat View Post
All VSSA parts got their positions on the PCB in the first phase, their optimal values will be fully investigated in the second phase of the testing. Feedback resistors values will likely be elevated to 2,2k/100R or something in between, depends on lower roll-off target. Power dissipation of certain resistor can be increased simply by paralleling/stacking them on top of each other. Specific Vishay SMD resistor case can handle 1W by default and can be increased to 5W as explained, if needed at all.
Most SMD types need space of copper connected to the pins (in the same way as power mosfets and transistors) to get rid of the heat. So stacking will only increase the heat handle a little.
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Old 18th January 2013, 08:34 AM   #332
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VSSA PCBs just arrived
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Old 18th January 2013, 11:19 AM   #333
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VSSA PCBs just arrived

Busy weekend is coming...
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Old 18th January 2013, 01:21 PM   #334
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Indeed
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Old 18th January 2013, 01:30 PM   #335
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Hi LC,

not in mind to put you pressure on but i think some people are waiting on result....Waht is the cost of some little puppie pcb????

Marc
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Old 18th January 2013, 01:41 PM   #336
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I don't know if that kind of interest really exists

I expect the results will be better than in prototyping phase. Will do most of the job over the weekend.

Regards L.C.
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Old 18th January 2013, 01:45 PM   #337
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VSSA PCB measures exactly 50 x 60 x 2 mm and can give 100 W/4 ohm. I think few € is a reasonable price.
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Old 18th January 2013, 01:49 PM   #338
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Originally Posted by Lazy Cat View Post
I don't know if that kind of interest really exists
May we have comparative listening impression with your SSA ? I know you are very good in this discipline :-)
I'm especially interested to get some inputs about any differences in signature between power lateral MOSFETs and BJTs.
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Old 18th January 2013, 01:51 PM   #339
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Originally Posted by Lazy Cat View Post
I don't know if that kind of interest really exists

I expect the results will be better than in prototyping phase. Will do most of the job over the weekend.

Regards L.C.
If result satisfy you i think to take 12 u (7u me et 5u a friend)

Marc
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Old 19th January 2013, 08:37 PM   #340
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How cool is this guys?

One VSSA channel done, one more to go.
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File Type: jpg VSSA PCB 4.jpg (620.1 KB, 1555 views)
File Type: jpg VSSA PCB 5.jpg (480.2 KB, 1413 views)
File Type: jpg VSSA PCB 7.jpg (919.3 KB, 1142 views)
File Type: jpg VSSA PCB 8.jpg (418.6 KB, 939 views)
File Type: jpg VSSA PCB 9.jpg (392.3 KB, 693 views)
File Type: jpg VSSA PCB 10.jpg (360.5 KB, 532 views)
File Type: jpg VSSA PCB 11.jpg (458.0 KB, 642 views)
File Type: jpg VSSA PCB 12.jpg (968.9 KB, 749 views)
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