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Old 1st May 2012, 10:33 AM   #461
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Good idea.
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Old 1st May 2012, 11:14 AM   #462
sonnya is offline sonnya  Denmark
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Last schematic before PCB.
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File Type: pdf TSSA-01010512.pdf (53.9 KB, 275 views)
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Old 1st May 2012, 11:18 AM   #463
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Looks good to me. So you are using 2,2kOhm for R7, R8.
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Old 1st May 2012, 11:22 AM   #464
sonnya is offline sonnya  Denmark
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I will maybe change that but with the predriver there will be an additional vgs drop of 1 - 2V and with the predriver the higher value will not be a problem.
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Old 1st May 2012, 01:01 PM   #465
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Quote:
Originally Posted by sonnya View Post
Last schematic before PCB.
Hi Sonnya

For the testing purposes schematic is OK, but casoded Sziklai compounds and enhanced rails nested CCS-s were used in the first place to eliminate the need for extra CCS-s, which therefore don't legitimate their presence. Measurements will clearly show if the ratio of benefit vs. unnecessary extra complexity would be justified. In the same manner we can think about using DC servo.

Anyway, I hardly wait to see the PCB layout
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Old 1st May 2012, 02:03 PM   #466
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Lazy Cat View Post
Hi Sonnya

For the testing purposes schematic is OK, but casoded Sziklai compounds and enhanced rails nested CCS-s were used in the first place to eliminate the need for extra CCS-s, which therefore don't legitimate their presence. Measurements will clearly show if the ratio of benefit vs. unnecessary extra complexity would be justified. In the same manner we can think about using DC servo.

Anyway, I hardly wait to see the PCB layout
Thats why i have added solderjumps to the ccs bias circuit
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Old 1st May 2012, 02:11 PM   #467
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Quote:
Originally Posted by sonnya View Post
Thats why i have added solderjumps to the ccs bias circuit
Yes I saw that too.

And there is still possibility no to use Sziklais than these could come handy.

Please say something more about PCB, maybe dimensions, layers, etc. Thanks Sonnya

Last edited by Lazy Cat; 1st May 2012 at 02:21 PM.
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Old 1st May 2012, 03:36 PM   #468
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Lazy Cat View Post
Yes I saw that too.

And there is still possibility no to use Sziklais than these could come handy.

)
?? Could you explain?
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Old 1st May 2012, 10:22 PM   #469
sonnya is offline sonnya  Denmark
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First layout - placement

Back side of PCB will be mainly GND plane.
Attached Files
File Type: pdf TSSA-01010512.pdf (57.9 KB, 143 views)
File Type: pdf tssa-01010512-top.pdf (29.7 KB, 133 views)
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Old 1st May 2012, 10:29 PM   #470
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As far as i understand Lazy Cat he thinks that your bias arangement is obsolete when we use the Fet Cascoded Sziklay ( FCS ).
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