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Old 29th August 2011, 05:20 PM   #551
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Alex, I am now tired of complimenting you :-)))
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Old 29th August 2011, 05:30 PM   #552
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Quote:
Originally Posted by alex mm View Post
...... PCB without relay , maybe more elegant , and with larger heatsink
I expect QC to do the job , and I will post PCB rev 1.8 in B&W .
Alex.
QC started ... now
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Old 29th August 2011, 06:07 PM   #553
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Nico, post 548 is a Rush Cascode.
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Old 29th August 2011, 06:20 PM   #554
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Here is a circuit that uses the Rush Cascode :
http://gaedtke.name/SubMenu_Verstaer...ompDiffAmp.pdf
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Old 29th August 2011, 06:25 PM   #555
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Quote:
Originally Posted by alex mm View Post
...... PCB without relay , maybe more elegant , and with larger heatsink
I expect QC to do the job , and I will post PCB rev 1.8 in B&W .
Alex.
QC report:

- face BJT's in left current source like on the right
- resistor between 4,7V and 15V zeners is 2,2k/2W (two)
- 1uF capacitor between 4,7V and GND is missing (two) very important GND decoupling (to input GND)
- parallel to 10.000uF put also decoupler cap 1uF/63V 5mm pin dist
- IRF gate resistors 000 are actually 47ohm degeneration resistors (silk change)
- please put 2 oposite gate protection zeners on each IRF like in SSA Basic, I will put them in sch later
- IRF9610 Source and Drain are mixed, it should be the Source to Base 2SA1987 and Drain to Base 2SC5359
- GND (SPK -) faston in between existing GND connectors is missing
- this SSA is more powerful than SSA Basic, so all the output traces should be thicker

That's the report from QC department.

Alex you are the best, regards Andrej
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Old 29th August 2011, 06:33 PM   #556
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Quote:
Originally Posted by Joachim Gerhard View Post
Nico, post 548 is a Rush Cascode.
Thanks.
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Old 29th August 2011, 09:04 PM   #557
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Quote:
Originally Posted by alex mm View Post
...... PCB without relay , maybe more elegant , and with larger heatsink
I expect QC to do the job , and I will post PCB rev 1.8 in B&W .
Alex.
Great boards latest ones alex! Especially without the diodes and output relay (although easily jumpered). I'm liking the higher voltage. +-50V is what I've got available to use, and I want to build this version (+-50V BIGBT). But, I don't have the +-60V for the front end.
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Old 29th August 2011, 09:27 PM   #558
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I don't understand why people here struggling with this BIGBT thingie that much. Was SSA standing for "Simple" Symmetrical Amplifier?
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Old 29th August 2011, 09:28 PM   #559
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Default PCB rev 1.8 corrected

....... last correction of last rev 1.8 of PCB
Alex.
Attached Images
File Type: jpg SSA BIGBT V1.8.jpg (447.2 KB, 897 views)
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Old 29th August 2011, 10:24 PM   #560
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Quote:
Originally Posted by odysseybmx414 View Post
Great boards latest ones alex! Especially without the diodes and output relay (although easily jumpered). I'm liking the higher voltage. +-50V is what I've got available to use, and I want to build this version (+-50V BIGBT). But, I don't have the +-60V for the front end.
Here you have the proposal for +/-60V for SSA front-end power supply. Actually it is complete power supply for one SSA BIGBT High Performance channel.
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