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Old 15th January 2012, 05:02 PM   #1701
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Hi maxente

Nope, the last SSA PCB in cooperation with Alex was 198x120mm on my layout proposal and than Alex refused to go to smaller dimension. So I did it my way completely, very compact, very low Z or high speed if you like, ended at 160x120mm as you can see on pic. SSA BIGBT HP PCB layout was my design from the start.
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Old 15th January 2012, 07:55 PM   #1702
maxente is offline maxente  Romania
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Thanks for answer
From the picture it looks almost the same
BTW nice design, i will build this amp some day (soon i hope ) especially whit BIGBT to test the sound
How did you came up with this configuration of bipolar and mosfet for output stage? Very interestig indeed

Sorry for those stupid questions, i am just a hobbyist
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Old 15th January 2012, 09:12 PM   #1703
alex mm is offline alex mm  Romania
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...... I dont think so .... thanks anyway.
Alex.
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Old 15th January 2012, 09:34 PM   #1704
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Hi guys

Today I finished assembly of the first SSA BIGBT HP channel, than made usual initial measurements, as everything was really just perfect, naturally I started with listening some wave music files in my lab ...

P.S. Now I am soldering another channel ...
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Old 15th January 2012, 09:59 PM   #1705
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Quote:
Originally Posted by alex mm View Post
...... I dont think so .... thanks anyway.
Alex.
Hi Alex

On 27th Nov I sent you the message of mine compact PCB layout attached and you've said you won't go to so small PCB:"... because it is not all right, it is too small place to arrange all devices.", (your text - words) and than after I decided I will do it on my own.

Alex, the PCB from 30th Nov is your later version of my proposed 170x120mm layout I have sent you on 27th Nov and to which you said no. I'm sorry I really needed that dimension so I did it myself, you can see why in upper post.

P.S. On 1st Dec from your attached e-mail you still claimed it is impossible to layout in two layers, maybe in three or four ... but I did it in two layers with no vias, only pads for components.
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Old 15th January 2012, 10:12 PM   #1706
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Andrej,

So, when are you going to offer a group buy or sell your HP SSA PCB and soft start? I'm so interested and curious to try your amp. Seems promising to me.

Regards,

Fred
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Old 16th January 2012, 07:40 AM   #1707
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Quote:
Originally Posted by maxente View Post
Thanks for answer
From the picture it looks almost the same
The same component layout based on my very precise hand drawn layout on mm grid paper, which BTW I always keep by myself, but completely different tracks route. I explained it all in upper post.

Quote:
Originally Posted by maxente View Post
BTW nice design, i will build this amp some day (soon i hope ) especially whit BIGBT to test the sound
Thanks maxente, yes very dense component placement in terms of an amplifier design but it looks I cannot help myself, I did it the same almost every time I designed a PCB for my amplifiers: ProJet Power Module, Monolith, ...

Quote:
Originally Posted by maxente View Post
How did you came up with this configuration of bipolar and mosfet for output stage? Very interestig indeed

Sorry for those stupid questions, i am just a hobbyist
BIGBT transistor came to my idea many years ago when I realize flaws of prefabricated IGBT semicondutors like GT20D101/201 and Bryston's flaw of using all bipolar design so I made discrete BIGBT. As you can see in my schematics I always drawn it in a separate box and that's because I consider BIGBT as one transistor (gain component) only. It is inherently stable, very easy to drive (high Z/low C gate input), mosfet in the middle shares/conduct only one (automatically doubles hFE) and the same base current for both outputs, resulting in identical (same waveform) collector currents of the output BJT-s. All internal currents are well defined, adjustable, balanced and at the end it acts as one non-problematic monolitic transistor, which I tested countless times. The only selection one has to make is to match NPN/PNP output pair hFE's to +/-5%, that's all.
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Old 16th January 2012, 07:51 AM   #1708
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Quote:
Originally Posted by fredlock View Post
Andrej,

So, when are you going to offer a group buy or sell your HP SSA PCB and soft start? I'm so interested and curious to try your amp. Seems promising to me.

Regards,

Fred
Since I had oportunity to taste many of current HQ amplifiers I can assure you that this one belongs to the same category. Fredlock please wait to see end-product assembled in a case. Also this thread started more as educational one, but frankly speaking I don't know where it will ends.
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Old 18th January 2012, 07:09 PM   #1709
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Default progress?

@Salas, did you make any progress on your version? I liked your approach.

LC: any chance your build will be measured? I'm interested in distortion and noise. Before going to build anything I do want to know if it will be in "my ballpark"
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Old 18th January 2012, 08:58 PM   #1710
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LC, I'm wondering what's in that beautiful enclosure behind speaker?

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