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Old 26th August 2011, 03:03 PM   #461
alex mm is offline alex mm  Europe
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Default SSA BIGBT PCB rev 1.5

same PCB dressed same size 145 mm X 86 mm and B & W file for toner transfer or photo ...... Thanks for the kind words addressed to me
Alex.
Attached Images
File Type: jpg SSA BIGBT BASIC 1.1.jpg (373.7 KB, 913 views)
Attached Files
File Type: pdf SSA BIGBT BASIC 1.1ALL.pdf (109.5 KB, 326 views)
File Type: pdf SSA BIGBT BASIC 1.1 BW PCB.pdf (33.3 KB, 279 views)
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Old 26th August 2011, 04:06 PM   #462
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Quote:
Originally Posted by AKSA View Post
Ah, not quite what I meant, but interesting nonetheless......

I think these devices would be very suitable for hard rock, I really do.


Hugh
Hard rock, anyone get the pun???
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Old 26th August 2011, 04:18 PM   #463
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Quote:
Originally Posted by alex mm View Post
same PCB dressed same size 145 mm X 86 mm and B & W file for toner transfer or photo ...... Thanks for the kind words addressed to me
Alex.
Nice Board! One question, is this rev 1.5 or 1.1? the post says 1.5, the files 1.1

I am saving all the schematics and boards.
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Old 26th August 2011, 04:21 PM   #464
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Quote:
Originally Posted by MiiB View Post
LC....

I was thinking your basic circuit, but with lateral fets (2SK216/2SJ79 instead of the IRF 9610/610.. the laterals have only two third's of the Ciss capacitance...and also negative tempco...So I believe you can take away the VBE and instead use the simpler resistor biasing
MiiB I successfully built the one that you are referring to last year in Decmeber, it sounded stunning and is currently my main listening amplifier.
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Old 26th August 2011, 04:29 PM   #465
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@odysseybmx414

It's written on the bottom of PCB:
Schematic Lazy Cat rev1.1
PCB by Alex MM rev1.6

@alex mm

Capacitor to the left of your logo is 1uF/63V, but you wrote 1000mF/16V.
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Old 26th August 2011, 04:32 PM   #466
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Quote:
Originally Posted by MiiB View Post
LC....

I was thinking your basic circuit, but with lateral fets (2SK216/2SJ79 instead of the IRF 9610/610.. the laterals have only two third's of the Ciss capacitance...and also negative tempco...So I believe you can take away the VBE and instead use the simpler resistor biasing
Hi Miib

Of course IRF's can be replaced with 2SK216/2SJ79 but I am not sure if the tempco sum will be flat. If so, than SSA BIGBT Basic can be built without Vbe multiplier. Now when the board is ready you can check that in practice.

I will use this board as prototype base PCB for SSA BIGBT High Performance version.
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Old 26th August 2011, 05:12 PM   #467
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Hi Lazy Cat,

Quote:
Originally Posted by MiiB View Post
LC....

I was thinking your basic circuit, but with lateral fets (2SK216/2SJ79 instead of the IRF 9610/610.. the laterals have only two third's of the Ciss capacitance...and also negative tempco...So I believe you can take away the VBE and instead use the simpler resistor biasing
I had a similar circuit with IRF620/IRFP620 and i had problems with a stable BIAS.

I also would make thicker traces for the power-BJT in the layout.

But I like your circuit
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Last edited by moschfet; 26th August 2011 at 05:15 PM. Reason: forget to say
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Old 26th August 2011, 05:20 PM   #468
radio is offline radio  Macedonia
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Question Heppy End??1

When will we see almost made ​​amplifier with a happy ending?
cheers !!
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Old 26th August 2011, 06:01 PM   #469
MiiB is online now MiiB  Denmark
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Nico...

was that with my (kind of sort off folded cascode) front end,,,PCB looks really good...

M
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Old 26th August 2011, 06:15 PM   #470
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by Lazy Cat View Post
Very well Bigun, nice incarnation of SSA.

Please feel freely to experiment further.
I'm not sure I'm happy with this (Bigun's SSA) design afterall - the current through the Vbe multiplier isn't well defined and the operating points are a bit of a compromise.
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