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Old 25th September 2011, 05:56 AM   #911
shaan is offline shaan  India
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MY SSA config on vero.

LC, like it?

p.s. left channel doesn't show the jumpers, but they will be added. they supply the 10ohm resistors.
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File Type: jpg DSC07493.JPG (168.2 KB, 869 views)
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Last edited by shaan; 25th September 2011 at 05:59 AM. Reason: jumper
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Old 25th September 2011, 06:28 AM   #912
Lazy Cat is offline Lazy Cat  Slovenia
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Yes Shaan I like it a lot, very nice layout on vero board, almost as it would be the real PCB. I'm sure the real one wouldn't differ much from this layout cause components are at just the right positions.

Now I know you are very experienced DIY builder, I also saw your previous amps on vero boards, you have the knowledge and skills, so I think this one would be a piece of cake to make the music play. Also if there will be some issues we will find the way out easily. In the mean time bigun started to sim his TGM5 amp and came out with thermal stability solution for Vbe multiplier which can also be used here if needed. So be confident and go on, others will be here to watch and share the pleasure. Regards, Andrej
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Old 25th September 2011, 07:19 AM   #913
Lazy Cat is offline Lazy Cat  Slovenia
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Exclamation SSA BIGBT Basic Voltages

Here is SSA BIGBT Basic schematic equiped with orientational voltages for troubleshooting purposes.

Lucky troubleshooting.
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Old 25th September 2011, 08:02 AM   #914
Josip_Del is offline Josip_Del  Dubai
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Quote:
Originally Posted by Lazy Cat View Post
Here is SSA BIGBT Basic schematic equiped with orientational voltages for troubleshooting purposes.

Lucky troubleshooting.
Thanks Lazy this will help
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Old 25th September 2011, 02:54 PM   #915
smartx21 is offline smartx21  Brazil
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Shaan, I enjoy your approach to reinforce heat sinking with those front small sinks!
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Last edited by smartx21; 25th September 2011 at 02:59 PM.
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Old 25th September 2011, 07:39 PM   #916
Lazy Cat is offline Lazy Cat  Slovenia
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Exclamation SSA BIGBT Basic Voltages

Quote:
Originally Posted by Lazy Cat View Post
Here is SSA BIGBT Basic schematic equiped with orientational voltages for troubleshooting purposes.

Lucky troubleshooting.
I was asked to publish also the original schematic with marked voltage points for 24V AC supply and here it is.
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Old 26th September 2011, 02:22 AM   #917
gannaji is offline gannaji  India
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Dear shaan,
Those Heatsinks look nice! Are they available anywhere in India? Can you give me the source in India for the Semiconductors also?
--gannaji
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Old 26th September 2011, 04:54 AM   #918
shaan is offline shaan  India
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Quote:
Originally Posted by Lazy Cat View Post
Yes Shaan I like it a lot, very nice layout on vero board, almost as it would be the real PCB. I'm sure the real one wouldn't differ much from this layout cause components are at just the right positions.

Now I know you are very experienced DIY builder, I also saw your previous amps on vero boards, you have the knowledge and skills, so I think this one would be a piece of cake to make the music play. Also if there will be some issues we will find the way out easily. In the mean time bigun started to sim his TGM5 amp and came out with thermal stability solution for Vbe multiplier which can also be used here if needed. So be confident and go on, others will be here to watch and share the pleasure. Regards, Andrej
Thanks for the kind words LC. I hope my SSA will run without any problems; it's finished and ready to be tested. The only concern I have is the 2k2 pot, which is not multiturn and I could not find a MT pot here. So, maybe, I'll need a servo after all... or maybe not, depending on the pot's influence on the offset.

Thanks for visiting my vero-thread, if you have some old vero designs in archive please post them there.

Quote:
Originally Posted by smartx21 View Post
Shaan, I enjoy your approach to reinforce heat sinking with those front small sinks!
Thanks. The idea came to me from Rod Eliott. Twice the effect with half the holes.

Quote:
Originally Posted by gannaji View Post
Dear shaan,
Those Heatsinks look nice! Are they available anywhere in India? Can you give me the source in India for the Semiconductors also?
--gannaji
I found them in Kolkata chandni market; the old/used equipment sellers lane, for one-fifth the retail price! These are AMD cpu heatsinks and they can dissipate 100watts with medium air flow. I plan to use them in SSA with a thermo-fan control for the fans.

All the semiconductors used in SSA are available at Nahar Electronics in Chandni market Kolkata. They are very mature suppliers and everydbody knows their shop location, ask anyone in chandni and you'll get there.
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Last edited by shaan; 26th September 2011 at 04:56 AM.
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Old 26th September 2011, 10:49 AM   #919
shaan is offline shaan  India
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People, I'm about to test it right now. Wish me good.

LC, do we need thermal joint between the cascode transistors?
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File Type: jpg DSC07498.JPG (131.7 KB, 338 views)
File Type: jpg DSC07500.JPG (379.7 KB, 783 views)
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Old 26th September 2011, 11:36 AM   #920
Lazy Cat is offline Lazy Cat  Slovenia
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Nice built Shaan

No, cascode BJT's doesn't have to be thermally coupled because their hFE/temperature tracking won't change input collector current. As I see in the pic they are in correct position.

Be careful with start-up procedure minimum bias, fuses/current limiting resistors etc. Please connect output mosfets to PCB with shortest wires as possible.

Good Luck & Enjoy.
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