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Old 24th August 2011, 12:27 PM   #401
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Exclamation SSA BIGBT Basic

Great Alex !

This PCB will enable anyone to check the sound of the SSA BIGBT Basic version.

I will detaily check the PCB and let you know about all remarks soon, latest tomorrow. Thanks again Alex
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Old 24th August 2011, 12:32 PM   #402
sng001 is offline sng001  Australia
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Quote:
Originally Posted by Nico Ras View Post
I added the 3.3 pF FB capacitors only to band limit the amp in case of spurious pick-up from the speaker cables. Some FM tuners 10.7MHz can radiate IF and the amp can still operate at that frequency.

Regards

Nico
Hi Nico,

You posted this a while ago - Post #320.

Did you change the C12 & C13 from 12pF to 3.3pF?

You also said that you would implement some of the MiiB's changes, can you please post your latest schematics?

I plan to build the SSA with one pair of L-MOSFET running with 38V DC rails.

I will change AlexMM's layout a bit so that I can use 30mm (10000uF/50V) caps.


Best regards, Stanley
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Old 24th August 2011, 12:32 PM   #403
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Quote:
Originally Posted by Joachim Gerhard View Post
Alex, so this is now schematic from post 217 ?
Quote:
Originally Posted by radio View Post
Alex mm, well done!
By which schematic this was done PCB?
Regards
The upper one, from post #401, that is the SSA from my latest listening test.

It is almost the same as from #217, only emitter resistor is added to Vbe multiplier to track tempco more accurately. Otherwise the same sch.

Last edited by Lazy Cat; 24th August 2011 at 12:39 PM.
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Old 24th August 2011, 12:32 PM   #404
a.wayne is offline a.wayne  United States
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Originally Posted by alex mm View Post
......and now rev 1.5 for BIGBT variant ...... please check PCB for errors , not tested .
Alex.
Hey what happened to the bigger version ....?
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Old 24th August 2011, 12:41 PM   #405
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Thanks LC.
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Old 24th August 2011, 12:42 PM   #406
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Quote:
Originally Posted by a.wayne View Post
Hey what happened to the bigger version ....?
Be little patient, we have only "The one and only" Alex here.
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Old 24th August 2011, 12:45 PM   #407
a.wayne is offline a.wayne  United States
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Yes.... that he is for sure....
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Old 24th August 2011, 12:57 PM   #408
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by AKSA View Post
I like your approach, Bigun. Very elegant, and the emitter driver output will have low impedance and drive the output stage very well.

Let's see, base to rail resistor for predriver would be 1K, we could run the driver quiescent at around 30mA, and this means, assuming cascode current is 2mA, the predriver emitter to rail resistor would be 47R. With a Zout at each driver emitter of around 1R, you'd have enough drive to propel the USS Nimitz, and of course nice local feedback around the driver circuit. One change, however; I'd put a 1K resistor from emitter to base on each driver to ensure residual current at all times through the predriver.

Cheers,

Hugh

PS I'm not dead sure of the cascode current, but 2mA seems about right to me.

Hugh

Thanks Hugh for that input, it does indeed need these things to flesh out the design and it's good to know that you also have some confidence in this version.
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Old 24th August 2011, 12:58 PM   #409
radio is offline radio  Macedonia
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Thumbs up Changes!?

Hi Lazy Cat (Hi Slovenija)!
I have a few questions about this amplifier.
Is it can replace the bias transistor BC550C with BD139 (better is to mount the fridge) or some are needed changes?
For the output transistors can be used ate MJ15003/MJ15004?
In the end, I ask you in a few sentences if you are able to explain how this amplifier?
It will be interesting for electronic amateurs!?
thanks and cheers !

Last edited by radio; 24th August 2011 at 01:10 PM.
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Old 24th August 2011, 12:59 PM   #410
juma is offline juma  Germany
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Quote:
Originally Posted by a.wayne View Post
Hey what happened to the bigger version ....?
That's what happens when we have a thread with 100 schematics and neither of them has a clear, distinctive name...
The best we can do now is to refer to them by post number.
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