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Old 24th August 2011, 09:37 AM   #391
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Exclamation SSA High Performance BIGBT

According to my current needs and personal taste I will start to make something like this.
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Old 24th August 2011, 09:40 AM   #392
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Hi am most pleased with the L-MOSFET version and that is why I have not had any further contributions to the thread.

Those who want to run with the simplest of the suggestion would end up with an excellent product that will be very hard to beat.

I have compared to listening to the BJT version as well and cannot hear any difference that would make me prefer the more complex versions. The L-MOSFET version sounds absolutely superb, is unconditionally stable and currently used on 4 ohm speaker and 32VDC supply.


Kind regards

Nico
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Old 24th August 2011, 09:44 AM   #393
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Lazy Cat, well done, you have brought something superbly different to DIY audio, thank you.

Kind regards

Nico
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Old 24th August 2011, 09:56 AM   #394
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My deepest gratitude for all your support Nico. I am pleased that you enjoy in music with your SSA amp.

Yes, two things I brought to this forum BIGBT and SSA front-end and some ideas how to implement these, that's all.

Best regards, Andrej
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Old 24th August 2011, 10:31 AM   #395
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Quote:
Originally Posted by MiiB View Post
One thing i have trouble seeing through is how to adjust the current through the input pair/cascodes
SSA front-end collector current:

Ic=Ie-Ic/β

Ie=((15V-0,6V-Re*Ie)/Rs)-((0,6V+Re*Ie)/(Rfo*Rfg/(Rfo+Rfg)))

Ic - desired cascode collector current
Ie - emitter current through input BJT
β - input BJT current gain
Re - input BJT emitter resistor
Rs - current supply resistor (resistor connected between 15V supply and emitter resistor)
Rfo - feedback resistor from OUT
Rfg - feedback resistor to GND

Simple as that.
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Last edited by Lazy Cat; 24th August 2011 at 10:54 AM.
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Old 24th August 2011, 10:46 AM   #396
MiiB is offline MiiB  Denmark
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Thanks... I now run 3 mA through the input/cascode.. 20 mA through the VAS and 200 mA in the output sets...

Getting PCB's-done and will start assembling i app. 2 weeks time...looking forward...
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Old 24th August 2011, 10:54 AM   #397
AKSA is offline AKSA  Australia
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LC, you are being modest; no need for that, take a bow!!

I would say that your circuit is the fully complementary big brother to FetZilla, and one day I hope to compare the two.

I have a notion that the SE circuit will have higher even than odd order distortion.

Again, thank you,

Hugh
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Old 24th August 2011, 12:03 PM   #398
alex mm is offline alex mm  Europe
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Default SSA BIGBT PCB rev 1.5

......and now rev 1.5 for BIGBT variant ...... please check PCB for errors , not tested .
Alex.
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Old 24th August 2011, 12:16 PM   #399
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Alex, so this is now schematic from post 217 ?
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Old 24th August 2011, 12:19 PM   #400
radio is offline radio  Macedonia
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Alex mm, well done!
By which schematic this was done PCB?
Regards
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