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Old 15th April 2008, 09:32 PM   #101
EUVL is offline EUVL  Europe
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Correct me if I am wrong.

I think you need to at least connect the centre point of R3 to that of R4, or you have no current through the 1st stage.

And no Super-Symmetry ?


Patrick
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Old 15th April 2008, 09:40 PM   #102
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by EUVL
Correct me if I am wrong.

I think you need to at least connect the centre point of R3 to that of R4, or you have no current through the 1st stage.

And no Super-Symmetry ?


Patrick

eyes are deceiving ?

4 x 50 ohms ;



even if values aren't appropriate
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Old 15th April 2008, 09:41 PM   #103
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Thank you Nelson for sharing the schematic, it's a darling amp, a 21st century Zen if you allow calling it that way.

ZV21?
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Old 15th April 2008, 09:44 PM   #104
EUVL is offline EUVL  Europe
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> eyes are deceiving ?
> 4 x 50 ohms ;

Are you sure ?

Patrick
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Old 15th April 2008, 09:46 PM   #105
TimS is offline TimS  New Zealand
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Default Simplified Balanced F5

There is current through the first stage, it flows through the feedback resistors.

This does work I have created a design similar but using all Mosfets.

I really didn't have time to simulate this, so i think most of the resistors are the wrong value, but as i said "a simplified design"
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Old 15th April 2008, 09:54 PM   #106
jam is offline jam  United States
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Default ........it seems like it was only yesterday!

Mr.Pass,

I hope you recover soon..........the guys at lab miss you. I have to congratulate you on another fine project well worthy as a replacement for the A-40.............Line stage next please or maybe a relay based attenuator to go with it.

Regards.

Jam
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Old 15th April 2008, 09:54 PM   #107
TimS is offline TimS  New Zealand
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Quad feedback, quadrant balanced, hyperbalanced

I like these parallel feedback designs they have unique advantages.
If a normal amp is driven into current clipping where 1/2 of the totem pole is fully turned off, the single feedback path has effectively lost control. With parallel feedback, with a feedback path controlling each quadrant, there will still be a feedback path that is in control while while the other half of the amp is clipping
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Old 15th April 2008, 09:56 PM   #108
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Hmmmm, something like this??

Click the image to open in full size.
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Old 15th April 2008, 09:56 PM   #109
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Anyone willing to comment on the published specs of the amp?

And what is Nelson’s suggestion on PSU filtering?
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Old 15th April 2008, 10:00 PM   #110
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Jam,

Glad to see you around. Are back from the dark side?
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