F5 power amplifier - Page 11

EUVL · 15th April 2008, 09:32 PM

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

Zen Mod · 15th April 2008, 09:40 PM

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

apassgear · 15th April 2008, 09:41 PM

Thank you Nelson for sharing the schematic, it's a darling amp, a 21st century Zen if you allow calling it that way.

ZV21?

EUVL · 15th April 2008, 09:44 PM

> eyes are deceiving ?
> 4 x 50 ohms ;

Are you sure ?

Patrick

TimS · 15th April 2008, 09:46 PM

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"

jam · 15th April 2008, 09:54 PM

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

TimS · 15th April 2008, 09:54 PM

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

jackinnj · 15th April 2008, 09:56 PM

Hmmmm, something like this??

apassgear · 15th April 2008, 09:56 PM

Anyone willing to comment on the published specs of the amp?

And what is Nelson’s suggestion on PSU filtering?

apassgear · 15th April 2008, 10:00 PM

Jam,

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

15th April 2008, 09:46 PM	#105
TimS diyAudio Member Join Date: Feb 2004 Location: Auckland	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"

15th April 2008, 09:54 PM	#106
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	........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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15th April 2008, 09:32 PM	#101
EUVL diyAudio Member Join Date: Oct 2003	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

15th April 2008, 09:41 PM	#103
apassgear diyAudio Member Join Date: Nov 2002 Location: Viña del Mar, Torreon	Thank you Nelson for sharing the schematic, it's a darling amp, a 21st century Zen if you allow calling it that way. ZV21?

15th April 2008, 09:44 PM	#104
EUVL diyAudio Member Join Date: Oct 2003	> eyes are deceiving ? > 4 x 50 ohms ; Are you sure ? Patrick

15th April 2008, 09:54 PM	#107
TimS diyAudio Member Join Date: Feb 2004 Location: Auckland	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

15th April 2008, 09:56 PM	#108
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Hmmmm, something like this??

15th April 2008, 09:56 PM	#109
apassgear diyAudio Member Join Date: Nov 2002 Location: Viña del Mar, Torreon	Anyone willing to comment on the published specs of the amp? And what is Nelson’s suggestion on PSU filtering?

15th April 2008, 10:00 PM	#110
apassgear diyAudio Member Join Date: Nov 2002 Location: Viña del Mar, Torreon	Jam, Glad to see you around. Are back from the dark side?

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