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Old 26th March 2013, 08:19 PM   #511
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Yes, MiiB and i reasoned that only one set of RIAA components could be sufficient.
Float them between the outputs. One buffer on each side follows.
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Old 26th March 2013, 08:52 PM   #512
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Watching and waiting for the final version of this design. I hope someone will take that an do the artwork for a board that can be produced? Looks like you are almost to the end of the development on this.
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Old 26th March 2013, 08:52 PM   #513
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Quote:
Originally Posted by MiiB View Post
Frans ... very very clever with the servo injection after the input stage in the current mirror, this will actually keep the input offset very very low and still correct the output, one may argue that they are in the signal path, but then again what servo is not.... This circuit can be very very good, only one thing needs to be done regarding the RIAA section.. two set of components must be reduced to one, which on the other hand should be pretty straightforward.
yeah reducing the RIAA to one would be very desirable, but how?

Well, the servo on the SE version is not on the signal path directly, while the one for the differential is right at the input.
Don't know at the end of the day it is good as long as it sounds good, so it will have to be tried.
Should I take charge and try it out?
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Old 26th March 2013, 08:58 PM   #514
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Originally Posted by Kindhornman View Post
Watching and waiting for the final version of this design. I hope someone will take that an do the artwork for a board that can be produced? Looks like you are almost to the end of the development on this.
not yet! It will take a while and if you read the initial post there might not be a board production of this circuit.
I have posted the inistial schematic picking up crums from Joachim and things I know and Frans has helped a lot with the servo...this is a nice team effort ....hopefully MiiB will help giving some advice with the only one RIAA
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Old 26th March 2013, 09:01 PM   #515
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Originally Posted by Joachim Gerhard View Post
Yes, MiiB and i reasoned that only one set of RIAA components could be sufficient.
Float them between the outputs. One buffer on each side follows.

Would it work that way? I don't get it!
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Old 26th March 2013, 09:11 PM   #516
MiiB is online now MiiB  Denmark
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It'll work.. well the servo might be right in the signal path, but as you only inject a tiny amount of allmost DC, I don't see it as a problem, it's still behind the mirror output...

try the RIAA shunt, you have the simulation.. Lets see how it works..
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Old 26th March 2013, 09:14 PM   #517
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Stefanoo View Post
Would it work that way? I don't get it!
Yes it will and it won't be there (sound like) (that is the input differential floating servo).
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Old 26th March 2013, 09:16 PM   #518
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Would it work that way? I don't get it!
gotcha! Let me try to see how it simulates and I will get back to you.
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Old 26th March 2013, 09:20 PM   #519
FdW is offline FdW  Netherlands
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I did tinker the values of the servo filters a bit more, and these values should be final. So here is the (my) final schema (including .asc).
Attached Images
File Type: png Balanced Paradise Input Output Offset Nulling by FdW Compleat.PNG (81.1 KB, 78 views)
Attached Files
File Type: asc FULL Balance BJTs.asc (21.0 KB, 7 views)
File Type: txt FULL Balance BJTs.txt (2.9 KB, 9 views)
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Old 26th March 2013, 09:21 PM   #520
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When we start something this deep we will finish it.
I think we have driven the circuit forward quite a bit today. Until it works perfectly can of cause consume much more time. Consider that it took 4 !!! years to make something as good as the Paradise and this has the high ambition to sound better.
Of cause prototyping can start right now but i do not expect that the circuit as is is playing perfectly right away. We have a strong concept though. If and how the servos affects sound
has to be seen. Without them DC coupling is an illusion. I say : let us DC couple.
Something this ambitious needs to be this way or we have that never ending story again about passive component choices. DC coupled, no paralleling of semiconductors etc.
Stefano set the goal anyway, we just have to find the right pace.
ATL moto of today : when there is an identified problem there is a solution, sooner or later. Mind over matter.
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