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Old 23rd April 2013, 04:49 PM   #731
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OK, i understand.
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Old 23rd April 2013, 04:50 PM   #732
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So you may be the first HighEnd person that heard the InterFet part.
Kudos to your schutzpa.
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Old 23rd April 2013, 04:54 PM   #733
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I guess

I was really impressed by the sound that almost makes me wonder if a more complex full feedback and compensated buffer like Calvin will sound any better.
Then on the other hand, you are the expert on buffers (and not only!) and if you say that it is the best you have ever heard, then it must be really sound good.
Beside for a fully balance you need at least 4 IF3602 whjich ends up being almost $160 just for 4 parts!
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Last edited by Stefanoo; 23rd April 2013 at 04:57 PM.
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Old 23rd April 2013, 05:24 PM   #734
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I really can not tell what sounds better. The Calvin buffer is sounding better then the Paradise buffer though. Maybe it is not the lower distortion but the higher current delivering possibility. Like driving a car with a bigger engine.
Well, you started that adventure of using the most exotic parts so do not complain that it is getting expensive.
If they really bring an audible benefit i think it is money well spend.
I even think on this thread it is possible to include subjective impressions more then on the Pardise thread. This stage will be expensive to build and is more complex so it is for the chosen few only anyway.
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Old 23rd April 2013, 06:39 PM   #735
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Quote:
Originally Posted by Joachim Gerhard View Post
I really can not tell what sounds better. The Calvin buffer is sounding better then the Paradise buffer though. Maybe it is not the lower distortion but the higher current delivering possibility. Like driving a car with a bigger engine.
Well, you started that adventure of using the most exotic parts so do not complain that it is getting expensive.
If they really bring an audible benefit i think it is money well spend.
I even think on this thread it is possible to include subjective impressions more then on the Pardise thread. This stage will be expensive to build and is more complex so it is for the chosen few only anyway.
ahahaha!! Yest when I wrote about $160 I realized I didn't add that statement i.e. this is a no cost-compromise design either way.
Well, the IF3602 added a definitive audible different over the simple buffer used on Paradise (only not cascoded which, again, unpopularly IMHO the cascoded version with J310 sounds worse than the version without cascode. This is just my subjective validation. In the other hand it is not like I spent different listening sessions trying with and without, so maybe on long term listening I would end up preferring the cascoded version over the normal one).

If no cost objective is a concerned here, which it shouldn't, then I would use 4 IF3602 per channel each one biased at 15mA where current source is made with half of the IF to match better thermal drift and output offset; then move the servo before the buffer.

I will give it a try to it tonight see if:

1) gets rid of the distortion
2) sounds any better than only one
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Old 23rd April 2013, 06:41 PM   #736
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Quote:
Originally Posted by Joachim Gerhard View Post
.....I even think on this thread it is possible to include subjective impressions more then n the Pardise thread. This stage will be expensive to build and is more complex so it is for the chosen few only anyway.
I really like this approach!
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Old 23rd April 2013, 07:06 PM   #737
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Should I on the proto's layout include Calvin's buffer or the double IF3602's?

If I include the latter you won't be able to test it as is but you can always put your external board on it.
I could also do viceversa i.e. put Calvin's and then put the external board with the IF on to compare.
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Old 23rd April 2013, 07:12 PM   #738
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Maybe you can add one of these EEVblog #460 - Mailbag - Plasma Speaker - YouTube it would be a good hi-(Voltage)-end component.
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Old 23rd April 2013, 08:32 PM   #739
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This is probably the version I am going to build if it's ok with developers here (Joachim, Franz, MiiBi).
Since it is not cost objective design, the IF3602 proved to be that much better over the "standard" paradise buffer.
This doesn't mean it will be on the final design as once proto is in a comparison with other buffer will be run.

If so I will try to enter this on Caputure hopefully tonight (however need to try the two paralled IF3602 at lower current to verify that sound is mantained or bettered and if distortion is gone, so time might be a bit tight).
Once schematic on Capure is completed I will post here so we can all review it before going to layout.

Here is what I have on the simulator so far. This is really an exciting design.
I will also try in the next days to see if phono can operate without ground from regulators thus with a complete floating audio ground.
Attached Images
File Type: jpg updated floating IF3602.JPG (116.4 KB, 79 views)
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Old 23rd April 2013, 08:46 PM   #740
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Quote:
Originally Posted by Stefanoo View Post
This is probably the version I am going to build if it's ok with developers here (Joachim, Franz, MiiBi).
Since it is not cost objective design, the IF3602 proved to be that much better over the "standard" paradise buffer.
This doesn't mean it will be on the final design as once proto is in a comparison with other buffer will be run.

If so I will try to enter this on Caputure hopefully tonight (however need to try the two paralled IF3602 at lower current to verify that sound is mantained or bettered and if distortion is gone, so time might be a bit tight).
Once schematic on Capure is completed I will post here so we can all review it before going to layout.

Here is what I have on the simulator so far. This is really an exciting design.
I will also try in the next days to see if phono can operate without ground from regulators thus with a complete floating audio ground.
You need to connect the servo to the output of the buffer, otherwise vgs (when connected to the input (as shown ())) of the fet's is used to create an imbalance in the mirrors. And if you insist, the experiment (that fails / will fail) will be to switch it to the buffer input (and back (very fast)).

Edit: Wrong I was. I should have said that the vgs of the fet's would be translated in a output offset if the servo-input is connected to the buffer input.

Last edited by FdW; 23rd April 2013 at 09:00 PM.
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