There is a few flaws in the schematics, but not in the signal path.
So do not use the schematics to build the preamp, use the Gerbers available and follow the instruction.
We do not want anybody to build according to the schematics, as the layout is part of the performance. And of course the PCB is completely free of errors, as is the BOM.
There is no LM 337 only 4 pcs of LM317.
Your question marks about the design, is exactly what we do not want to discuss.
And if that keeps you from building it, that´s alright with us.
We care about the lot wanting to build our preamp, and less about the few people wanting to discuss it.
Why are you pushing alternative designs here in our thread?
It would be more natural to open your own thread, and help people out building it.
Btw. You design looks nice but it is full of caps.
@Nico Ras
Just came across your picture of your project.
And I must say, that this kind of amp is exactly what we did not want to build.
This type of design was pretty much what we had already.
If you look at our design, you´ll see, that there is only one capacitor in each channel.
This is the cap determining the cut off frequency in the servo circuit, which is chosen to low to do anything else than temp drift.
There are not even decoupling caps in the power supply.
The design does not need bandwith limitation ore anything like that. It is perfectly stable @ any frequency without.
And believe me, it both performs and sounds much better without.
These things are often very hard to discuss. Most people want big power supplies with sufficient + electrolytic caps.
In our design we chose shunts, that equals 1.000.000µF pr. channel, but without the impedance problems of caps.
Besides being both a performance and soundwise superior solution, it also takes up a lot less of space and costs a lot less.
The straight forwardness, the compactness, the lack of caps, the very low noise and low impedance PSU, the low servo cut off and the choice of especially transistors, are the main reasons for the sound quality praised so much by those who build it up until now.
Some of these upsides can be measured, some cannot, or at least we do not know how to.
But believe me, these are matters of concern.
Just came across your picture of your project.
And I must say, that this kind of amp is exactly what we did not want to build.
This type of design was pretty much what we had already.
If you look at our design, you´ll see, that there is only one capacitor in each channel.
This is the cap determining the cut off frequency in the servo circuit, which is chosen to low to do anything else than temp drift.
There are not even decoupling caps in the power supply.
The design does not need bandwith limitation ore anything like that. It is perfectly stable @ any frequency without.
And believe me, it both performs and sounds much better without.
These things are often very hard to discuss. Most people want big power supplies with sufficient + electrolytic caps.
In our design we chose shunts, that equals 1.000.000µF pr. channel, but without the impedance problems of caps.
Besides being both a performance and soundwise superior solution, it also takes up a lot less of space and costs a lot less.
The straight forwardness, the compactness, the lack of caps, the very low noise and low impedance PSU, the low servo cut off and the choice of especially transistors, are the main reasons for the sound quality praised so much by those who build it up until now.
Some of these upsides can be measured, some cannot, or at least we do not know how to.
But believe me, these are matters of concern.
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The point is, that there is pretty much going on out of your sight.
The number of Mails and PM´s are substantial, and the number of downloads are amazing.
If no one will build it, and if no one of the guys who did build it after all likes it, then the thread should not be kept alive for any reason anyway.
LOL!
Kurt, You have a strange and unique marketing approach - seems like 'just do it'.
But, a picture is worth a thousand words. Can you show one?
Anyway, whatever the outcome, good luck Kurt!
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LOL!
Kurt, You have a strange and unique marketing approach - seems like 'just do it'.
But, a picture is worth a thousand words. Can you show one?
Anyway, whatever the outcome, good luck Kurt!
Look at the very first post on page 1.
Download the building instructions.
There you have your photos.
In Analog Line Forum, Solid State Forum etc., we usually discuss certain circuit topology, whis is at least partially disclosed. For plain business purposes, there is a commercial sector here
Commercial Sector - diyAudio
Commercial Sector - diyAudio
As the whole thing is just given away for free, why should it be on commercial sites then?
You can do this preamp completely without anything else than published in this thread. Everything is tested,, Gerbers are at hand, and a complete BOM is downloadable.
We just do not want to discuss the design with anybody.
We have no Kits, No PCB´s no nothing besides the files to do it your self.
It seems if you just did not read the thread, but commented anyway.
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