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25th July 2012, 10:44 AM
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#31 |
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diyAudio Member
Join Date: Oct 2003
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I thought you already built P2P ?
 Patrick
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25th July 2012, 11:12 AM
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#32 |
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diyAudio Member
Join Date: Mar 2009
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No, but i used the same principle in a phono stage. It works, that what i know.
I am waiting for the MosFets. |
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25th July 2012, 11:19 AM
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#33 |
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diyAudio Member
Join Date: Mar 2009
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The mosfets just came. Now i have everything to build it.
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25th July 2012, 11:26 AM
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#34 |
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diyAudio Member
Join Date: Mar 2009
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This is approximately the input stage of the bespoke phono.
The problem is not new to me and this is a topology that can be used more universal. So when the request came up to make a simple Bal-Umbal converter i already had a solution. I used current mirrors though. |
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25th July 2012, 11:39 AM
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#35 |
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diyAudio Member
Join Date: Oct 2003
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I know you like current mirrors.
I like the simplicity of cascodes. Matter of taste.  Patrick
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25th July 2012, 11:51 AM
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#36 |
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diyAudio Member
Join Date: Mar 2009
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I do mostly mirrors. MiiB, Sigurd and i have researched them now to a point where they virtually introduce no distortion. It is more complex then a cascode Widlar or Wilson though.
I use folded cascodes too but instead of the drain resistors i use constant current sources. They have their problems too like noise but that can also be solved. One of the reasons i went so far with mirrors is that the folded cascode is very well researched and we have very good and mature examples like the Blowtorch. I simply wanted to try something new. Driven cascodes are also very interesting and i found new ways to implement them. Lets see what will happen in the future. Electronics design is certainly still moving forward. |
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30th July 2012, 11:00 AM
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#37 |
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diyAudio Member
Join Date: Oct 2003
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Joachim,
Schematics and Infopak already sent to you by email, as requested. Cheers, Patrick
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30th July 2012, 04:09 PM
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#38 |
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diyAudio Member
Join Date: Mar 2009
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Thanks, i have now all that i need.
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31st July 2012, 08:44 AM
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#39 |
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diyAudio Member
Join Date: Oct 2003
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Not quite.
PCBs on their way. Patrick
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31st July 2012, 12:01 PM
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#40 |
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diyAudio Member
Join Date: Mar 2009
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That looks very good ! I am looking forward to make it play.
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