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Old 30th January 2012, 10:39 PM   #5021
MiiB is offline MiiB  Denmark
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please put a drawing up.. i don't have the schematic here....so I have no reference to the R19
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Old 30th January 2012, 10:54 PM   #5022
hesener is offline hesener  Germany
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here you go. I am a little bit concerned with these inconsistencies, was under the impression that this R19 is 15k, and thats what I put in my paradise, and its working very well with it.

Let's take this schematic as the base to adress any changes going forward please
thanks
Attached Files
File Type: pdf Paradise MPP 2012 official schematic 29.1.2012.pdf (61.0 KB, 113 views)
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Old 30th January 2012, 11:02 PM   #5023
hesener is offline hesener  Germany
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ohoh....... I reviewed my files, and here is a schematic from jan 19, that implements a few more changes that had been discussed in this trail
R19=15k
220Ohm "Neumann" resistor
but, R47 / R51 = 22 Ohm

hope that clarifies it.... I don't think I will be going through 50pages of postings to find out, lets take the working boards to measure and finetune......
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Old 30th January 2012, 11:04 PM   #5024
hesener is offline hesener  Germany
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... this time with the file....
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File Type: pdf ParadiseAmp r2 19 01 2012.pdf (26.7 KB, 104 views)
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Old 30th January 2012, 11:18 PM   #5025
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I am blind tonight. Where is R19 ?
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Old 30th January 2012, 11:37 PM   #5026
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I found it. It drains the current in the current mirror of the buffer. R19 is 15kOhm in my schematic.
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Old 31st January 2012, 12:32 AM   #5027
brianco is offline brianco  Ireland
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Joachim....

Your message box is full again!

Brian
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Old 31st January 2012, 06:14 PM   #5028
sampler is offline sampler  Lithuania
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Quote:
Originally Posted by Joachim Gerhard View Post
What i would really like to see is your design in parallel symmetric ( if better or necessary ) with a balanced, differential input stage. J-Fet input or not. If we only use N-Channels this is not a component sourcing problem anyway. We can call that the Starless-Balanced and i would 100% support that design.
Believe me, I would like it too, I had to spend couple weekends improving my tt wiring, shielding and cabling to get rid of all that mains stuff down to -80dB, and with balanced that would be no problem at all. But then again, with balanced we have two opposing currents that can't be mirrored directly or it will cancel out, and I really love all this transimpedance mirrors feeding riaa network stuff. This concept of starless and following phonos got me intrigued in first place. So this has to go back to drawing board from scratch, or if someone has something to propose regarding balanced front end with 2 in phase currents output (preferably no LTP) I'm all yours. Meanwhile, more bjt sorting... more meditation
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Old 1st February 2012, 12:10 AM   #5029
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Here is a simple idea. The output would be differential of cause so we can not simply sum it for unbalanced. It would cancel. For unbalanced we need a high CMR INA like the Thats 1200. The Fets at the input should be cascoded. This shows only the principle.
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Old 1st February 2012, 12:12 AM   #5030
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From base T7 to emitter T5 there is a connection missing, sorry.
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