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25th January 2011, 09:25 AM
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#1 |
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diyAudio Member
Join Date: Mar 2004
Location: Krakow
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MEMDIST POWER AMP + JC + TMC - help to set up
Hi,
I was hot after reading about headamp from peufeu Memory Distortion Philosophies - Part 8 : More tests and wanted to build higher power version for LS driving. Please look at the schematic, I added JC-like coupling within the mirror and VAS then I wanted use TMC like gnfb correction like Edmond Stuart proposed Bob Cordell Interview: Negative Feedback and got this. Please help to adjust the values/other parameters to obtain the amp possible for working, I believe that the combination of memdist/TMC correction might give something better that "Lavardin" sound. Additional explain: I hate global nfb  and believe that that solution in most cases spoils the sound,however with you help will this be good sounding? 
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regards, Pawel |
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28th January 2011, 10:07 AM
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#2 |
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diyAudio Member
Join Date: Mar 2004
Location: Krakow
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ok
here are initial settings and sim results
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regards, Pawel |
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28th January 2011, 10:10 AM
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#3 |
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diyAudio Member
Join Date: Mar 2004
Location: Krakow
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and here clipping
Seems that bad 2nd and 3rd harmonics are from the mistakes in the design. Please advice how to set it more symmetric?
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regards, Pawel |
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28th January 2011, 12:56 PM
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#4 |
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diyAudio Member
Join Date: Mar 2004
Location: Krakow
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simplified version
...
again not too good... 
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regards, Pawel |
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31st January 2011, 08:23 AM
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#5 |
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diyAudio Member
Join Date: Mar 2004
Location: Krakow
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it looks like input tripple clips the signal at 4V.
it is linear but clips... how to improve its headroom?
__________________
regards, Pawel |
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31st January 2011, 09:03 AM
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#6 |
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Banned
Join Date: Oct 2010
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Hi,
maybe you should pay a visit to: Cascoding the folded cascode That`s a much better topology despite some flaws. |
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7th December 2011, 12:31 PM
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#7 |
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diyAudio Member
Join Date: Mar 2004
Location: Krakow
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Hi
after some time I designed something like this. As input fet I am going to use BF245B but did not have the models. The design seems to be a bit from the oscillations please suggest how to make it more stable.
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regards, Pawel |
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7th December 2011, 12:34 PM
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#8 |
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diyAudio Member
Join Date: Mar 2004
Location: Krakow
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and asc file for ltspice
__________________
regards, Pawel |
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