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Old 13th December 2010, 06:24 PM   #11
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Quote:
Originally Posted by ostripper View Post
... let's move on to the application(s).

OS
Hi Ostripper
all of the famous designs might be fix/improve in this way
I can see next generation "old" amps with TMC,
could ZEN amp use this type feedback?
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Old 13th December 2010, 09:32 PM   #12
Krisfr is offline Krisfr  United States
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I want to see what it does to OS's LX amp... LXTMC with a separate front end power supply...
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Old 13th December 2010, 10:35 PM   #13
Bonsai is offline Bonsai  Taiwan
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I have simmed a Fully Balanced Symmetrical (FBS) design with TMC and also FET c. 15dB reduction in distortion. Component values were not optimized. However with FBS topologies you need 4 caps and 2 resistors which single ended designs like the Blameless do not need - 2 caps and a resistor do the trick. I will definitely use this technique on my new designs. This is actually a really great breakthrough in class AB amplifier design.
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Old 13th December 2010, 10:36 PM   #14
WuYit is offline WuYit  Sweden
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ostripper,
I`ve downloaded GX1.2VB_final, as a matter of fact, it´s not that bad.
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Old 13th December 2010, 10:41 PM   #15
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Bonsai View Post
I have summed a Fully Balanced Symmetrical (FBS) design with TMC and also FET c. 15dB reduction in distortion. Compcalyes were not optimized. However with FBS topologies you need 4 caps and 2 resistors which single ended designs like the Blameless do not need.
Also using a fully symetric..
No special caps, but a badly enhanced VAS
with about 100db gain at DC, plus another 30 db
for the input differentials...
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Old 14th December 2010, 12:00 AM   #16
godfrey is offline godfrey  South Africa
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Seems to me that TMC can be improved by using a multi-pole transition.

I'm not sure it's worth the extra R and C, but in another thread I noticed a lot of scorn being heaped on a TMC implementation with equal value capacitors, so I figured anyone who get's that upset about losing 4 or 5 dB loop gain may be interested in gaining an extra 20 or so...
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Old 14th December 2010, 12:17 AM   #17
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Originally Posted by padamiecki View Post
......I can see next generation "old" amps with TMC.....
A BAKSA-TMC is alive
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Old 14th December 2010, 12:28 AM   #18
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Default Numbers really improve....we must discover is how much this changes sonics

regards,

Carlos
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Old 14th December 2010, 08:57 AM   #19
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Default improvements

Quote:
Originally Posted by godfrey View Post
Seems to me that TMC can be improved by using a multi-pole transition.

I'm not sure it's worth the extra R and C, but in another thread I noticed a lot of scorn being heaped on a TMC implementation with equal value capacitors, so I figured anyone who get's that upset about losing 4 or 5 dB loop gain may be interested in gaining an extra 20 or so...
Hi Godfrey,

I suppose you are referring to me as the one who got 'upset' by that stupidity. Not only the distortion is two times higher with equal caps, but also the slew rate is degraded to half of its original value. Totally unacceptable, in particular from someone who should should have known better.
Anyhow, I'm sorry to say so, but your suggestion doesn't work, at least not in the that way. Nevertheless there is still room for improvement:

ETMC: Bob Cordell Interview: Negative Feedback
and here another implementation of ETMC: Bob Cordell Interview: Negative Feedback

TTPC: Bob Cordell Interview: Negative Feedback
and here an improved version of TTPC: Bob Cordell Interview: Negative Feedback
and here, for completeness, a version that does NOT work: Bob Cordell Interview: Negative Feedback

Cheers,
E.
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Old 14th December 2010, 11:07 AM   #20
PHEONIX is offline PHEONIX  Australia
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Originally Posted by destroyer X View Post
regards,

Carlos
Hello Carlos

If you take your design for example and you were able through drastically reduce the distortion it would sound a lot better, simple because it is not adding to the distortion of the input signal. Really low distortion can be heard over high distortion all things being equal (namely the amps are made of the same quality of components).

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Arthur
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