Has anyone seen this front-end before? - Page 4

Edmond Stuart · 28th March 2012, 12:43 PM

Quote:

Originally Posted by bear

Dizzy. The music goes round and round...

Speaking of which, while I have all of you here looking at that schematic, might I request that you all take a look here, and lend a hand? There may be some similarities, but I am not sure:
Les Sage Amps
Regardless of similarity, the question is how does this one work?? It is alleged to have both sliding bias and also SOA protection of some sort. (post 44 and beyond have real schematics)

_-_-bear

Hi Bear,

I'm sorry to say so, but 'Les Sage Amps' is a totally different kettle of fish.

Cheers,
E.

homemodder · 28th March 2012, 01:08 PM

Its Alex, you should have my full name from the emails we exchanged some months back.

I based a design around the crossquad idea, problem is I get 20Khz openloop bandwith, unity close to 100 Mhz and 85 db loop gain. Linearity wise not great but 10ppm levels independant of amplitude and frequency till 50 khz is appealing. Feedforward can better this but trying for least complexity. I am on the same as this design of yours but ppb from the crossquad no way.

bear · 28th March 2012, 01:30 PM

Quote:

Originally Posted by Edmond Stuart

Hi Bear,

I'm sorry to say so, but 'Les Sage Amps' is a totally different kettle of fish.

Cheers,
E.

Sure, but if any of you would care to analyze and comment on them it would be appreciated.

_-_-bear

Edmond Stuart · 28th March 2012, 01:41 PM

Please don't do it here, but there where it belongs.
This thread is about the Super TIS. Don't pollute it.

Bonsai · 28th March 2012, 02:05 PM

Nice website you have Edmond. I will await your findings - should be interesting.

Edmond Stuart · 28th March 2012, 02:26 PM

Hi Bonsai,

Regrettably, my findings will be limited to the results of simulation. I'm a designer and not a builder (any more). So I hope that somebody else is willing to build and test this front-end (perhaps Ovidiu

)

Cheers,
E.

Bonsai · 28th March 2012, 03:23 PM

LOL! I won't volunteer - I am just too busy unfortunately.

Are you doing anything in Jan's magazine?

Edmond Stuart · 28th March 2012, 03:48 PM

Bonsai, you've a PM.

Edmond Stuart · 28th March 2012, 03:57 PM

BTW, Some comparisons with a few other front-ends:
PGP: complexity: 45 trannies, THD20k = 53ppb
Super TIS: complexity: 18 trannies, THD20k = 74ppb
Bob's HEC: complexity: 19 trannies, THD20k = 1057ppb

KSTR · 28th March 2012, 04:05 PM

Edmond, very clever circuit as far as I can judge. Me likes the input filter with the divided-down feedback from the output to get back down at the input level. Not many people know or use this trick with Sallen-Keys, let alone with capacitors...

28th March 2012, 01:41 PM	#34
Edmond Stuart diyAudio Member Join Date: Nov 2003 Location: Amsterdam	Please don't do it here, but there where it belongs. This thread is about the Super TIS. Don't pollute it. __________________ Een volk dat voor tirannen zwicht, zal meer dan lijf en goed verliezen dan dooft het licht…(H.M. van Randwijk)

28th March 2012, 02:05 PM	#35
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	Nice website you have Edmond. I will await your findings - should be interesting. __________________ bonsai Amplifier Design and Construction for MUSIC! http://hifisonix.com/

28th March 2012, 02:26 PM	#36
Edmond Stuart diyAudio Member Join Date: Nov 2003 Location: Amsterdam	Findings Hi Bonsai, Regrettably, my findings will be limited to the results of simulation. I'm a designer and not a builder (any more). So I hope that somebody else is willing to build and test this front-end (perhaps Ovidiu ) Cheers, E. __________________ Een volk dat voor tirannen zwicht, zal meer dan lijf en goed verliezen dan dooft het licht…(H.M. van Randwijk)

28th March 2012, 03:23 PM	#37
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	LOL! I won't volunteer - I am just too busy unfortunately. Are you doing anything in Jan's magazine? __________________ bonsai Amplifier Design and Construction for MUSIC! http://hifisonix.com/

28th March 2012, 03:48 PM	#38
Edmond Stuart diyAudio Member Join Date: Nov 2003 Location: Amsterdam	Bonsai, you've a PM. __________________ Een volk dat voor tirannen zwicht, zal meer dan lijf en goed verliezen dan dooft het licht…(H.M. van Randwijk)


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28th March 2012, 01:08 PM	#32
homemodder Account disabled at member's request Join Date: May 2006	Its Alex, you should have my full name from the emails we exchanged some months back. I based a design around the crossquad idea, problem is I get 20Khz openloop bandwith, unity close to 100 Mhz and 85 db loop gain. Linearity wise not great but 10ppm levels independant of amplitude and frequency till 50 khz is appealing. Feedforward can better this but trying for least complexity. I am on the same as this design of yours but ppb from the crossquad no way.

28th March 2012, 03:57 PM	#39
Edmond Stuart diyAudio Member Join Date: Nov 2003 Location: Amsterdam	BTW, Some comparisons with a few other front-ends: PGP: complexity: 45 trannies, THD20k = 53ppb Super TIS: complexity: 18 trannies, THD20k = 74ppb Bob's HEC: complexity: 19 trannies, THD20k = 1057ppb __________________ Een volk dat voor tirannen zwicht, zal meer dan lijf en goed verliezen dan dooft het licht…(H.M. van Randwijk)

28th March 2012, 04:05 PM	#40
KSTR diyAudio Member Join Date: Jul 2007 Location: Central Berlin, Germany	Edmond, very clever circuit as far as I can judge. Me likes the input filter with the divided-down feedback from the output to get back down at the input level. Not many people know or use this trick with Sallen-Keys, let alone with capacitors...

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