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Old 23rd April 2013, 04:00 AM   #1
Bonsai is offline Bonsai  Taiwan
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Default IC's get hammered

I was doing some research as part of the work on my new pre-amp, which uses a modular gain stage design (both IC version and discrete version using LSK389).

My main reason for the modular gain stage approach is to be able to drive heavy loads (600 Ohms) fully in class A up to 10 V pk output, in amongst a few other things.

Anyway, I came across this and thought I'd share it.

Low Quality Components = Tasteless music
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Old 23rd April 2013, 04:03 AM   #2
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Looks like total nonsense to me
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Old 23rd April 2013, 04:06 AM   #3
jcx is offline jcx  United States
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read http://www.ti.com/lit/ds/symlink/tpa6120a2.pdf and laugh at Burson's pretension, ignorance

graphs show one channel driving 600 Ohms to 12 Vpk with < 2 ppm distortion, 64 Ohms, up to same level @ < 6 ppm - all with the nominal Class AB output


you can parallel the 2 channels in the package with a offset V, 1 Ohm current sharing resistors for Class A push-pull

I did it with >200 mA Class A bias

even a young college kid who swore he could tell op amp swaps "by ear" in blind tests couldn't tell when the Class A bias offset was turned on or off in my TPA6120 multiloop headphone amp

Last edited by jcx; 23rd April 2013 at 04:32 AM.
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Old 23rd April 2013, 04:07 AM   #4
qusp is offline qusp  Australia
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burson are known for speaking nonsense on this issue and 'their' discrete regs and opamps are not exactly known for their high performance by discrete standards. they are forever posting ridiculous, biased so-called research and technical results on their pages
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Old 23rd April 2013, 05:07 AM   #5
Bonsai is offline Bonsai  Taiwan
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Yes, I agree with all your statements. I think they know exactly what they are doing . . . and they get away with it because their target customers are ignorant.

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Old 23rd April 2013, 09:12 AM   #6
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why is anyone surprised? it's all over the web nowadays.

IMO the real issue is the fact that some people believe them simply because they like the 'concept'. "pure parts", "custom design" etc. just look on this website, people hear night and day differences between resistor brands when even complete amps are many times not very different when compared side to side. so I guess the guys actually own some market...

and, again, it's the same symptom: pseudo-objective explanations by subjectivists. look at the comments about EMI. geez, I wonder how come my mobile phone works, being full of ICs and working at almost GHz ranges. but have you looked at their discrete stuff? I'll show it to you. no physically close parts or anything like that.
oh, and you can bet the IC makers have no idea what EMI/RFI or coupled noise is. and sure as hell they don't care about it, because none of them actually make ICs designed to be used in precision applications.
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Old 23rd April 2013, 09:56 AM   #7
DF96 is offline DF96  England
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In order to sell a solution, first you have to create the perception of a problem.

To sell medicine/vitamins etc., convince healthy people that they are ill.
To sell cosmetics, convince beautiful women that they are ugly.

Then, to keep them, convince your customers that they are wiser/better/richer people than the foolish/jealous/ignorant/poor critics who scoff.
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Old 23rd April 2013, 10:41 AM   #8
FoMoCo is offline FoMoCo  United States
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Quote:
Originally Posted by DF96 View Post
In order to sell a solution, first you have to create the perception of a problem.

To sell medicine/vitamins etc., convince healthy people that they are ill.
To sell cosmetics, convince beautiful women that they are ugly.

Then, to keep them, convince your customers that they are wiser/better/richer people than the foolish/jealous/ignorant/poor critics who scoff.
You just hit the nail on the head. Same thoughts as mine, just said better.
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Old 23rd April 2013, 12:08 PM   #9
marce is offline marce  United Kingdom
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Notice they dont have products they have creations!!!!!!!!!!!!!!!!!
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Old 23rd April 2013, 12:22 PM   #10
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the Burson discrete regulator:
Superpower Super Regulator by Belleson

worse than a 7805 at ripple rejection. and looks like for some reason the Burson NASA-level scientists reached the conclusion that horrendous transient performance is a must for good sound.

funniest thing of all is that in a completely subjective shootout done by some local audiophiles their DAC came out as one of the worst sounding.

what beats me is... why not simply market your products as good sounding and be done with it? why resort to such ridiculous statements like the ones about EMI? anyone wanna bet that their products are worse EMI-wise compared to standard ICs?

PS: the banner just above this edit box has a Burson ad LOL
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