maupenas said:
You don't know me.
You don't know how many years of experience I have.
I always lived with gear all around me, and good systems.
Why?
Let's say it's family business.😉
I don't remember how young I started fiddling with electronics, but I do remember calibrating (inside) tape recorders for the tapes I used (TDK SA-X) at the age of 10.
This was ~1980.
Too many things have happened since then, and no, a simple power op-amp chip is not a start, neither an arrival.
If you don't know me, how can you judge my experience?
Just because I can make a chipamp playing like many high-end amps 🙂att'n: ), which is very different from your experience?
Look, my father left making tube amps when you started learning about them.
I did grab these chips because I figured out since the beginning that they have lots of potential.
Yes, and for many many years I do listen to the best, when I want.
My "standards" are high, I'm used to listen to and compare with very good things, I'm not satisfied making a better amp than a Nad or a Rotel or a Denon or a Sony or...
Upupa Epops said:
Yes.
But don't tell me that STKs are better than LM or even OPA chips.
Too much theory and preconceptions there.
carlosfm said:
In the paper some STKs look very good and better then LM3886, for example.
In real live, I can not judge and I have one STK(rubbish STK) amp. I never have listen a good STK amp but I have listen to a great LMxxxx amp(Jeff Rowland concerto).
but this it's a complete different league of my Pioneer STK amp, so, I can't compare it 🙄
Since we are speaking of discrete amp, chip amp and scientific data. There's a few chip's that have better scientific data that many great discrete amps, but when you listen to them, it's a complete different history.
So, I not try the snubber ?
I am very sceptic about HIFI because normally everyone tells that what they do or have sounds great and are the best… but in the end, sometimes it's rubbish!
A few weeks ago I decided to try the snubber. Why not give it a try, I ask my self.
I was always in mind that it could just be another “psychological modification”.
In the end I got surprised, the snubber really works and is not a myth.
Once again I did not fallow the scientific way even knowing that this was raising the ESR of my PSU.
carlos,
Didn't really have anything to do with all that stuff, the hypex class-d amps sort of happened to fly by and i decided to go down that road.
However, now that my own amps are finished i'm stripping one of my clones to make an amp for my sister. Guess i'll have a lot of reading-up to do 😉
Didn't really have anything to do with all that stuff, the hypex class-d amps sort of happened to fly by and i decided to go down that road.
However, now that my own amps are finished i'm stripping one of my clones to make an amp for my sister. Guess i'll have a lot of reading-up to do 😉
Carlos,
Let's back to the PS topic. I had tried snuberized MK2 over my 25W LM3875 and I am now very pleased with the result.
Now, getting more greedy 😀
I saw your post (somewhere) that having 10,000UF on chip is not good. I know very litt;e about thetheory, Could you explain more why should not do so? Will it hurt the chip or sound bad?
confused:
Thanks!
Let's back to the PS topic. I had tried snuberized MK2 over my 25W LM3875 and I am now very pleased with the result.
Now, getting more greedy 😀
I saw your post (somewhere) that having 10,000UF on chip is not good. I know very litt;e about thetheory, Could you explain more why should not do so? Will it hurt the chip or sound bad?
confused:
Thanks!
loong said:
I didn't say that.
What I said is that unsnubberized it sounds bad.
That cap can be on the chip, but some bypassing on the pins is needed too, because the cap is big and will not be positioned as near as ideal.
It can all be done on a single board, but snubberized.
Otherwise the midband and treble start to be affected at around 2,000uf and up.
Some could be already satisfied with that kind of sound, but I'm not.
It's a question of: have you heard better?😉
carlosfm said:
Will the use of 10,000UF on chip create a huge current ripple and harm the chip?
I think that with 10,000uF near the chip you will lose some clarity in the mid and high rage 😉
Don't forget to add 100nF capacitor after the big one 😎
Don't forget to add 100nF capacitor after the big one 😎
XELB said:
How about (10,000 + 470 + 0.1) snubbrized per rail closely on chip (e.g. all mount on the Brian's board?
😉
I think that Carlos tried to explain that due to the large physical size of a 10K cap, you can't get it that close to the pins of the chip. Hence the arrangement of the snubbered PSU. 😉
XELB said:
Just share my experience between STK and LM3875.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=56077&pagenumber=4
Nuuk said:
Nuuk, thanks for the explaination. You're right the 10K cap is too big. The smaller one I have is only Elna standard 2,200UF on my stock now -__-"
( Actually I am reading your web pages now )
😉
Reading the last 30 posts got me all snubbered in the head, if i wanna do a LM3886 and a PSU (each on it's own board) is the recommendation to have:
This on the PSU board and then snubber+2200uF+100nF & 300nF on the chip board? or is the snubber on the schematics the one recommended on the chipboard (as in the text on the schematics).
Asking because it says 2W in the sch. and 1W in the text
🙂
This on the PSU board and then snubber+2200uF+100nF & 300nF on the chip board? or is the snubber on the schematics the one recommended on the chipboard (as in the text on the schematics).
Asking because it says 2W in the sch. and 1W in the text
🙂
tobias_svensk said:
How can I make it more clear?😕
2W resistors on the PSU.
1W resistors on each 2,200uf cap on each PSU rail, on each chip.
Clear?
No?
😀
The dissipated power in the resistors is _very_ small, microwatts, milliwatts so 0.6 W metall film and up will do.... is what I think.
Carlos, I still can't understand why you have the C7, C8 becuase you form a resonance circuit with those and C3-C6. What happens if you loose C7, C8?
Carlos, I still can't understand why you have the C7, C8 becuase you form a resonance circuit with those and C3-C6. What happens if you loose C7, C8?
And whatabout paint all device by garlic paste ? It is good against electronic vampire, which make often bad sound. 😀
crossed wires
I tried garlic, it does work, but my wife opposed because of the smell.
Now I just cross the wires of all components before I solder them together. It looks nice, keeps the vampires away and sounds a lot better.
I tried garlic, it does work, but my wife opposed because of the smell.
Now I just cross the wires of all components before I solder them together. It looks nice, keeps the vampires away and sounds a lot better.
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