X-Calibre : Hot Rodding Mauro Penasa's LM3886 design - Page 8 - diyAudio
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Old 8th December 2005, 07:54 PM   #71
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Hey Carlos

exactly the ranting and raving i was talking about. at least you add flavour to everything
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Old 8th December 2005, 08:28 PM   #72
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Quote:
Originally posted by rudi
Hey Carlos

exactly the ranting and raving i was talking about. at least you add flavour to everything
You tried the snubber, right?
You liked it, right?
Mmmm... maybe I'm not so lunatic as some may think.

Why did I say that this amp needed snubbers on those big caps?
Did I even needed to build it and try it?
No.
Why? Because I've been there, done that.
Do you believe me?
Whatever.
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Old 8th December 2005, 08:33 PM   #73
lazyfly is offline lazyfly  Australia
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Quote:
Originally posted by carlosfm


You tried the snubber, right?
You liked it, right?
Mmmm... maybe I'm not so lunatic as some may think.

Whatever.
Wait, which amp are we talking about here, Rudi's new 'version' or the original revisions? There were mixed results with the original if memory serves. Yeah I know, try it before commenting, so I'm not commenting on whether it enhances anything, just which version of the amp we're talking about.

Carlos, even if your deemed a lunatic no one can take your passion away so you'd be a passionate lunatic

Cheers
Kendal
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Old 8th December 2005, 09:03 PM   #74
DcibeL is offline DcibeL  Canada
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I don't really understand all this talk about whether the subber should be there or not. Everyone has their own tastes, and the parts for the snubber aren't expensive or anything so what's the harm in trying it out and listening for yourself and deciding what you like best. I don't believe there is any right or wrong here, just personal preference. Why should we as a group have to come to a conclusion of what is better. It's your amp, do what you like with it.

Good work on your X-calibre amplifier Rudi. I really like the idea of a regulated supply for the op-amps. I see you've gone with a single relay for each channel. Is there any reason to do this instead of a double pole relay (is that the right term)? Or was it just easier to design the PCB this way?
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Old 8th December 2005, 09:15 PM   #75
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Quote:
Originally posted by lazyfly
Wait, which amp are we talking about here, Rudi's new 'version' or the original revisions?
I'm talking about my experience with these chips, I've done and tested many things with them.

Quote:
Originally posted by lazyfly
There were mixed results with the original if memory serves.
Nobody tested my last PSUs with this amp. It would not be practical, anyway.

Quote:
Originally posted by lazyfly
Carlos, even if your deemed a lunatic no one can take your passion away so you'd be a passionate lunatic
Ok, then.
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Old 9th December 2005, 06:07 AM   #76
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Well there seems to be sour grapes in the twisted pear camp.


Well letís put some explanations and some apologies were it is due
1. Mauro. Not for one moment did I claim the amp design as my own. I have always given you credit for the schematic and the ingenious thought of implementation. And I thank you for you that
2. Hot Roding is a term to personalize something to your own tastes. In most case upping power or performance. In this case making a different power supply stage
3. My reference to this being commercial. From the beginning Russ stated that they are not doing it for a profit. I own my own business and not for one moment did the math indicate a profit. The point I am trying to make is that there only seem to be help to the people that build the TP version and it is ONLY about the TP version and if there is a small variation there were no support for this.
4. The X-Calibre is my development just as the current TP Ref C is a Russ White development, (by the sound of it with help from Mauro.), But I did mention that it is done according to Mauro design. Again giving him credit for the Amp part of the design.
5. There have been a lot of questions regarding the tweaking of this amp and I just wanted to satisfy the curiosity, and it actually worked. And it works extremely well.
6. The amp that I have originally implemented does clip, I started of by just mentioning it and there were no help to solve the problem or just a speculation of possible problem. If it were a TP board there would have been A LOT defence and immediate help. So the question is why does it clip so harshly when it gets to its limits. The reality is that I have a 9m x 6.5m x 3.2m listening room. It takes a lot of power to fill that room. And the ref-c is most probably not the amp to fill this space. I am already looking a locally amp that will give me 250w and can drive to 1.2 ohm, so no fear in me pursuing this variation, I will keep it strictly DIY. Just as a matter of interest. I tested the X last night and it got to 56W at 8ohm, then it became totally unstable, not just the normal clipping, I did not test it into 4 ohm

To bring me to the public apology.

Guys I am very sorry that I have pushed Mauro over the edge and robbed you of your new amp project.
I am sorry if I have offended anybody with any of my wild statement. I is my personality to get people to take initiative and to push them a bit
I am sorry if I took a condemning tone. It was uncalled for.
The TP is most probably a fantastic amp and I have never compared it to a X so to say that it will eat if for breakfast is very unfair. But it has been done in innocent competitive spirit.

Lets face the facts.

Musical fidelity came up with the topology. Then Mauro adapted it and implemented a more technical version by removing the mosfets and replacing them with a Lm3886 and documenting it in a fantastic way, I took that again and just implemented some known practices on the power supply.
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Old 9th December 2005, 06:13 AM   #77
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Quote:
Originally posted by carlosfm


You tried the snubber, right?
You liked it, right?
Mmmm... maybe I'm not so lunatic as some may think.

Why did I say that this amp needed snubbers on those big caps?
Did I even needed to build it and try it?
No.
Why? Because I've been there, done that.
Do you believe me?
Whatever.
Hi Carlos. I have tried them according to your latest supply and it does give it alot more life.

very much worth the little effort that it took to implement
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Old 10th December 2005, 06:48 AM   #78
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After an unfortunate debate I am withdrawing my efforts from this forum out of respect for the designer. I did not realise that even to post the design i needed his permision

Feel free to contact me directly if you want my view regarding this alternative layout.

My personal opinion is that it sounds extremely good. the layout as is, does work and i have 2 of these running

If anybody would like to make the tweakers board available you have my full permission to do so but please ask Mauro if he has any objections

The Sprague caps that i had available, i will sell wholesale.
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Old 10th December 2005, 01:19 PM   #79
float is offline float  England
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I for one am disappointed this little development has caused such a ruckus.

Ironically it was Rudi's enthusiasm for Mauro's amp that made me take the plunge - and I'm glad I did.

I hope you can still post your opinions of any mods you make to the basic design - even if they aren't improvements
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Old 10th December 2005, 03:21 PM   #80
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i would just like to say something and that is if i came up with a design and someone else made it better, called it something else and said their modded version of my amp could eat the unmodded version for breakfast i wouldnt take so much offense i would probly build the modded version for having better sound and thank the modder for posting the mods but thats just me
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