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Old 22nd October 2010, 12:51 PM   #191
EUVL is offline EUVL  Europe
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Those "modules" are for people who do not want to learn / understand electronics and not want to pay money for hi-end gear.
Nothing wrong, but if that is what you want, this is probably not the right place, and I am certainly not the right guy for you.

And I have no respect for people who sells standard datasheet implementations.

As much as time allows, I shall try to teach you skills to find food.
I certainly won't spoon feed you. And I bet neither does Nelson.

I mean you generally, not Marc or any specific person.


Patrick

Last edited by EUVL; 22nd October 2010 at 12:54 PM.
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Old 22nd October 2010, 01:06 PM   #192
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point taken, but you're providing a list of suggested brands for parts, then there is the matched FETs, matched JFETs and corresponding resistors, a PCB, a chassis. What's the skill you're teaching again?

I think the answer is how to identify the hard-core DIYers around here who know what they're doing and are imitation worthy. Nothing wrong with that, I have a list of people that I stalk around here and honestly that's the best way to consume information on this site.

Anyways, so what's left but to solder the thing? The nice thing about the module is at least someone would be doing testing and verification after it's built, something that should be done more often around here.
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Old 22nd October 2010, 04:43 PM   #193
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Is there not a contradiction between square PCB, good for heat spreading in tower monobloks, and the choice of a linear chassis using MF35-151? (Which look to me on the small side for the job)
Or did i miss something?
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Old 22nd October 2010, 05:22 PM   #194
qusp is offline qusp  Australia
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Quote:
Originally Posted by luvdunhill View Post
Without fail you'll get a performance benefit from removing the amp (and the crossover) from a speaker enclosure. Too many components that are either microphonic or interact with each other to end up with a low distortion product.
by in the same enclosure, I mean at the bottom of a tower/stand so that the massive weight of the sinks etc also serves as damping (along with a ton of sand or other anchoring weight). the ATC studio actives are simply some of the best sounding speakers of any sort that I have heard (not that I have heard a massive variety of gear other than at meets) and I am trying to emulate that. surely there is also something to be gained from lowering the distance as well as the accompanying inductance? XO will be external digital, fed by the upcoming 8 channel ackodac and a mac mini running logic pro and RME multichannel IO .

i'm on the lookout for some ATC studio line bass and mid drivers too, they pop up from time to time. not sure on the tweets yet

point taken though

Last edited by qusp; 22nd October 2010 at 05:24 PM.
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Old 22nd October 2010, 05:24 PM   #195
EUVL is offline EUVL  Europe
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Marc,

I find your remarks unfair.

You can find enough posts here from me and on the F5 thread which explain in detail the reasoning behind my choice of components (e.g. why Toshiba MOSFETs, why 5R degeneration for the 2SJ74,.... etc. supported by measurement data) and circuit setting (like rail voltage and current, and why they are so chosen). I also explained how you use the symmetry to cancel even harmonics, how you can do even better trade-offs in the F5X which has two axes of symmetry...., etc.

Just as Nelson always explain the principle of his circuits in detail and not just give you a schematics, a BoM, and a Gerber file.

Do you get any of the above from the other place, where you paid the money and get a fully finished PCB just to wire power supplies and fancy housings to ?
For me that is not the type of DIY I want to support. Personal choice, to which I have the right.

You can ignore all these theoretical stuff, and wait for the final results and copy & paste. Fine with me if that is what you want. I cannot force you to learn. You can also buy a fully finished product where all the trimming is done for you -- there is one available much better than anything I can / will do --the FW F5.

You can choose to follow the theories (and there is one person here who does that intensively for the last 2 months, helping me to do spice simulation when I have no time, and making comparisons to different measurement methods, etc, and publishing them), and you might eventually learn enough to be able to design your own circuits. Or at least you understand the circuit enough so that you can debug them yourselves and not scream for help with the first thing that goes wrong.

Your choice, and you have the right to.

And I want to say openly, thank you Dave for doing all the donkey work for me .....


Regards,
Patrick

Last edited by EUVL; 22nd October 2010 at 05:40 PM.
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Old 22nd October 2010, 05:28 PM   #196
ecir38 is offline ecir38  United States
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Well said, glad to have been following this thread since the beginning.

Brad
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Old 22nd October 2010, 05:30 PM   #197
EUVL is offline EUVL  Europe
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> Too many components that are either microphonic or interact with each other to end up with a low distortion product.

He is right.

Put your hand on a sand filled bookshelf speaker stand playing heavy metal and see for yourself how much vibration you still get. I do not want to put my electronic circuit there. In fact, I put my passive crossover outside the speaker enclosure these days.


Patrick
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Old 22nd October 2010, 05:36 PM   #198
EUVL is offline EUVL  Europe
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> Is there not a contradiction between square PCB, good for heat spreading in tower monobloks, and the choice of a linear chassis using MF35-151?

Yes, there is. And this is why I use tower monoblocks.

The chioce of the Conrad heatsink is cost.
2 of my mini-towers would cost 2.5~3x to make of that one of our proposed housing would cost you.

You can of course design a long and narrow PCB to suit the enclosure.
Please feel free to do so. I just offer what I have off hand without another 20 hours of work.

With a back plate of about 10mm of the Conrad, the difference in the end is about 5°C non-uniform temperature over the heatsink, or in other words 5°C higher temperature at the MOSFET.

Perfection always comes at a price.


Patrick
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Old 22nd October 2010, 05:44 PM   #199
EUVL is offline EUVL  Europe
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> Well said, glad to have been following this thread since the beginning.

I encourage you to give your rating for this thread.
Just click on the top right of the page, where the stars are.


Patrick
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Old 22nd October 2010, 06:12 PM   #200
EUVL is offline EUVL  Europe
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> As for the Conrad MF35-151, it will dissipate 130W at 3°C temperature rise (above ambient).

Typing mistake, I meant 35°C.


Patrick
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