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Old 22nd October 2010, 06:24 PM   #201
qusp is offline qusp  Australia
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as mentioned, the XO would be an external digital one with no XO at all in the monitor. the only electronic components would be the amps in a shielded enclosure at the bottom and another plate amp for the low bass (a separate speaker), in this setup I would either be using 2 balanced F5s plus eventually a plate amp for a separate low bass (not needed in my room as yet), or more likely some other lower powered amp for the highs, the F5 for the bass and mids and plate amp for low bass. any way I do it would involve the XO being external, so not a stretch to do the whole think creatively mounted close by externally.

any further on the subject should probably be done elsewhere though, although I suppose its vaguely on topic

still food for thought though and i'll take it under advisement.

cheers

Last edited by qusp; 22nd October 2010 at 06:28 PM.
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Old 22nd October 2010, 06:48 PM   #202
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Mf 135 151 reaches almost the size given by Nelson in the F5 pdf.
Not fo twice that dissipation, i presume.
I fear Conrad to be optimistic.
In my concern, I will use twice 400mm x 140mm x 80mm.

Last edited by bobodioulasso; 22nd October 2010 at 06:51 PM.
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Old 22nd October 2010, 06:56 PM   #203
NYCOne is offline NYCOne  United States
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I realize the goal of the thread is to build the amp Patrick outlined in his XF5 posts. Is there a chance we can also try a set of the IRFP devices? That's been my question all along.

I just got pricing for the Toshiba output devices and the number is $112 for a matched set of 8. In contrast, a matched set of IRFPs is ~$24. The ~$90 difference doesn't make of break the project from me, but it adds up if you're building more than one (as I hope to).
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Old 22nd October 2010, 07:26 PM   #204
EUVL is offline EUVL  Europe
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You can download the Natsink Demo version to play around with if you wish.

NatSink

There are enough people who bought Conrad MF35-151.
Maybe someone can do a measurement by heating it with 130W and see what dT you get ?


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Old 22nd October 2010, 07:27 PM   #205
flg is offline flg  United States
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I just did. Thank you for reminding me. I would even give it a Thumbs up but
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Old 22nd October 2010, 07:47 PM   #206
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I have 4 conrad mf35-151 heatsinks on hand that I could probably test for temperature-rise if people are interested.

I might be able to do noise measurements of the resistors. I will see what I can do

Last edited by Melon Head; 22nd October 2010 at 07:52 PM.
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Old 22nd October 2010, 07:51 PM   #207
Horio is offline Horio  United States
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Quote:
Originally Posted by thanh1973 View Post
I have 4 conrad mf35-151 heatsinks on hand that I could probably test for temperature-rise if people are interested.
I think it would be wise test the conrad, if you have the sinks and equipment to do it. Would be a big hitch in the plan if their dissipation capability was overrated.
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Old 22nd October 2010, 08:06 PM   #208
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Quote:
Originally Posted by EUVL View Post
I find your remarks unfair.
I think what you're saying is that there is history to support the decisions you made as well as a place to openly discuss. That is fair, I didn't consider that aspect.

Honestly, and this is my $0.02, but there is enough information out there to make the F5X. I did it. I also contacted you and you answered all my questions and were very helpful. The point is, sometimes having "just enough information" allows one to learn more than having "all the information". I think you would agree with this.

I have projects built that I know for a fact only one or two more builds are out there in existence. Why aren't there more? Was the designer not clear and was there lack of solid documentation? Nope. And this brings us to the other side of the coin, and it is this side where I'd argue there is value to the pre-built modules. The greater amount of work that is done and the more plug-and-play, the greater exposure you will get. Why do you think there are so many chipamps out there being built?

One coin, two sides
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Old 22nd October 2010, 08:06 PM   #209
EUVL is offline EUVL  Europe
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> I think it would be wise test the conrad

I would agree with that.
Do bear this in mind, larger heatsinks means even higher cost for the enclosures.

Patrick
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Old 22nd October 2010, 08:09 PM   #210
EUVL is offline EUVL  Europe
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I am not really interested in how many people would own an F5X (or the DAO headphone amp, or my 2-stage Mosfet Circlotron, for that matter).
I know how good they sound, and so do people who built them.

I am only interested in how many would build them for themselves and in the process learn something about audio electronics.

That is where we differ. And I stick to my own ideals.


Patrick
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