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 😎
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 😎
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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.
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.
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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).
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).
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
I might be able to do noise measurements of the resistors. I will see what I can do
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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.
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 🙂
> 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
I would agree with that.
Do bear this in mind, larger heatsinks means even higher cost for the enclosures.
Patrick
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
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
Conrad's ratings are fiction. I'll give you guys a hint:
Conrad Heatsinks - Technical Details
Perhaps Fischer/Austerlitz/Seifert or Ferraz Shawmut?
Conrad Heatsinks - Technical Details
Perhaps Fischer/Austerlitz/Seifert or Ferraz Shawmut?
Fair. Then don't offer boards. People will learn more if they have to make their own PCBs or point-to-point the design.
If you get 4 PMs everyday asking you to sell them F5X boards, there comes a time when it is less hassle to make it available than to turn down all these requests in a diplomatic manner.
Everyone here knows how long I have resisted making the PCB available. Years !!
If you want to help, please try to propose something more constructive.
> I also contacted you and you answered all my questions and were very helpful.
The least you can do is to say thank you.
Patrick
Everyone here knows how long I have resisted making the PCB available. Years !!
If you want to help, please try to propose something more constructive.
> I also contacted you and you answered all my questions and were very helpful.
The least you can do is to say thank you.
Patrick
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> Conrad's ratings are fiction. I'll give you guys a hint:
The correction factor for 35°C rise has already been taken into account.
But a test is the only reality.
And I am sure thanh is going to do that. My most sincere thanks to him.
Patrick
The correction factor for 35°C rise has already been taken into account.
But a test is the only reality.
And I am sure thanh is going to do that. My most sincere thanks to him.
Patrick
I don't think Euvl is out to win a popularity competition.
For me populating a pcb is very easy.
The hardest part or at least most time consuming part is building a chassis, tapping and drilling holes, wiring, and mounting all of the hardware on the back plate, and have it look respectable enough that the wife won't mistake it for a piece of junk, and throw it in the bin.
Many of your have PMed me to offer help. My sincere thanks to all.
I can use with all the help I can get to reduce my work load. But we are doing fine right now. We need to get the Gerber files done, and I need to get realistic pricing for the chassis. When both of these are settled, I shall publish a BoM. And then I am sure you will organise yourselves for GBs and what not.
I already have one volunteer to build the first proto and post his experience. I might have another more experience DIYer to do the same in parallel. Then he could help me to answer some of the more technical questions.
Some of these takes time, so please be patient.
Patrick
thanh,
Shipment cost of Conrad sinks to HK is critical.
Please kindly check with them.
Worst case we have to ship sinks direct to the end user.
.
I can use with all the help I can get to reduce my work load. But we are doing fine right now. We need to get the Gerber files done, and I need to get realistic pricing for the chassis. When both of these are settled, I shall publish a BoM. And then I am sure you will organise yourselves for GBs and what not.
I already have one volunteer to build the first proto and post his experience. I might have another more experience DIYer to do the same in parallel. Then he could help me to answer some of the more technical questions.
Some of these takes time, so please be patient.
Patrick
thanh,
Shipment cost of Conrad sinks to HK is critical.
Please kindly check with them.
Worst case we have to ship sinks direct to the end user.
.
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The only other option I would add is
Option 3a: Monoblock - Beautiful and expensive
Option 3b: Monoblock - Cheap and nasty.
That might have to be for another time. I suppose two of option 1 or 2 could be suitable for monoblocks.
In your case, Thanh, you'll need a rubber foot under the transformer.
Patrick,
Which precision for the feedback resistors?
Patrick,
Which precision for the feedback resistors?
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Yes a rubber foot is a good idea.
With the JLH cases I am buiding, the transformers are housed in there own separate cases.
With the JLH cases I am buiding, the transformers are housed in there own separate cases.
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