Peter Daniel said:
Are you still working on this, or have the ZV9 amps managed to cause a change in your plans?
Do you have any more boards left? Any plans for another run?
I didn't complete AX, because of Zv9. But still have plans to work on it.
I'm out of A30 boards. If I can get interest in 25 pcs, can order them again.
I'm out of A30 boards. If I can get interest in 25 pcs, can order them again.
The A30 board part is now in Vendors Bazaar.
http://www.diyaudio.com/forums/showthread.php?goto=newpost&threadid=92577
The rest is split off to Texas where it can still be read by everyone. Despite the useful info, it was not worth starting a new thread for it.
http://www.diyaudio.com/forums/showthread.php?threadid=92579
/Hugo
http://www.diyaudio.com/forums/showthread.php?goto=newpost&threadid=92577
The rest is split off to Texas where it can still be read by everyone. Despite the useful info, it was not worth starting a new thread for it.
http://www.diyaudio.com/forums/showthread.php?threadid=92579
/Hugo
Aleph5 PCB
I found a pcb of Aleph5 at here:
[url]http://www.audiostereo.pl/forum_wpisy.html?temat=19667&p=21#k[/URL]
It looks very nice!! Does anybody know where is more infomation about the PCB?
I found a pcb of Aleph5 at here:
[url]http://www.audiostereo.pl/forum_wpisy.html?temat=19667&p=21#k[/URL]
It looks very nice!! Does anybody know where is more infomation about the PCB?
An externally hosted image should be here but it was not working when we last tested it.
Hello Peter Daniel
I'm very interested i 3 pairs of the boards Aleph30 is
there any possibillity that you soon will order more?
I'm sorry for my bad english.
I'm very interested i 3 pairs of the boards Aleph30 is
there any possibillity that you soon will order more?
I'm sorry for my bad english.
The boards are available, see this link for more details:
http://www.diyaudio.com/forums/showthread.php?s=&postid=1117842#post1117842
http://www.diyaudio.com/forums/showthread.php?s=&postid=1117842#post1117842
Re: Aleph5 PCB
These were part of a complete Aleph5 kits offered by an infamous Taiwan company once.
The DIY forum thread you referred to looks like a complete round up of all the DIY work that has happened on this site; BrianGT's boards, Peter Daniel's boards, etc. for the Aleph.
I'm trying to figure what country and language this is?
-David
xiaoao360 said:
These were part of a complete Aleph5 kits offered by an infamous Taiwan company once.
The DIY forum thread you referred to looks like a complete round up of all the DIY work that has happened on this site; BrianGT's boards, Peter Daniel's boards, etc. for the Aleph.
I'm trying to figure what country and language this is?
-David
Taj,
Do you plan to thermally link the 2 pieces? With the A30 board layout the devices are located differently on each one. It would be best to take steps to assure that all the devices are close to the same temperature.
So,if I were going to use them in that arrangement, I would consider a large plate common to all devices between the devices and the sinks. A thermal transfer is necessary, so match/mate the surfaces accordingly. HTH
Do you plan to thermally link the 2 pieces? With the A30 board layout the devices are located differently on each one. It would be best to take steps to assure that all the devices are close to the same temperature.
So,if I were going to use them in that arrangement, I would consider a large plate common to all devices between the devices and the sinks. A thermal transfer is necessary, so match/mate the surfaces accordingly. HTH
I did something similar here:
An externally hosted image should be here but it was not working when we last tested it.
Hi Brian,
Beautiful job!!!
What are the other boards, and are they also available to us?
Would you mind listing exactly what they are, and the sources where you purchased them? If they were from group buys or threads on the DIY site, would you mind listing where?
Once again, awesome job!
Thanks!
PS - Not trying to hijack Peter's thread, just would be nice to be able to source everything to build an amp at once and the power supply boards shown look interesting.
Beautiful job!!!
What are the other boards, and are they also available to us?
Would you mind listing exactly what they are, and the sources where you purchased them? If they were from group buys or threads on the DIY site, would you mind listing where?
Once again, awesome job!
Thanks!
PS - Not trying to hijack Peter's thread, just would be nice to be able to source everything to build an amp at once and the power supply boards shown look interesting.
Thanks!
The A30 boards are Peter's.
The power supply boards are from Brian Bell (aka BrianGT)(www.chipamp.com, www.diyamps.com) from the miniAleph project, available on his site I believe.
The other boards are are the Twisted X-BoSoZ from Twisted Pear Audio (Russ White and myself). The circuit was designed by Terry Aben (metalman).
The A30 boards are Peter's.
The power supply boards are from Brian Bell (aka BrianGT)(www.chipamp.com, www.diyamps.com) from the miniAleph project, available on his site I believe.
The other boards are are the Twisted X-BoSoZ from Twisted Pear Audio (Russ White and myself). The circuit was designed by Terry Aben (metalman).
Ed Lafontaine said:
I do now. Thanks! It's a lot more work, but I guess I'd better start looking for a giant heat spreader and 5 gallon bucket of thermal paste. 🙂
Nobody answered the dissipation question though.
..Todd
Nobody answered the dissipation question though
Hi,
The answer to this is not so simple. but I will give it a try.
First I typically test any piece of heatsink by increasing the dissipated power into the heatsink until I reach the desired heatsink temperature.
Then I determine the delta temp of the heatspreader. This is a function of the thikness of the material used and the the material itself. For an aluminium plate of 6mm (12 x 30cm) I calculated about 9C from the middle till each end @ 120W.
Then look at the insulation pad and heatsink compound. The thermal resistance typically is 0,05 till 0,3 degC/Watt.
Then look at the Thermal resistance from junction to base for the device you want to use. I use 0,9 degC/wat for IRFP devices in TO247 case.
So assume you want to dissipate 100W at a heatsing delta temp of 25 degreesC, you need a sink of 0,25degC/Watt. At a room temp of 25 deg, the sink will be 50C.
The heat spreader will be 60C
To make sure that the device does not fail after a short time, I calculate the maximum junction temp @ 100C.
The maximum dissipation per device is then (100-60)/(0,9 + 0,3)
or ~33Watt
So in this example you can use 3 devices per heatsink.
I hope this helps...Tarasque.
Hi,
The answer to this is not so simple. but I will give it a try.
First I typically test any piece of heatsink by increasing the dissipated power into the heatsink until I reach the desired heatsink temperature.
Then I determine the delta temp of the heatspreader. This is a function of the thikness of the material used and the the material itself. For an aluminium plate of 6mm (12 x 30cm) I calculated about 9C from the middle till each end @ 120W.
Then look at the insulation pad and heatsink compound. The thermal resistance typically is 0,05 till 0,3 degC/Watt.
Then look at the Thermal resistance from junction to base for the device you want to use. I use 0,9 degC/wat for IRFP devices in TO247 case.
So assume you want to dissipate 100W at a heatsing delta temp of 25 degreesC, you need a sink of 0,25degC/Watt. At a room temp of 25 deg, the sink will be 50C.
The heat spreader will be 60C
To make sure that the device does not fail after a short time, I calculate the maximum junction temp @ 100C.
The maximum dissipation per device is then (100-60)/(0,9 + 0,3)
or ~33Watt
So in this example you can use 3 devices per heatsink.
I hope this helps...Tarasque.
Re: Nobody answered the dissipation question though
Well I'd like to think it helped. I'll let you know after the pain killers kick in and smoke clears. I suspect I'll be just as confused then though. Not that I don't appreciate the response.
..Todd
Tarasque said:
Well I'd like to think it helped. I'll let you know after the pain killers kick in and smoke clears. I suspect I'll be just as confused then though. Not that I don't appreciate the response.
..Todd
Maybe I'll try a question with a lower ASA biasing requirement...
What rail voltage does the Aleph 30 require? I've seen mentions of +-16v, 18v and 20v transformers in the preceding messages. None of the BOMs mention it and the original manual doesn't mention it. (Unless I missed it somewhere - which is likely.) That's a spread of rail voltages of 18v - 28v or so. So I don't know what transformers to get.
..Todd
What rail voltage does the Aleph 30 require? I've seen mentions of +-16v, 18v and 20v transformers in the preceding messages. None of the BOMs mention it and the original manual doesn't mention it. (Unless I missed it somewhere - which is likely.) That's a spread of rail voltages of 18v - 28v or so. So I don't know what transformers to get.
..Todd
Aleph30 uses +/- 25V rails voltage.
With 500VA Plitron transformer and 120V AC mains, you will get exactly +/- 26.3V on rails in a working amplifier.
With 500VA Plitron transformer and 120V AC mains, you will get exactly +/- 26.3V on rails in a working amplifier.
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