Decided on the Aleph 2, what psu should I build? - Page 2 - diyAudio
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Old 14th March 2014, 02:19 PM   #11
sibbeli is offline sibbeli  Sweden
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I forgot to mention that i have zero size constraints as i'm building the chassis myself, all aluminium. Just 6 of my sinks which will be placed 3 & 3 and form the sides of the chassis, wheight 26kg.. each sink measures 182w*300h*80d so the chassis will be around 550-600mm deep and 350-400mm height and the usual 19" width, something like that...
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Old 8th April 2014, 03:37 PM   #12
sibbeli is offline sibbeli  Sweden
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Hi,

Where can I find 2,2mH/2mH inductors today? I dont know whee to search for them since im in EU.

I can order from USA, but still, where do i find them, today and not costing me 1,198$ as thats what i have found untill now.. Thats the same ammount of money my monoblock will end up costing, roughly..


I would like to go the regulated route, but I think Ill go CLC for now, and later develop a regulated psu when I know more about reg. psus..

How much of a difference will CLC do against CRC? Is it worth it? I can build a CRC supply right now, parts easy to find, cheap etc... but will CLC reduce ripple noticable much more than CRC?

So, someone, help please?
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Old 8th April 2014, 03:43 PM   #13
6L6 is offline 6L6  United States
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Mathias,

CRC is certianly quiet, and works very, very well for that amplifier. I would suggest getting the diyAudi PSU board or something like it, and making the amplifier with the CRC first, making all the adjustments to the amp and making everything operational and quiet first.

If you want to try a regulated PSU, and with an Aleph will be quite beneficial as the PSRR of that circuit is lower than push-pull, it would be very interesting and worth the effort.

Check your PM.
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Old 8th April 2014, 11:53 PM   #14
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If you want to build an regulated PSU later, than why not do it right now?

All you have to know for a regulator is in the Article ZEN Variations Part3

I had made one fr my ACA, worked well but wasn`t so much power loss as in a A2. So things are much easyer and cheaper.

...all you need are much Transitors, a lot of heat sinks and you are on the way...
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Old 9th April 2014, 12:00 AM   #15
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...and really cheaper than 1,198$
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Old 9th April 2014, 07:21 AM   #16
JBL4435 is offline JBL4435  Germany
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Hi Sibbeli

I have huge Mundorf transformer core coils.
PM sent
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Old 20th May 2014, 10:28 PM   #17
jritota is offline jritota  United States
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Default A2 power supply

I've had no problem using 1 KVA 37V secondaries with 4-33k 68V and using 102C rated caps to handle the chassis heat. CRC network works perfect with wonder cap bypassing. The inrush thermistor starts the amps very nicely with no failure 4 years strong. Mr Pass did all the work already. Stick with no more than 132K per PS. Reg supply could be more trouble than $$ and time. Regulated supplies source line components is one thing. Massive sinks run 50C within one hour idle.
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Old 21st May 2014, 02:13 AM   #18
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Default Aleph 2 Schematics

Quote:
Originally Posted by sibbeli View Post
moe, can you please share your alephs schematics? I have only the aleph 2 user manual, and would really like to get hold of the service manual and schematics.

Either pm me, or email me if you cqn, my email is: mkronsellen @gmail.com

It would make me happy, if you could share them wih me.

May be you could try the JFet updated version of Aleph 2 that I build with the great help of some forum members (have a look to Help wanted: Jfet front-end for Aleph 2)

The changes are small, but the sound improvement was outstanding.

Attached you will find the A2J schema in jpg and pdf.

Regards,
Alejandro
Attached Images
File Type: jpg A2-Jfet-Inp-A14.jpg (178.5 KB, 108 views)
Attached Files
File Type: pdf A2-Jfet-Inp-A14-schema.pdf (91.2 KB, 39 views)
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