Decided on the Aleph 2, what psu should I build? - diyAudio
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Old 13th March 2014, 03:52 PM   #1
sibbeli is offline sibbeli  Sweden
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Default Decided on the Aleph 2, what psu should I build?

So, I have finally come to an conclusion, Iīll build the Aleph 2īs first, and then later i might try A-X or A-JX.

But, for now, Iīm contemplating on what type of PSU to use with the two mono Aleph 2īs.

CLC, CRC, CCRCC, CCLCC or even a Regulated PSU?

I have ordered 48pcs of 33,000uf big can (Computer Grade) capacitors, so I do have a lot of C to play with, as I might even order another 48 capacitors...


So, If you had all this capacitance, what kind of PSU would you have built?

Each monoblock could have 24x33,000uf as Iīll have 48pcs atleast.


I am familiar with what CLC and CRC are, but PSUs arenīt my strong side (nothing in ampīs are my strong side but anyways..)

I was thinking of a Regulated PSU, what benefits will a regulated PSU have over a CLC "Pi" filter?

And what benefits do a "Pi" PSU have over a CRC/CCRCC/ PSU?


This might be a god place to post info or links to info regarding Class A Power supplyīs as I havenīt seen so much info about Class A PSUs..

The info I find is mostly directed towards Class AB/B amps, and they arenīt my cup of tea, as I want the best possible, within reason, hence this thread..


Best Regards, Mathias
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Old 13th March 2014, 05:13 PM   #2
moe29 is offline moe29  United States
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On my Aleph 2 i have to start, 1,000VA (1kVA) toroid with 37v secondaries.

Feeding CLC of 68,000uF - 2mH - 68,000uF. (per rail)

If you can't find a large wire wound 2mH inductors - i'd look into a CRC - as seen in the
First Watt offerings.

pretty simple, and better yet, works
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Old 13th March 2014, 05:33 PM   #3
6L6 is offline 6L6  United States
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Regulated PSU that large will make s much heat as the amp - use CRC or CLC.

I suggest CRC for simplicity and performance, and use 8-10 of your capacitors per rail. Physical size constraints of you chassis will likely dictate how many caps you can use.

Also remember that you will need some kind of softstart circuit so you don't trip your circuit breaker or blow large fuses at power-on.
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Old 13th March 2014, 07:18 PM   #4
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whit a 1000VA ond THAT much capasistance. there is a real good chance of blowing the softstart too. been there, done that. i had too modify the softstart so it could handle 1000VA transformer and the cap bank of 6x68.000uF. the softstart resistors burned. and i had to use thermistors insted of resistors.
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Old 13th March 2014, 07:21 PM   #5
moe29 is offline moe29  United States
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I use a Thermistor after the switch - as seen in the Aleph 2 schematic.

No problems with circuit breaker or fuses...

i wonder at what amount of capacitance inrush becomes a problem?

-------

just comparing the Aleph 2 to the Aleph 3 schematic - surprising to see the A3 and A2
use the same amount of capacitance... neither uses CLC or CRC.
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Old 13th March 2014, 07:28 PM   #6
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its not the amount of capacistance alone. its the combination with the transformer.
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Old 13th March 2014, 07:29 PM   #7
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by AudioSan View Post
..... the softstart resistors burned. and i had to use thermistors insted of resistors.
and what I'm honking all these years ........... exactly that

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Old 13th March 2014, 07:43 PM   #8
moe29 is offline moe29  United States
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80,000 uF per rail is probably enough - seemed to service the production A2s fine...
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Old 14th March 2014, 02:03 PM   #9
sibbeli is offline sibbeli  Sweden
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Okey, thanks for the advices.

I'm going to use atleast 24pcs for the two monoblocks, that's 6 per rail, 198,000uf per rail. That seems to be some kind of middleway, as people seems to either use under 0,1f/rail or they go crazy and use up to 0,4f/rail. I have the possibility to go crazy with the
psu as i have loads of C, and I do have 15*0,386 c/w for my two monos, so I probably could go regulated, how would such a Regulated PSU look like? and what bemnefits will i get from going the regulated route?
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Old 14th March 2014, 02:10 PM   #10
sibbeli is offline sibbeli  Sweden
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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.
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