The Aleph-X

[Koy]

AX has symetric input. Most of players are euiped by asymetric output. Do you use any symetrising circuit for AX?

[grataku]

Koy
plan to use BOSOZ, straight up no CCS. Best sounding preamp I ever built.
I expect the pair will sing like a hummingbird.
Pass creations are extraordinary.

[grataku]

Brian
if you have a linux machine in the lab you could use

http://bach.ece.jhu.edu/~haceaton/pcb/

I have heard good things about it.

[hifiZen]

Didn't someone post a comparison with the Zen a few pages back? Carpenter, I think...

[hifiZen]

Here we go...

http://www.diyaudio.com/forums/showt...7186#post77186

[Faber]

This is my own PCB for Aleph-X :-)

That's my first Aleph design and also my first double-sided pcb design, I hope there are no mistakes in it.

To have traces and layout simmetrical, I will mount the Mosfets vertical on the PCB, they will be coupled with a screw to an alluminium angular attached to the heatsink.

Tell me what you think about.

This is the first side

Bye, Fabrizio

[Faber]

and this is the second side.
bye1
Fabrizio

[grataku]

Looks pretty good. I think you can safely get rid of the fuses there is no point in having them in SE class A. You would be putting a 10-15 Amp fuse that would blow when the house is on fire, maybe. Could use the extra room for the input caps.

[nar]

Hi to everybody.This is my proposal for an AlephX layout.It is close as the one I will realise by hand.Note that the unit square on my drawing is 5 mm and not 5.08 . This is because I have only normal paper.However,the final layout will be 5.08 space standard.

I have a few jumpers.I don't consider it badly,I just get rid of longer connections that way.The board is single sided,and the total layout is quite small anyway.It is also easyier to replicate than double-sided boards.

I intend to go with a total of 8 power devices.This choice is dictated by the fact I have hundred of IRFP240 in stock.Each device is intended to run at slightly more than 1 Amp bias on +/-22V power supply.I think it is right about safety power dissipation margin.Oh,I have included the Magical resistors from output nodes to sources of the differential.And I tried to go for most symmetric possible layout.

Any feedback welcome,as it is not realized yet.I am in no hurry.all thanks goes of course to tvi ,for inspiration.

Best regards to you all

Anael

PS.Warning.The board is not tested.But I guess I have no mistakes in it

[Nelson Pass]

These layouts are extremely good, particularly Fabrizio's
(Love that name).

But I want to point out something, which is that while
they are symmetric geometrically, they will still tend to
pick up stray magnetic field. Not much, but some.

Of course you can keep them away from transformers, which
I recommend anyway.

For the ultimate, though, we want to take this symmetric
layout and fold it at the middle, so that each half experiences
the same magnetic field.

For the XA200 and XA160 so far, I have intermingled the
placement of each half to achieve much the same thing -
we want the symmetric halves to experience exactly the
same magnetic field.