My Aleph-X compact PCB

[TS Lo]

Hi Bruno,

I'm interested in some boards as well as
power resistors/MOSFETs.

I'm starting to read those threads about Aleph-X.
BTW is VR101 200R??

Cheers

TS

 

[Carondimonio]

Hi all,

well, as for the input caps, no way!!!
They wouldn' t fit on this board even leaving the heatsink out, unfortunately PP caps are wayyyyyy to big. Using MKT caps would make things easier, but I' m not sure the sonic results would be as good as with PP...

TS Lo:
VR101 is 50K.

Cheers,

Bruno

 

[jleaman]

Hi grataku,

hmmm... well, I' ll try to fit the input caps, I guess 2 uF should be OK, what do you think?

Hi jleaman,

the output boards are daisy-chainable, there are also pads for screw terminals with a 200 mil step for this purpose (and, of course, normal soldering pads).
As for the group buy, well... I do not know, it depends on how many people are interested.

Cheers,

Bruno

Im just asking if i can use 4 fets or less or do i have to have huge output stage ? I dont want a power ful amp maybe 20watts ?

 

[still4given]

I believe 4 is the minimum. Have you looked at the Aleph-X Wiki ?

A lot is answered there.

Blessings, Terry

 

[jleaman]

I believe 4 is the minimum. Have you looked at the Aleph-X Wiki ?

A lot is answered there.

Blessings, Terry

Thanks terry ill check it out.. ID like to build it and see how this compairs to the Aleph mini's that i love..

 

[Carondimonio]

Version 5 - Input caps

Hi all,

well,version 4 has been trashed, don' t ask me why...

I redesigned the board completely and now I have found the place for two PP input caps

The two resistors between outputs and ground (33R 3W) will be mounted on the bottom part of the board, OR stacked above the big output resistors.

Any comments?

Cheers,

Bruno

 

[Carondimonio]

Oh, yes... here' s the schematics (taken from Kristjan site):

 

[Carondimonio]

Yes, I know, I posted the wrong one...

This is the one with mounting holes!

 

[audiotux]

Hi Bruno ,
beautiful , i like it very much
very compact
maybe i use it as headphone-amp

Greetings from Germany

jürgen

 

[analogair]

Bruno

Great work. Nice boards you designed

analogair

 

[Carondimonio]

Hi all,

thanks for the compliments, guys!

Right now I' m taking a shot at redesigning the output boards; I would like to make them a bit more compact and, at the same time, to maximise the distance between the hot spots, as for the suggestion from Mark Stones.

I was also thinking to design a rectifier board (well, this shouldn' t be a big task...), so..stay stuned!
In the meanwhile, I would really appreciate any suggestion/constructive criticism to help me improve these PCBs.

Cheers,

Bruno

 

[Stones]

Good job,

Have you found room for the soft start, Just kidding.

Keep it up.

 

[Carondimonio]

As promised...

Hi all,

here' s the new power poard (4" x 1.2"). Any comments?

Have you found room for the soft start, Just kidding.

Cheers,

Bruno

 

[Stones]

Re: As promised...

here' s the new power poard (4" x 1.2"). Any comments?

Move the "drain" track into the middle.

 

[jleaman]

I think im going to have to order heat sink's... Im definatly wanting a set of these ..

 

[Carondimonio]

Re: Re: As promised...

Move the "drain" track into the middle.

Hi Mark,

to move the "drain" track into the middle I should change also the order of the connecting pads. Not that important, but I do not like it aesthetically...

So, after some thoughts, I decided to revert to the previous placement of the mosfets (along the long side), but keeping a greater distance between them.

What do you think?

Cheers,

Bruno

 

[rchua77]

I feel the latest output stage board would be more suitable. I like the idea of having the FETs along the long edge.

Hope there'll be a group buy for this!! It looks fantastic!

 

[Stones]

Well um I was being a wee bit pedantic (did I spell that right?)

 

[Carondimonio]

Rectifier Board

Hi all,

well, I designed a first draft of the rectifier board.
It' s 3.2" x 3.2" and can accommodate both TO-220 (MUR15XX and the likes) and TO-247 (MUR 30XX dual rectifiers with common cathode) rectifiers.

Usual question: any comments/suggestions?

Cheers,

Bruno

P.S.: Mark, you weren' t being pedantic, your suggestions have been deeply appreciated and very useful for a noob like me!

 

[steenoe]

Hi Bruno, here is a rectifierboard that's known to work Just for inspiration http://www.diyaudio.com/forums/showthread.php?s=&threadid=42105&highlight=
Your A-X boards are looking great

Steen