Some serious Aleph Ono pr0n

[Bakmeel]

My fellow DIY fanatics....

I am proud to present my very own and finally finished Aleph Ono!

I have been working on my project for more than 1.5 years now, where most of my time went into debugging the PCB's. Especially the first version was a complete disaster, and people who have read the "ono group buy" thread, might remember the catastrofy...

Nevertheless, I picked up work about 3 months ago, first finalising the second prototype, and then, after a few more tweaks the final version.

Most of the cost went into the capacitors. About €300,- all together. Of that budget, more than half went in the power supply which really is fenomenal. NO ripple whatsoever... . working deeper in de supply rails (further away from the rectifier), the caps have lower ESR, closer to the place where it is needed. With that in mind, I believe the PSU is really fast in response. The rest of the caps are really nice polypropylene and polystyrene caps.

Through Farnell, I was able to get a batch of fets, which all came off the same die (same batch numbers). I practically didn't need to match them... they were all the same

The case is MDF, cladded with copper foil on the inside for EMC shielding, and mahogany veneer on the outside.... 8 layers of lacquer were added.

The fronts were really special. I imprinted text on a piece of aluminium, then glued a piece of plexiglass (perspex) in front of it. The plexiglass has a groove milled in it, which is lit by the 7 (!) blue leds on top of the plexiglass. The leds themselves are invisible, there is just a nice blue glow over the aluminium and the plexiglass.

Then for the sound.... Unfortunately, my turntable is a real piece of crap. €5,- I once spent in a recycling store, and it sounds just like that. But nevertheless, listening through all distortion, it actually sounds really, really great...

Now for the promised pr0n

The front panels...

[Bakmeel]

The two, with glow on... (it can be regulated )

[Bakmeel]

.... And this happens when you turn the lights off...

[Bakmeel]

And these are the insides... The little board to the far left (with the silverish heatsink) is a dedicated "blue led regulated adjustable power supply"

[Bakmeel]

Close-up of the PSU

[Bakmeel]

... and the main boards.... note the extra bank of elko's in the psu rails at the bottom...

[Jarno]

Looks great Bouke!

Groeten,

Jarno.

[Mad_K]

Very, very impressive work

[Netlist]

Originally posted by Bakmeel
The case is MDF, cladded with copper foil on the inside for EMC shielding, and mahogany veneer on the outside.... 8 layers of lacquer were added.

Once I heard a Rolls had 17 layers.
Very nice amp. I particularly like the small black rectifier diodes surrounded by the red caps. What did you use as diodes?

Watch out!! The brown wire of the left trafo might come loose

/Hugo

[Bakmeel]

Originally posted by Netlist

I particularly like the small black rectifier diodes surrounded by the red caps. What did you use as diodes?

Watch out!! The brown wire of the left trafo might come loose

They are ordinary 1N4004 diodes, just like the schematics suggested. The red caps are wima mks 100nF / 100V