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Old 27th December 2006, 07:53 AM   #11
Fin is offline Fin
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Just as well Audio Alchemy no longer exists. Don't think they would be too happy about the similarity in the name of the product.
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Old 27th December 2006, 10:37 AM   #12
Foxx510 is offline Foxx510  Australia
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I ordered one today too, could be a nice budget upgrade, that DAC chip is supposedly quite nice.
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Old 27th December 2006, 12:53 PM   #13
Franz G is offline Franz G  Switzerland
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Modifications step 1:

Separate regulated voltages for digital (8VDC) and audiopart (12VDC).

Goals:

1. Better resistance to mobile phones, flashlights and so on.
2. Less heat on the AMS1117 regulator, the whole board and caps.
3. Improve the sound...

What I did:

1. Broken powerline nearby AMS1117
2. Removed 1N4007 diode and replaced by a ferrite bead.
3. Attached 12VDC (regulated) at the original points.
4. Added a 22uF tantalum for the 8VDC in.
5. Attached 8VDC (regulated) at the new cap.

At least goal 2 is reached, goal 1 not really (maybe I will use a choke instead of a ferrite bead), goal 3 hopefully

Kind regards
Franz
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Old 2nd January 2007, 02:30 AM   #14
Foxx510 is offline Foxx510  Australia
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I got mine today and so far I'm pretty happy with it. I haven't tried it with a battery yet, just the supplied plugpack. Compared to my project 85 CS8414/CS4334 DAC it is much quieter, and cymbals sound much more "real". I had no idea how tiny it would be though, that was a surprise! Will listen some more and report back.
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Old 3rd January 2007, 05:31 PM   #15
Franz G is offline Franz G  Switzerland
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Modifications, step 2:

I removed the four greenish caps and attached my first version from the Broskie cathode follower:

It works.

But I will rebuild the cathode follower with "real" tubes (E188CC instead of 6111). The problem: One channel was not working, some short between anode and grid. Maybe the tube, maybe the strip board, I used (to small distance between the traces for about 200VDC).

Here, you can see the attachment points for the balanced out from the DAC, after removing the four caps.

Franz
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Old 3rd January 2007, 05:35 PM   #16
Franz G is offline Franz G  Switzerland
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This is the chassis, to build the "real tube" module...
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Old 4th January 2007, 06:14 PM   #17
Franz G is offline Franz G  Switzerland
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Work in progress...
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Old 5th January 2007, 01:54 PM   #18
matt J is offline matt J  England
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Not very impressed with mine, what difference should I be hearing compared with say a standard internal DAC from a marantz CD67? night and day? I have connected the DAC via coax and optical and with the standard RCA out connected to the amp I can quickly switch between the DAC in box and the marantz via the input select on the amp, cant hear any difference what so ever
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Old 5th January 2007, 08:31 PM   #19
Franz G is offline Franz G  Switzerland
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Not impressed?

What power supply are you using?

Franz

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Coax AND optical connection?
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Old 5th January 2007, 08:32 PM   #20
Foxx510 is offline Foxx510  Australia
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Have you tried it with a battery? I was going from an a pretty average dac to this one so a definately noticed a difference. I might be wrong, I'm very new to this, but isn't the CD67 pretty good to start with? Remember it's a pretty cheap little unit!
All the best.
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