DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 168 - diyAudio
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Old 18th April 2012, 11:45 PM   #1671
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Quote:
Originally Posted by TheGimp View Post
The recommended filter in the manual won't be difficult to patch in and should sound better as the -3dB point is around 49.2Khz.
It's probably so but I'm not able to design it...without opamps... but the opamp filter is already on the datsheet

Anyone with more expertise is willing to do it for trasnformers?
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Old 19th April 2012, 12:47 AM   #1672
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I'm playing with some transformer output simulations driving a Lampizator. If I figure something out I'll let you know.
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Old 19th April 2012, 01:58 AM   #1673
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Here is something interesting. Peak is around 33KHz. LF roll off is primarily determined by the inductance of the transformer.

It should simply be a matter of removing the vacuume circuitry and replacing it with sand.
Attached Images
File Type: jpg Lamptizator.JPG (92.4 KB, 674 views)
File Type: jpg 6J9P_Lamptizator.JPG (88.7 KB, 663 views)

Last edited by TheGimp; 19th April 2012 at 02:03 AM. Reason: Added better image of schematic
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Old 19th April 2012, 05:33 PM   #1674
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How's this for an output stage for the ak4396?

Ray's Audio Page - Discrete Output Stage
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Old 19th April 2012, 07:16 PM   #1675
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Working on upgrade - in the BOM R24 &R34 are listed as 1KOhm and in the photo R34 is shown as 2.2K.
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Old 19th April 2012, 07:42 PM   #1676
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Working on upgrade - in the BOM R24 &R34 are listed as 1KOhm and in the photo R34 is shown as 2.2K.
Hi Bob,

if I remember correctly you bought the AK4396 version, right?

For AK4396 those resistors (R24 to R34) are specced in BOM as 2.4K (2.2K if PRPs from PCX).

1K resistors are for AK4393.
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Old 20th April 2012, 08:39 AM   #1677
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On the picture of the PCB in post #95 on page 10 of this thread there is a round capacitor marked "1uf" next to cap 28. Which one is this on the BOM?

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Old 20th April 2012, 05:04 PM   #1678
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Originally Posted by merlin2069er View Post
How's this for an output stage for the ak4396?

Ray's Audio Page - Discrete Output Stage
If I am not wrong I think that is the HDAM discrete circuit, though in this case with the CFP mod.

I think it could be tried on the AK4396, probably eliminating the 100uF capacitor, which I think it's a must in the Marantz they made it for.

Another problem is the input filter, which involves inductors.
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Old 20th April 2012, 05:56 PM   #1679
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On the picture of the PCB in post #95 on page 10 of this thread there is a round capacitor marked "1uf" next to cap 28. Which one is this on the BOM?

Regards
It should be marked C37, and is a 1 uF cap.

It doesn't appear on the "upgrade BOM" because Dario didn't see a need to replace it -- thus no change from the stock cap provided with the 2496-mini-DAC kit.

It is listed in Dario's "full BOM" as a 1 uF capacitor, 50V, any manufacturer, standard elco capacitor. My kit came with a dinky teapo 10/00 (?) cap, rated for 105 degrees C. Most of the photos posted on this thread show a larger cap, but it's up to you.

I hope that helps ! Click the image to open in full size.
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Old 20th April 2012, 06:00 PM   #1680
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I hope that helps !
no, not really
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