DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 189 - diyAudio
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Old 16th June 2012, 05:35 PM   #1881
goody75 is offline goody75  United States
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Default Can I use a 24V transformer?

I bought one of these kits this past February and am just getting around to building it. The DAC is going to go into a DIY integrated amp based on a popular LM3886 gainclone.

The transformer I am using for the amp is an Antek AS-3224 (300VA, 24-0-24 Vdc). I know that the DAC wants transformer with a much lower voltage but is there some way I could bypass part of the DAC's power supply and feed the DAC's regulators from the amp's power supply (rectified & smoothed power)? If so, would it be a good/bad idea to use a resistor to drop the voltage some? And what should the wattage rating be be used for the resistor?

Thanks for your help,
goody75
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Old 16th June 2012, 06:29 PM   #1882
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Hi Goody,

Please do NOT do this.

Buy two separate transformers (see order numbers below), or buy them at local radio store or where ever.

The DAC kit should be galvanically isolated from the main amp.

The numbers

RS: 278-6908
Farnell: 9531548

You can have any type transformer (block or toroidal). The "big one" should be able to supply 5VA at least and have 2 x 18V as secondary windings.
The other one CAN have one secondary winding at 9V and at least 3VA. You can also have two secondary, then put them in parallel.

The transformers are so small, you can fit them probably anywhere. Put a 150 mA fuse at the primary side for both transformers.
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Old 16th June 2012, 07:23 PM   #1883
pchw is offline pchw  United States
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Go to nearby Radioshack and buy one of this. Also, search this thread for how to connect with one transformer.
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Old 16th June 2012, 08:11 PM   #1884
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Interesting discussion on transformers and fusing. Has anyone actually compared the results for this DAC with a single transformer vs two? Many have reported good results with the C-style 30VAC transformer (e.g, marked AC4.265.5387) sold by the ebay suppliers of this DAC kit.

Regarding fusing, you may want to refer back to post from member Col_s 29 July, post 406]... Post explains rationale for "Each transformer should have its own appropriately sized fuse on the mains side of the transformer ... based on the rating of the transformer .... Further fuses can be used on the secondary side to protect the devices that you will be powering ... sized for the load." Also rec'ds star grounding, and has links to discussions on other forums.

If others agree, feel free to chime in. I'm a newbie here, so I'm not able to offer a recommendation from my own experience.
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Old 17th June 2012, 01:40 AM   #1885
goody75 is offline goody75  United States
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Thanks for the warnings and the suggestions. I have another question about the bridge rectifier. I bought a blank board and am trying to finish up my part order. The KBP206 that the BOM calls for is not stocked at mouser. Can anyone tell me if any of the following will work.

Vishay 2KBP06M-E4/45
GenieSIC Semiconductor KBP208
Fairchild 2KBP08M

Thanks again,
goody75

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Old 17th June 2012, 02:26 AM   #1886
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Quote:
Originally Posted by goody75 View Post
I bought a blank board and am trying to finish up my part order. The KBP206 that the BOM calls for is not stocked at mouser.
You're wrong.

The BOM for bare boards on my Google folder indicates this mouser code: 621-KBP206G

that code is available (479 on stok in this moment)...
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Old 17th June 2012, 03:17 AM   #1887
goody75 is offline goody75  United States
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My mistake. Thanks, Clave.
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Old 17th June 2012, 08:55 PM   #1888
bcmbob is offline bcmbob  United States
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Here is a reply I stumbled across from the guys at JRiver that might shed some light on the 192K search.

Playing 192k files
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Old 17th June 2012, 09:28 PM   #1889
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By the way, for anyone looking for part numbers from Mouser for Dario's Simple Shunt build, I looked up the following. Some of these are slight substitutions, so make your own choices accordingly. But this could save you some legwork....

MOUSER BOM for Simple Shunt Regulator

IC101 / IC301: ON Semi LM317 IC .... 863-LM317TG
IC201: ON Semi LM337 IC .... 863-LM337TG
R301: Caddock MP915 .... 684-MP915-20
R101 / R201: Caddock MP915 (2 X 20; 39 Ohm not stocked) .... 684-MP915-20
R102 / R202 / R302: Caddock MK132 (100 x2; 200 Ohm not stocked) .... 684-MK132V-100
D101 / D201: Fairchild Semi. Zener, 12V .... 512-1N5242BTR
D301: Fairchild Semi. Zener, 4.3V .... 512-1N5229BTR
T101 / T101: Fairchild BD139 transistor .... 512-BD13916STU
T201: Fairchild BD140 transistor .... 512-BD14016STU
C103 / C203 / C303: Nichicon FG 100uF 50V ... 647-UFG1H101MPM
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Old 17th June 2012, 10:17 PM   #1890
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Regarding the Simple Shunt regulator, at some point earlier this thread, there was discussion of extending it to power the +3.3V leg of the DAC. (Thus, the corresponding parts were named IC401, T401, R401, R402, D405, etc).

Dario, did you try this out? If so, did 43 ohms prove to be the appropriate value for R401?
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