Hifimediy ES9023+TE7022 24/96 USB Dac - Page 18 - diyAudio
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Old 10th January 2013, 01:30 AM   #171
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Quote:
Originally Posted by quantran View Post
Hey anh, I didn't know you were here too. Have you compared it to the moded AE?
Hey Quan! I don't think PCM2705 is potential for modification so I didn't spend much time with AE. I think the moded AE lack detail. Will try take USB signal from AE and send it to TE7022. It makes this DAC become more convenient with wireless

@diykast: I would take some pics, perhaps in this weeken when have time to finish. Now this work with bread board like a mess
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Old 10th January 2013, 10:14 AM   #172
diyskat is offline diyskat  Australia
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Quote:
Originally Posted by diyskat View Post
What is the recommended driver then? I know people have mentioned the TeraLink-X2 driver before but is that the best one?
Answering my own question - Found out that in the ebay listing for the UAE23 they did provide links to the recommended TeraLink-X2 drivers.
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Old 10th January 2013, 06:26 PM   #173
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Default Power Supply/Connector for UAE23+

RE:Sabre USB DAC (external PSU) . 96khz/24bit - ES9023+TE7022 + Coaxial OUT Model:UAE23+

Any recommendations for a PSU for use in the United States? As the unit is only $59, I'd rather not spend too much.

I sent HiFimedDIY an email asking if they will be offering an external PSU, and if so, when will it be available. I'll update when I get a reply.

TIA!
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Old 11th January 2013, 03:00 PM   #174
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Some photos of the DAC with USB isolation board and independent power supply.
Attached Images
File Type: jpg IMG_0300.JPG (33.8 KB, 620 views)
File Type: jpg IMG_0301.JPG (34.3 KB, 592 views)
File Type: jpg IMG_0302.JPG (36.6 KB, 516 views)
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Old 11th January 2013, 03:09 PM   #175
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Close up photo of the power supply.
9VAC -->full wave rectifier bridge --> Filter cap 1000uF Nichicon Muse Kz--> 10VDC --> LT1963 -->8VDC --> ADUM4160 Isolator board --> DAC
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Old 11th January 2013, 03:36 PM   #176
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The new version need only a 9v transformer to work the rest of the power supply is built-in but that's not the end of it if you want the best sound possible.

A small 9v transformer is relatively cheap.

Quote:
Originally Posted by sawdin View Post
RE:Sabre USB DAC (external PSU) . 96khz/24bit - ES9023+TE7022 + Coaxial OUT Model:UAE23+

Any recommendations for a PSU for use in the United States? As the unit is only $59, I'd rather not spend too much.

I sent HiFimedDIY an email asking if they will be offering an external PSU, and if so, when will it be available. I'll update when I get a reply.

TIA!
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Old 11th January 2013, 03:50 PM   #177
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Thanks...
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Old 11th January 2013, 04:57 PM   #178
alkasar is offline alkasar  France
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@quantran. huge heatsink on lt1963! It is a lowdrop reg, any reason you use 9Vac ?

also why lt1963 ? it's a good chip, but would'nt a pre-reg with better ripple specs be more appropriate for this job ?
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Old 12th January 2013, 12:45 AM   #179
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I didn't know the current draw for both the usb isolation board and the dac so I just use one relatively large heat sink that I have on hand. In fact, I can't feel any heat when I touch it. It seems very low current is drawn by the circuit.

I chose 9vac because the isolation board specification requires min 8vdc. 9vac gives 10vdc after retification and filtering. Note that the Isolation board has its own discret regulator. I think max drop out on lt1963 is 2v and max drop out on the onboard discret regulator is 3v.

In fact there are 3 regulator before the DAC chip. Lt1963 - onboard regulator of the isolation board and then LT1763 on the DAC pcb. Therefore i think ripple rejection would be good.

May be inserting a current regulator in place of lt1963 is best but lt1963 and the pcb is readily available to me... Do you have any recommendation on this? Which other chip is better?
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Last edited by quantran; 12th January 2013 at 12:49 AM.
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Old 12th January 2013, 12:54 AM   #180
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For v2 with integrated isolation chip you may use lower ac voltage. I personnally also prefer supply voltage as low as possible. Not just less heat but also better sound to my ears. More current reserve is better but too high voltage is not good.
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