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Old 5th August 2009, 04:22 PM   #1
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Default USB tube DAC£¬High-quality£¬Perfect design
We DIY Working Group£¬design a USB tube DAC¡£The main channel is usb interface£¬direct input to PCM2707£¬and then directly through the I2S input directly PCM1798£¬then through four separate operational amplifier IC for I / V conversion£¬Tube output buffer stage output£¬buffer to adjust the sound level£¬also can use jumper to selected to determine whether the tube buffer stage£¬specially design multi-channel power£¬can be for headphone amplifier£¬the entire line Simple and clear£¬Pipeline Design¡£
The DAC also psimultaneously rovides two-way digital signal output: Coax and Fiber

In addition£¬tube and power supply to buy their own£¬but We are presented with two tubes PCB package

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Old 5th August 2009, 05:11 PM   #2
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can use our power supply
1)15V 0 15V 60V--------25W

2)15V 0 15V-------------15W(for headphone amplifier)

3)8V 0----------------- 16W

110V--220Vac



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In addition£¬We also designed a shell£¬headphone amplifier£¬then the power supply, headphone amplifier, usb tube DAC, assembled together£¬you can see£º
1£¬Loaded into the transformer
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2£¬Insurance and wiring installed£¬Red for the line of fire



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3£¬After the installation of transformers like
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4£¬Then loaded PCB
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5£¬Connection£¬Please be sure to remember the location of line£¡

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6£¬Installed to connect the line headphone amplifier board
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7£¬All the installation is complete£¡£¡
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front£º
http://www.hifidiy.net/jhwz/200707/W...5631715719.jpg

Backlight lamps installed£º
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Hot melt adhesive with a fixed background light £º

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consummation£¡£¡
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Power on£¡£¡
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can use computer to be switched on
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Old 5th August 2009, 05:30 PM   #3
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Perfect design? But using a 2707?!

Have we not seen this on Ebay already?
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Old 5th August 2009, 06:17 PM   #4
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perfect job.ım shocking!
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Old 6th August 2009, 09:44 AM   #5
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Quote:
Originally posted by analog_sa
Perfect design? But using a 2707?!

Have we not seen this on Ebay already?

No£¬we have not sell on ebay.

The face of low-end market, I think it is quite a good¡£

Shape design and Circuit board design£¬I think it is almost perfect¡£

Of course, we will work harder and do better

thanks
Jacky
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Old 6th August 2009, 10:07 AM   #6
wwenze is offline wwenze  Singapore
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Quote:
Originally posted by analog_sa
Perfect design? But using a 2707?!

Have we not seen this on Ebay already?
Then what else do you expect to use to get USB -> I2S to feed the PCM1798?

eBay maybe not, taobao and other Chinese websites, yes.
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Old 6th August 2009, 12:52 PM   #7
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Quote:
Originally posted by wwenze


Then what else do you expect to use to get USB -> I2S to feed the PCM1798?

I also use a 2707 but do not call it "perfect" as it really demands some kind of reclocking. An asyncronous chip would better fit this description.
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Old 6th August 2009, 12:56 PM   #8
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Quote:
Originally posted by wwenze

eBay maybe not,

Maybe yes

http://cgi.ebay.com/Hi-End-USB-DAC-P...d=p3286.c0.m14
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Old 6th August 2009, 01:50 PM   #9
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Quote:
Originally posted by yildiray
perfect job.1m shocking!

whether you meant this funny or not I admit it made my day
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Old 7th August 2009, 04:25 PM   #10
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Quote:
Originally posted by analog_sa



Maybe yes

http://cgi.ebay.com/Hi-End-USB-DAC-P...d=p3286.c0.m14

Amazing£¡We worrking group does not sell on ebay£¬and the price is equally alarming£¡Also he buys from Chinese websites£¬then turn to sell on ebay£¬this product has listed more than a year ago


Jacky
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