Finally, a much higher end DAC released, with much lower price and much smaller size! Have no time to post the detail of it until today due to busy working hours. The design goals were built by optimizing the layout to maximize the performance of the DAC while maintaining tiniest possible size.

The selling price was squeezed to lowest possible by introducing lowest possible parts count of SMDs and avoided the use of unnecessary expensive and meaningless electrolytic capacitors, either in signal or power paths. With the integration of negative charge pump in the DAC, there are no capacitors throughout the signal paths that will colorize the sound characteristics to retain purest possible audio signals transmission. Throw away the need of high or low frequency filtering stage on signals path ensuring full signals transmitting. Shortest signals travelling, reducing EMI throughout the DAC. And finally, introducing with direct connectivity to your USB slot without additional USB cable greatly reduced the messiness of cables on your tables.

The premium point is that the DAC is using ESS sabre ES9023, which can outperform most of the commercial DACs at a certain value. My words on this product is, don't judge the performance of this DAC base on the size and the selling price that will biasing your final conclusions.




I have named this as UD100 as the first product under my newly registered trading company. And I have added a logo on my PCB to protect myself from the same incident happen again.

A simple review from my friend, click

This post has been edited by chchyong89: Aug 2 2012, 07:44 AM

double surface mounting. USB receiver is on the back side.


-the old kakis on this forum know this

-molding a case will increase the selling price a lot.

-There will no desktop size DAC until 2015 in the planned road map. By the way, you don't need large current output unless you are using it to drive your headphone directly, or you are connecting to a super low input impedance amplifier.

This post has been edited by chchyong89: Aug 2 2012, 07:19 AM

Very low



you will change your opinion after you audit it.



At left USB mounting, the jack is facing to front, while on the right side, the jack will facing backwards, I think this is good enough for arranging cables on the table

Its good to hear that you have 3 DACs ready at the moment to carry out comparisons! Let me know if you can drop by at pj after 830pm, I can borrow you a sample.

This post has been edited by chchyong89: Aug 2 2012, 07:51 PM

The gap is too big to compare

shure



haha, yeap. I did a stupid FYP btw


Great skill in photo capturing!

It work, but it's not recommended due to limited output current and the output impedance is not low enough.

Hi, its possible but you are decreasing the bit resolution of
your song. It's recommended to control on your amplifier/preamp.

The default state is at 0dB (maximum loudness), when u lower down 6dB, you are reducing 1 bit.

This is another picture comparing the ODAC to the UD100.

Photos by my japanese customer.


Onkyo GS-1


Yoshii9




This post has been edited by chchyong89: Aug 23 2012, 12:02 AM

Heat shrink

^A very very good solution to dress up the UD100.

More photos from oversea buyer :

Glad that you love it But loudness is another thing, once you get an proper amp you will


Moaaarrr photos:


From the bottom, FA1242A×4, TDA1543×4, DX100, UD100.


Camera connection Kit → Ballanced FET Headphone Amp → Balanced PRO900

By Kosei Igarashi

Many thanks to ClieOS for his kind words


Sorry boss

If you are driving IEM/earphone/headphone, sure

will the battery drain off fast with the UD100?

I will leak some rumour when I am ready to launch the new dac. But not that soon.

The distortion level of the 2VRMS(max) signal should be very very low, that should be not noticeable on human ears, unless you are using the dac to drive any load. The thing that distorted the HCS2330's satellites should be the integrated amplifier inside your sub, try lower down the volume on the edifier.


I will squeeze everything I know into the next DAC, however, still a lonnnnnnnnnng story from now.

This post has been edited by chchyong89: Oct 6 2012, 05:21 PM

It's definitely an upgrade.

Btw, anyone who tested the UD100 on IPAD, will the volume control function-able? I don't have an IPAD to try now.

No you can't