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Old 23rd January 2013, 04:18 PM   #201
io is offline io  Hungary
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Join Date: May 2006
Location: Hungary
What is the output filter capacitor?

io
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Old 23rd January 2013, 05:35 PM   #202
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Join Date: Jul 2005
Location: Cambridge, England
Default DAC filters

I did a google search for DAC filters. Here is a document that you might find interesting:

http://www.analog.com/static/importe...als/MT-019.pdf
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Old 23rd January 2013, 07:02 PM   #203
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Join Date: Feb 2011
Location: Madison, Wisconsin USA
Default Rs and Cs

Quote:
Originally Posted by manu54 View Post
j ask the question to hifimediy, they told me :

"You could add an external potmeter to reduce the gain. Or a single resistor. Or install a resistor R3 on the DAC. The value needed is not mentioned in es9023 datasheet, so you would have to experiment to find a good value."
ODAC uses 220Ohms series then 2200pF to ground on the outs I believe.
On thread I read, a guy used 1k each leg and loves it, I'd probably stay closer to the proven ODAC, maybe 220 or 470... I am also fooling with the Vreg pin #6 on es9023 [Ess says ~10uF and have the 2 graphs on pg 10 of the design PDF for value of parallel R to ground depending on Vcc used for the DAC 3.6 vs 3.3. ODAC uses 118K and 22uF -> I am trying 100K and 10.1uF because I had a SMD R around that value to try [stock UAE23 seems not to have an R to ground off pin #6 I could be wrong, but it seems not.]
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Old 25th January 2013, 12:01 PM   #204
alkasar is offline alkasar  France
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Join Date: Jan 2009
Location: near Paris, France
postman just brought UAE23+
It's a nice little box. Not hifimediy production anymore but Hifime Audio Studio. A new brand

UAE23 looked like a toy. + version looks like a commercial dac, nicely finished in metal box.

In my mayuseoneday box , i found a suitable 9Vdc powerplug
Dac was immediately recognized by my laptop running windows 7 as "DAC Hifimediy (Sabre+ 24/96)", same as previous. I use default windows driver.

UAE23+ sounds very nice. ES9023 sound is there. To my ears, it's hard to hear a difference with the non-isolated version. Difference must be tiny, especially if no grounding issue existed with USB. I'll measure them both later and see if I can find a difference.
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Old 25th January 2013, 02:24 PM   #205
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Join Date: Feb 2011
Location: Madison, Wisconsin USA
Default Isolation

Maybe you have less noise to start with? Having used fiber USB isolators, everyone in my family I give one to is happy. Silent regions are more quiet it seems. I live in a city, when I walk outside, there is a "city noise", I don't notice it but if it were gone, I might.

I'm pleased HifimeDIY added USB isolation; nobody has that feature at any where near this price-point. And as a DIY nut, the 23+ should be easier to MOD into something even nicer. The flexible range of power sources...more space... RCA jacks... a external power jack that can take AC or DC sources...

Quote:
Originally Posted by alkasar View Post
postman just brought UAE23+
It's a nice little box. Not hifimediy production anymore but Hifime Audio Studio. A new brand

UAE23 looked like a toy. + version looks like a commercial dac, nicely finished in metal box.

In my mayuseoneday box , i found a suitable 9Vdc powerplug
Dac was immediately recognized by my laptop running windows 7 as "DAC Hifimediy (Sabre+ 24/96)", same as previous. I use default windows driver.

UAE23+ sounds very nice. ES9023 sound is there. To my ears, it's hard to hear a difference with the non-isolated version. Difference must be tiny, especially if no grounding issue existed with USB. I'll measure them both later and see if I can find a difference.
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Old 25th January 2013, 02:42 PM   #206
gk7 is offline gk7
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Join Date: Oct 2007
Location: Vienna, Austria
Quote:
Originally Posted by hifimediy View Post
Hi, UAE23 now has special version can accept optical input (to PC). ...
Where can I get this special version ? SPDIF to USB is exactly what Iīm
looking for. The hifimediy.com website states "Optical input to USB" but
where would the optical input be ? Canīt see it on the photos provided.
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Old 26th January 2013, 09:46 AM   #207
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Join Date: Sep 2010
Default First impressions

Received this Dac in exactly one week, quit fast from China to Holland. It is the new + version, so I can try it also as a usb to spdif converter.

I play my music from an Imac. The Dac is recognized immediately as a Sabre 24/96 device.
For playback I use Bitperfect, a software utility for better audio output. Bitperfect has the opportunity for upsampling to 96 kHz. I was surprised that upsampling did not improve the output-sound. To much bass. So I turned it off and now I am quit happy with the overall sound.

I still have to compare it with my HK-dac, which lacks the usb input. And try it as a usb-spdif converter through the HK-dac. So lots of possibilities to try. And many hours to come with listening. Will be continued.
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Old 27th January 2013, 12:15 AM   #208
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Join Date: Oct 2004
Quote:
Originally Posted by gk7 View Post
Where can I get this special version ? SPDIF to USB is exactly what Iīm
looking for. The hifimediy.com website states "Optical input to USB" but
where would the optical input be ? Canīt see it on the photos provided.
HiFimeDIY Sabre USB DAC. 96khz/24bit - ES9023+TE7022 + USB to optical converter
Quote:
-Usb to optical converter. Outputs optical signal if you connect a 3.5mm optical cable in place of a 3.5mm audio cable. Can be useful for connecting your computer to another DAC without usb input.
-Optical input to USB. - This can be used to record a digital optical signal on your computer through USB. Note that the optical input signal can not be routed to audio (analog) out on this DAC.
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Old 27th January 2013, 01:31 AM   #209
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Join Date: Feb 2011
Location: Madison, Wisconsin USA
The allusion to optical input may have been a slight mistake; the TE7022 can take the input but I think the standard UAE23 OUTputs optical, not like the outdated picture on the site, but right behind the upgraded UAE23 3.5mm "Walkman" port is a red LED emitter -- being only a 2-lead device I doubt the stock vanilla UAE23 could input SPDIF from the optical arrangement it has. They MAY have input circuitry hiding in there they can mod for special customers. My guess.
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Old 27th January 2013, 08:10 AM   #210
gk7 is offline gk7
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Join Date: Oct 2007
Location: Vienna, Austria
enjoybiking, you are correct:

I asked HiFimeDIY directly and got this answer:

"we discovered that we had to chose one, either optical in or optical out. We decided to stay with only optical out, as that can be useful to most customers. I have updated /removed the reference to optical in, but as we have this listed on several sites, there might some places where this information is still present. I apologize for any misinformation about this."

So it seems there is no optical in -> USB.

Itīs nevertheless still an interesting product, especially for the price asked.

Does anybody know of a similar product that has digital in and out to USB ?
I own a DAC, an RME ADI-2, where A/D and D/A are independent and can be used at the same time (24bit, 192kHz). This
is connected to a RME Digi96, a PCI card with digital I/O (24bit 96kHz). What I want to achieve is the same
thing over USB (maybe with 192kHz capability if possible), so I can use a Laptop instead of the old PC with PCI slots.

Last edited by gk7; 27th January 2013 at 08:21 AM.
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