Hifimediy ES9023+TE7022 24/96 USB Dac - Page 12 - diyAudio
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Old 17th December 2012, 11:47 AM   #111
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Hi enjoybiking

Thanks for the schematic. That is for the ODAC which use the same chips set but more complex power supply. The Micrel regulators used there is low noise type. The specs of ODAC is quite amazing considering it using usb bus power.

A full wave bridge and a 7805 should work fine but not optimal. I would go for LT1963 which I can get for very reasonable price and much better than 7805. No need to have fake load for USB bus supply I believe.

Battery is a good idea. My friends use battery with their moded airport express with good result but the still use several low noise regs after the battery.


However, an Isolator is still good for decoupling noise on data signals. The isolator must have good power supply too.
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Last edited by quantran; 17th December 2012 at 11:49 AM.
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Old 17th December 2012, 04:13 PM   #112
McDark is offline McDark  Russian Federation
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Quote:
Originally Posted by mfaughn View Post
What I hear is that the example of the HifiMeDIY DAC that I have sounds, to me, slightly less pleasing than the example of the uDAC2 that I have. This is utterly inarguable. I don't know what your basing your belief that this can't be true on? specs?
I see your point. Of coarse good sounding definition is very subjective (as the good ears, too). Maybe I was excessively offensive and would like to apologize for that. But one thing remains constant - I do HEAR the opposite and I can logically explain that, both in terms of specs and simple logic. Anyway someone who will read this discussion should be aware of both points of view, I guess.

I was not talking about the inside build quality of uDAC2 yet, that's probably subject for different thread. I was unpleasantly surprised when opened it to fix dead output. Manually added cheap electrolythic caps, matte solder, unwashed flux, wire jumpers... Pretty unexpected for Made in U.S.A. stuff. But I dunno maybe exactly these things make it sounding that special pleasant (or unpleasant?) way.

ES9023 are perfect demistyfing devices - they built to be used in extremely simple way and there are no real method to "improve" their sound against simple direct connection (at least when used with amp not cans). Adding something should be of same or better specs so the total quality will be not compromised. I know so far only one such approach - Patrick's EUVL.
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Old 19th December 2012, 06:53 AM   #113
vitt is offline vitt  Russian Federation
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What level of equipment one should have to hear the difference of this DAC and PCM2704? I'm thinking about upgrade to ES9023 from PCM2704 but won't my Ety's ER6i be a bottleneck and I'll hear no change?
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Old 19th December 2012, 07:09 AM   #114
cotdt is offline cotdt  United States
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You would hear a change with any equipment. The ER6i's are actually extremely revealing.
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Old 19th December 2012, 07:27 AM   #115
qusp is offline qusp  Australia
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not that revealing, neither bass or treble extension is fantastic on the ety ER6i... but I would still expect you to hear a difference from the rather lowly pcm2704, which is a part at the center of why USB audio initially had such a bad name.
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Old 19th December 2012, 05:29 PM   #116
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Default TE7022 1.8V

Quan,

I was confused so I went and read specs, the TE7022L has it's OWN internal 1.8V source, in case the schematic is confusing.
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Old 20th December 2012, 10:36 AM   #117
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Thanks, I also found out about this.

Quote:
Originally Posted by enjoybiking View Post
Quan,

I was confused so I went and read specs, the TE7022L has it's OWN internal 1.8V source, in case the schematic is confusing.
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Old 22nd December 2012, 02:22 PM   #118
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Hi guys. we may have new toy with usb isolation.
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Old 22nd December 2012, 05:03 PM   #119
alkasar is offline alkasar  France
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Quote:
Originally Posted by hifimediy View Post
Hi guys. we may have new toy with usb isolation.
where ?
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Old 22nd December 2012, 06:22 PM   #120
azimut is offline azimut  Italy
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Quote:
New batch has a bonus feature: the ouput also acts as a optical output if you plug a optical cable in place of the normal 3.5mm cable. So this device can also act as a USB to optical converter.
http://hifimediy.com/index.php?route...&product_id=83

An usb isolator is still needed if I want insulation using 9023...
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