Hifimediy DAA1853 DAC - AD1853/CS8416/OPA2134 - Page 2 - diyAudio
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Old 14th June 2011, 03:55 AM   #11
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Folks should be familiar with Hifimediy by now - their TK2050 amp has a huge thread in the Class D forum for a long time now... I look forward to hearing more about the DAC.
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Old 14th June 2011, 01:19 PM   #12
zog666 is offline zog666  Australia
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Originally Posted by wushuliu View Post
Folks should be familiar with Hifimediy by now - their TK2050 amp has a huge thread in the Class D forum for a long time now... I look forward to hearing more about the DAC.
It was from my positive experience with their TK2050 amp led me to take a punt on a fairly unknown product out of curiosity.

I have just had a listen to it on a bigger system, after leaving it playing most of a day to settle in.

using:
Roland UA-30 soundcard->toslink->
Hifimediy DAA1853->Wanfai Lau passive attenuator
Connex TA3020 v3c->Econowave speakers

I don't have a lot of experience with DACs, I've been using AlienDAC, my MiniDSP, and Behringer USB soundcards.

Don't really have any blind tests or scientific results, so I'll just try and describe it, after plugging it in and comparing my memories of my combinations of equipment I have tried:

The Hifimediy sounds very smooth, pleasant, but still with a lot of detail, I really thought i could hear more of the activity (finger plucks, strums, etc) of recordings of acoustic instruments. Sweet!

Also very very quiet, despite my pretty quick utilitarian enclosure and wiring implementation.

I decided to run with a passive attenuator first, as given the opamps on the board it should have plenty of power to drive the amp direct without a pre-amp .. and it does!

Curious as to what the two ne5532 opamps on the board are for.. as it has 2 opa2134 already.. are they in the signal path? WOuld replacing them with opa2134 help or hinder the unit?
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Old 17th June 2011, 03:20 PM   #13
zog666 is offline zog666  Australia
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Curious as to what the two ne5532 opamps on the board are for.. as it has 2 opa2134 already.. are they in the signal path? WOuld replacing them with opa2134 help or hinder the unit?
Correction.. they are 2 x ne5534 opamps (single rather than dual). Bit of reading and they appear to be not easily replacable without a bit of knowledge of the circuit - and are supposed to have pretty good performance anyway. It's amusing they don't get to headline in the product description on the hifimediy site along with the opa2134s, although they also appear to be in the signal path.

There is also 2 jumpers in the digital section labelled 2X and 4X (J3 & J4) .. no idea what they are for.

I've asked in email and via PM here for any circuit diagrams or other documentation on the unit but haven't got any response.

been listening to the unit for a few days now, still sounds great!
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Last edited by zog666; 17th June 2011 at 03:25 PM.
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Old 17th June 2011, 04:10 PM   #14
zog666 is offline zog666  Australia
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A bit of reading and googling on the AD1853 and this link to google books has made it clear to me what the OPA3124 must be doing (filter and current to voltage converter) - while the ne5534 is acting as a buffer on the output.
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Old 2nd July 2011, 03:42 PM   #15
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Originally Posted by hifimediy View Post
Hi, it's new and I hope that you will like it.
I just got mine - can you tell me what the 2x/4x J3/J4 jumper is for? And what size (va) power supply transformers you recommend?

Thanks,

Bruce Bender
Washington, DC, USA
(used to be Santa Fe)
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Old 3rd July 2011, 04:07 AM   #16
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hi, you can short 4x jumper for 96kHz and 2x for 48kHz signal. And remember don't short them both, 4x is ok for 48kHz too.
I think 20VA is enough for this board.
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Old 3rd July 2011, 05:07 AM   #17
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Originally Posted by hifimediy View Post
hi, you can short 4x jumper for 96kHz and 2x for 48kHz signal. And remember don't short them both, 4x is ok for 48kHz too.
I think 20VA is enough for this board.
Some mistake, I have to correct 4x and 2x description. these jumpers are used to select interpolation ratio, and short them means assert high.
Left both jumper open, for use with 8x speed inputs(44.1kHz or 48kHz).
Short 4, for use with double-speed inputs (88 kHz or 96 kHz).
Short 2, for quad-speed inputs (176 kHz or 192 kHz), set 256xFs also.
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Old 4th July 2011, 02:04 AM   #18
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Originally Posted by hifimediy View Post
Some mistake, I have to correct 4x and 2x description. these jumpers are used to select interpolation ratio, and short them means assert high.
Left both jumper open, for use with 8x speed inputs(44.1kHz or 48kHz).
Short 4, for use with double-speed inputs (88 kHz or 96 kHz).
Short 2, for quad-speed inputs (176 kHz or 192 kHz), set 256xFs also.
OK, thanks for the quick reply!

Mine came with the 2x jumper shorted, so since right now I am using plain old 44.1kHz CD I will take that off and short neither. If/when I get some higher speed input going on I will short the appropriate jumper.

Last edited by bdbender; 4th July 2011 at 02:17 AM.
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Old 6th July 2011, 02:10 PM   #19
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@hifimediy, is 12v 0v 12v the max for the main power, or is 15v 0v 15v OK?
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Old 7th July 2011, 02:44 PM   #20
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Originally Posted by pythonic View Post
@hifimediy, is 12v 0v 12v the max for the main power, or is 15v 0v 15v OK?
hi, it's ok to use 15-0-15, and 18-0-18V is maximum.
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