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Old 29th July 2009, 05:28 AM   #1
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Default SmartDAC-One

Hi Everyone

Soon to be released The SmartDAC-One

Features will include

High quality Burr Brown DSD1794A 24bit/192kHz DAC
Input selection via Two Channel SRC4392 Sample rate converter
3 x Digitally selectable SP/DIF, AES and TOSLINK inputs.
AES and I2S Outputs
Balanced Inputs and Outputs as well as RCA Unbalanced.
PC or iMAC connectivity via USB or Ethernet connection.
Digital Volume and Input selection via Quadrature control.
Volume and Balance setting displayed on LCD or OLED display.
Built in upgradeability with high speed ATMEL 400mhz ARM Processor.

Click the image to open in full size.

For more info and pictures see the link below...
http://www.aussieamplifiers.com/DAC-1.htm
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Old 31st July 2009, 04:43 AM   #2
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Default SmartDAC-One Update

Here is a further update on the PCB progress.
The PCB is a 4 layer design and we will be finalising the PCB layout in the next 24 hours and the PCB layout will be commited to a PCB board run and a production prototype could be assembled in as early as weeks times. So things are starting to really more along now.

If any of you would like to be placed on an email update list please drop me an email and I will place you on it.

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Old 1st November 2009, 01:14 AM   #3
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Hi Everyone

The SmartDAC Project is one step closer to completion with the
first production prototype shown below.
We still have some more software development to do, before final release.
But we are expecting to have it available by Christmas 2009 if all goes well.
More information to follow soon.

If you would like to be placed on an update notification list, please get in contact with me via the following email address aussieamplifiers@bigpond.com.


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Old 17th February 2010, 04:09 PM   #4
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Wny LME49740 op amp?

Burson HD Audio Opamps... sound better....
HD Audio Opamp

Last edited by pcsl999; 17th February 2010 at 04:12 PM.
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Old 17th February 2010, 10:10 PM   #5
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Quote:
Originally Posted by pcsl999 View Post
Wny LME49740 op amp?

Burson HD Audio Opamps... sound better....
HD Audio Opamp
Hi PCS

The Burson opamp may well sound better, but it is not a practical device to use
in a commercial product, such as the SmartDAC.
It much too large.
The LME49740 is an excellent device and does sound very good indeed and because of the small packaging is we suited to the application it is applied to in the SmartDAC.
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Old 18th February 2010, 07:08 AM   #6
rabbitz is offline rabbitz  Australia
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The Burson op amps can sound very good indeed but need rails higher than 15V to perform at their best and even then there are op amps that can do a better job more simply, with less heat and smaller. I've used both the Burson op amps and their buffer but were replaced by op amps.

Is the LME49740 similar to the LM4562 but a quad?
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Old 18th February 2010, 08:16 AM   #7
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Quote:
Originally Posted by rabbitz View Post
The Burson op amps can sound very good indeed but need rails higher than 15V to perform at their best and even then there are op amps that can do a better job more simply, with less heat and smaller. I've used both the Burson op amps and their buffer but were replaced by op amps.

Is the LME49740 similar to the LM4562 but a quad?
o

Hi Peter

So what opamp did you replace them with in the end?

Too answer your question , The LME49740 is the quad version of the LM4562.
The idle current in these opamps is quite high and it makes the 14 pin package, run quite warm indeed.
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Old 18th February 2010, 09:29 AM   #8
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Look...
½ҳ 1

China guy copy & develop HDAM Module... price USD12 ~ 30....
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Old 18th February 2010, 11:20 AM   #9
rabbitz is offline rabbitz  Australia
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Quote:
Originally Posted by The Saint View Post
o

Hi Peter

So what opamp did you replace them with in the end?
Hi Anthony

I went with the AD825 for a while and then changed to the LM4562. Very happy with the result and these were used on the output stage of CD players plus one buffer. I tried lots of others such as LM6171, OPA627, OPA2604, OPA2132, OPA2134, AD843 etc and were mostly used to replace 5532 or 4558 in CD players.

I found the LM4562 very forgiving in application and didn't need any special tricks or power supply requirements so tended to drop straight in without hassles. I've had it running with various voltages from 5V to 15V. There's something very neutral about this op amp that doesn't get in the way like most others. Most of the others have good sonics in various areas but there was always a down side... that included the Burson op amp as can be a bit over blown in certain applications. The LM4562 may not be the best op amp in the world but works extremely well for my needs and tastes.
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Last edited by rabbitz; 18th February 2010 at 11:41 AM. Reason: whoops
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Old 18th February 2010, 11:24 AM   #10
rabbitz is offline rabbitz  Australia
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Quote:
Originally Posted by pcsl999 View Post
Look...
½ҳ 1

China guy copy & develop HDAM Module... price USD12 ~ 30....
It's not known who came up with the module first and each claim it was their work. It doesn't matter as they are very good whether Burson or Audio-GD. Burson have recently redesigned theirs.
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