DCAudioDIY.com

DC Area Audio DIYer's Community
It is currently October 31st, 2024, 7:57 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 37 posts ]  Go to page Previous  1, 2, 3, 4  Next
Author Message
PostPosted: November 9th, 2017, 6:40 pm 
Offline
User avatar

Joined: January 13th, 2016, 9:14 pm
Posts: 870
First mod to the stock board after listening will be to short out the 2 - 100uF coupling caps from the DAC. The DAC uses switched capacitor filters and has no DC offset.

With the 49720 dual opamp, should be no need for the coupling caps.


Top
 Profile  
 
PostPosted: November 9th, 2017, 7:36 pm 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1747
Location: Parkville, Maryland
HAL wrote:


No schematic? How can you guys apply a DIY device without a schematic?

_________________
Walt


Top
 Profile  
 
PostPosted: November 9th, 2017, 10:10 pm 
Offline
User avatar

Joined: January 13th, 2016, 9:14 pm
Posts: 870
There is an output stage schematic and I2S Bus input diagram and AK4497 data sheet. All I need.


Top
 Profile  
 
PostPosted: November 10th, 2017, 10:06 am 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1747
Location: Parkville, Maryland
HAL wrote:
There is an output stage schematic and I2S Bus input diagram and AK4497 data sheet. All I need.


That's what I'd like to look at. Also, the number of the IC op-amp used in the output.

_________________
Walt


Top
 Profile  
 
PostPosted: November 10th, 2017, 11:58 am 
Offline

Joined: July 17th, 2016, 6:24 am
Posts: 1126
HAL wrote:
First mod to the stock board after listening will be to short out the 2 - 100uF coupling caps from the DAC. The DAC uses switched capacitor filters and has no DC offset.

With the 49720 dual opamp, should be no need for the coupling caps.


AK4497 chip itself is about $52 on Mouser. They are selling the finished DAC with all the bells and whistles for $116. Not financially feasible. Most likely all the components including the opamps are cheap Chinese imitations.


Top
 Profile  
 
PostPosted: November 10th, 2017, 6:49 pm 
Offline
User avatar

Joined: January 13th, 2016, 9:14 pm
Posts: 870
As long as the pc board functions, getting a known AK4497EQ and better opamps since they are socketed.


Top
 Profile  
 
PostPosted: November 13th, 2017, 9:36 am 
Offline
User avatar

Joined: January 13th, 2016, 9:14 pm
Posts: 870
Even the AK4490EQ board I have that was $26 has a $5 DAC ship in low quant. The chip price drops by half in quantity.

The AK4497EQ in quantity is $44 at Digikey for a $118 board. Still may be fake or a second, so will see what happens.

Now to get some power supplies resurrected.


Top
 Profile  
 
PostPosted: November 13th, 2017, 10:28 am 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1705
There seem to be three different AK4497 boards available on e-bay. One of them uses two AK4497s, the other two only one. What made you pick this board over the other two?

Shashi - Which one do you have?

Roscoe

_________________
I can explain it to you, but I can’t understand it for you.


Top
 Profile  
 
PostPosted: November 13th, 2017, 11:10 am 
Offline
User avatar

Joined: January 13th, 2016, 9:14 pm
Posts: 870
Roscoe,
The one I have comes with the AK4497 installed. The others are boards close in price for dual AK4497's comes without the DAC chips. You have to buy and install them.

Unless you can do SMD soldering, you have a non-working board.


Top
 Profile  
 
PostPosted: November 13th, 2017, 11:22 am 
Offline

Joined: July 17th, 2016, 6:24 am
Posts: 1126
Roscoe Primrose wrote:
There seem to be three different AK4497 boards available on e-bay. One of them uses two AK4497s, the other two only one. What made you pick this board over the other two?

Shashi - Which one do you have?

Roscoe


I have the board from DIYINHK. I had the Chinese dual mono AK4495 DAC which failed with Burson mono opamps. To my ears, DIYINHK stereo AK4495 DAC sounded better than the ebay dual mono. I am going to stay away from Chinese DACs on eBay.

Next spring I am planning to get into DIY dual mono AK4497 DAC.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 37 posts ]  Go to page Previous  1, 2, 3, 4  Next

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: Bing [Bot] and 7 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group