Jump to content

Sign in to follow this  
Ozcall

And for my next dac.

Recommended Posts

Hi guys this is my next project :

Ok , so I know I said my last dac was my last dac but I discovered a rather inexpensive 'recipe' for theoretically very high quality audio.
It is all based on a dac called the DSC which the designer provided the circuit free to the diy community. Those clever Chinese have (legally) followed the design to provide a board with usb input at a very good price.
This dac only works with DSD signals but if you add an upsampling hardware board into the mix you can upsample all your music to DSD and in theory get excellent sound quality.
The dac board costs $200 shipped and that includes an Amanero usb board. No additional output board is necessary as the dac already has transformer based output. The cost of the upsampler board is around $100. I already have all the power transformers from a retired older project and 4 very low noise power supplies cost me under $60.
The upsampler board also adds : BNC , RCA , XLR and optical input so even disc spinners are catered for.
Should have all the parts by the end of the month so fun times ahead.

 

 

 

 

 

 

Amanero-usb-iis-Support-DSD512-384K-32Bit-Free-Shipping.jpg

DSC.jpg

29258114_10155060865737434_2167986080922811312_n.jpg

Edited by Ozcall

Share this post


Link to post
Share on other sites
1 minute ago, Muon N' said:

You must have a fair bit of DAC experience by now :thumb:

Yep , getting there. :)

Have built many dacs from kits/modules the most successful of which have been the TDA1541 with Lampinzator tube output stage and my current Ak4495 dual dac with Singxer F1 on usb.

Share this post


Link to post
Share on other sites

Cool, Gordon!

 

My fav' old DAC, and for modern i do like the AKM's.......... I have butchered a few in my time :)

 

I should talk to you about Lampi' tube output stages at some point :cool:

 

Share this post


Link to post
Share on other sites


22 minutes ago, davewantsmoore said:

Oooh, I might have a go at this too  :)

Superb.

Have a look at the thread on DIY audio : http://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-70.html#post5377811

loads on info and also the opportunity to buy an upgraded version DSC2.6 but only as a bare pcb at the moment, which requires smd soldering skills.

I have had a chat with 'ppy' who has designed the new boards and he recommends changing  the 600:600 ohm transformers for 10k:10k on the Chinese board. The Chinese DSC1 board can be bought without the 600ohm trafo's for a lower price and the 10k trafos are available on Aliexpress for $45us. 

https://www.aliexpress.com/item/2PCS-10K-10K-permalloy-audio-isolation-transformer-balanced-and-unbalanced-conversion-audio-isolator/32810421236.html?spm=a2g0s.9042311.0.0.Sefg01

If you need other links just let me know.

Share this post


Link to post
Share on other sites


This looks very interesting. can't wait to hear how it sounds.

Share this post


Link to post
Share on other sites
26 minutes ago, niss_man said:

This looks very interesting. can't wait to hear how it sounds.

Even my Gales don't go that loud Simon :)

Share this post


Link to post
Share on other sites

I'm currently in the final stages of this rebuild and modification of a old 90's QED Digit dac. I interfaced a USB to i2s board directly to the dac chip. Split the power supplies and swapped out the opamp. Built a SE to balanced output (this is the only part that needs to be completed). Did a heap of other mods, including bumping up the sampling rate to 48Khz. I'm extremely impressed with performance, puts a lot of my other gear to shame. Great little USB to is2 board, gotta love some of what these Chinese are making, and for the price they do it!!

IMG_0305.JPG

IMG_0307.JPG

Edited by Benjet

Share this post


Link to post
Share on other sites


I'll be following this with interest. I'm toying with the idea of upsampling a PCM signal in a microcontroller and outputting it as DSD (or so). But too many things in my head and on my hands at the moment.

 

Cheers,

 

Alberto

Share this post


Link to post
Share on other sites
I'll be following this with interest. I'm toying with the idea of upsampling a PCM signal in a microcontroller and outputting it as DSD (or so). But too many things in my head and on my hands at the moment.
 
Cheers,
 
Alberto

Interesting thought, what are you trying to achieve with the upsampling?

Share this post


Link to post
Share on other sites

It's not really upsampling... I guess... The idea is to try to avoid the commercial DAC chip, and just filter the DSD signal with an analog circuit to see how that works and hear how it sounds. First step I have in mind is do a differential class D output from the microcontroller using the digital 24bit PCM samples as reference rather than the analog input. See how that behaves, and then move on to more complex 1 order and 2nd order delta sigma modulators.

 

In the end the goal is for the micro to output a serial 1-0 bit stream at roughly 6MHz and filter that to recover the audio signal.

 

Mind you, it all may go down the toilet with discreet components and op-amps. And like I said, I still have to start it...,

 

Cheers,

 

Alberto

Share this post


Link to post
Share on other sites
2 hours ago, betocool said:

It's not really upsampling... I guess... The idea is to try to avoid the commercial DAC chip, and just filter the DSD signal with an analog circuit to see how that works and hear how it sounds. First step I have in mind is do a differential class D output from the microcontroller using the digital 24bit PCM samples as reference rather than the analog input. See how that behaves, and then move on to more complex 1 order and 2nd order delta sigma modulators.

 

In the end the goal is for the micro to output a serial 1-0 bit stream at roughly 6MHz and filter that to recover the audio signal.

 

Mind you, it all may go down the toilet with discreet components and op-amps. And like I said, I still have to start it...,

 

Cheers,

 

Alberto

That's a different approach, bit out of my league, but I see what you are trying to achieve. Keep us in the loop if you decide to give it a whirl.

Share this post


Link to post
Share on other sites


I am still waiting for the upsampler board to arrive but I decided to make a start on the dac power supplies . The R-cores were custom made for another project (now retired) but are the right voltages for this project after 2 stages of regulation .The big power supply board , in the middle also came from the old project. The smaller power supply on the left drops the voltage down to the required 5v x2 for the left and right chns of the dac and a 3rd 5 v powersupply which is used to power the muting relays comes direct from the big board. A further 5v power supply to feed the SRC  board will also come from the big board via a lt3045 regulator mounted at the power input of the SRC board. I plan to add a further 2 lt3045 regs ,one for each channel of the dac board as fund become available.

29665018_10155093341617434_854953618931576849_o.jpg

Edited by Ozcall

Share this post


Link to post
Share on other sites

Well!  today was a busy one but I managed to complete the initial build of the new dac :

20180403_164615.jpg

20180403_164623.jpg

20180403_164623.jpg

Pity the cable for the display is too short but a quick trip to Jaycar tomorrow should resolve that issue.

I still have to connect the RCA coax input and the outputs but it all seems to test well and runs cool.

Initially single ended output direct from the transformer will be used but I have 2 different valve based balanced to single ended  converters to try later on.

Edited by Ozcall

Share this post


Link to post
Share on other sites

Hey guys , the new dac was finished half an hour ago and first impressions suggest it might be a winner.

Going to run it in over night and have a good listen tomorrow.

Stay tuned :)

Share this post


Link to post
Share on other sites

Well ,yesterday was just down right painful. After listening again to the new dac with upsampled cd I set about flashing the Amanero board and installing the drivers. Win10 allowed the drivers to be installed but the device didn't show up until I manually reinstalled it via the 'add legacy hardware' option in Device manager. So at that point the Anamero was showing up in the sound applet and was set as default, Using Spotify the little level meter in the sound applet was dancing up and down  but there was no sound output from the dac. Jriver would not play nice either and kept saying there was a problem with playback when the Amanero was used as the output device.

Took the dac up to my work room to reflash the Amanero and started to smell that electrical overheating smell and sure enough one of the Lt1083 regs was getting too hot.

Then I ran out of solder , then my desoldering iron started to be have erratically.

I gave up at this point and went and had a few wines.......

This morning I ordered a new psu , slightly different design and in kit form so I don't have to desolder anything. Solder ordered too.

Now to dismantle the desoldering  gun and try and fix it.

BOOOOOOO!

 

 

Edited by Ozcall

Share this post


Link to post
Share on other sites

Excellent project- well done!

With the Amanero I find 1099c firmware a good alrounder.

In JRiver ASIO driver works best for me

Good luck on the desoldering gun repair.

PS love those copper shrouded R-cores.

Edited by Gieseler Audio

Share this post


Link to post
Share on other sites
23 hours ago, Ozcall said:

Well ,yesterday was just down right painful. After listening again to the new dac with upsampled cd I set about flashing the Amanero board and installing the drivers. Win10 allowed the drivers to be installed but the device didn't show up until I manually reinstalled it via the 'add legacy hardware' option in Device manager. So at that point the Anamero was showing up in the sound applet and was set as default, Using Spotify the little level meter in the sound applet was dancing up and down  but there was no sound output from the dac. Jriver would not play nice either and kept saying there was a problem with playback when the Amanero was used as the output device.

Took the dac up to my work room to reflash the Amanero and started to smell that electrical overheating smell and sure enough one of the Lt1083 regs was getting too hot.

Then I ran out of solder , then my desoldering iron started to be have erratically.

I gave up at this point and went and had a few wines.......

This morning I ordered a new psu , slightly different design and in kit form so I don't have to desolder anything. Solder ordered too.

Now to dismantle the desoldering  gun and try and fix it.

BOOOOOOO!

 

 

Yep, sometimes you just call it a day and chill out.

 

I hope you had some alternatives to listen to something.

 

Good luck!

 

Alberto

Share this post


Link to post
Share on other sites
4 hours ago, betocool said:

Yep, sometimes you just call it a day and chill out.

 

I hope you had some alternatives to listen to something.

 

Good luck!

 

Alberto

Thanks Alberto , thankfully I still have my diy dual 4495 dac and the dac inside the Linn Unidisk SC ( which is also very good).Anyway , more solder ordered, converting the desoldering iron to be just a powered solder sucker and trying to decide which linear psu to by to drop the voltage from 12v to 5. :)

 

Edited by Ozcall

Share this post


Link to post
Share on other sites
22 hours ago, Gieseler Audio said:

Excellent project- well done!

With the Amanero I find 1099c firmware a good alrounder.

In JRiver ASIO driver works best for me

Good luck on the desoldering gun repair.

PS love those copper shrouded R-cores.

No idea what happened but I did reply to you Clay and the post was there but now it is gone. Might just pm you anyway. :)

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...