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tda1387 dac pcb "front end"
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Old 20th May 2019, 06:46 PM   #481
twocents is offline twocents  South Africa
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tda1387 dac pcb "front end"
And this is how my DAC looks now in a very basic open enclosure. I have two outputs - one to my main amp and one to my headamp. But for me it is not about the looks or the enclosure - but the sound. I still love the sound!
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Old 20th May 2019, 06:56 PM   #482
pcgab is online now pcgab  United States
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tda1387 dac pcb "front end"
Quote:
Originally Posted by twocents View Post
And this is how my DAC looks now in a very basic open enclosure. I have two outputs - one to my main amp and one to my headamp. But for me it is not about the looks or the enclosure - but the sound. I still love the sound!
Looks great to me, clean, simple and functional!
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Old 20th May 2019, 08:36 PM   #483
matt_garman is offline matt_garman  United States
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tda1387 dac pcb "front end"
Quote:
Originally Posted by vipulpatel83 View Post
I need some help to understand the connections J4 -> Amanero :

1. I am confused with I2S_WS (from the schematics), if its to be connected to CLK or FSCLK on Amanero?
2. Also, as per schematics, 1-3-5 pins on J4 are to be connected GND. Did you connect all of these to Amanero GND pins.
twocents is right, use Amanero's FSCLK pin to connect to I2S_WS.

The intent of having three ground pins is so you can run each I2S wire as a signal+ground twisted pair. You don't have to do that, but I've seen it done before, so my intent was to make it possible if you wanted to.

Hope that helps!


Quote:
Originally Posted by twocents View Post
And this is how my DAC looks now in a very basic open enclosure. I have two outputs - one to my main amp and one to my headamp. But for me it is not about the looks or the enclosure - but the sound. I still love the sound!
You said it's not about the looks, but it looks pretty darn nice to me! If that's your unclean look, your clean work must be absolutely exquisite!

Either way, I'm glad you like the sound, that is the most important part! I can't tell you how rewarding it is to see others get value out of something I made.

Thank you for sharing!
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Old 27th May 2019, 06:51 PM   #484
stellarelephant is offline stellarelephant  United States
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Hi twocents, nice work there! Can you explain a bit more about your PSU setup? I see two JPS64 boards (XRK's design?) and a little boost module in the case. How is the noise performance? Also curious if you have compared the SQ of the RPi stack with your earlier Amanero-fed setup.
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Old 28th May 2019, 01:47 PM   #485
twocents is offline twocents  South Africa
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tda1387 dac pcb "front end"
My setup has changed slightly since the last photo (in the post above) and I would not know how good/bad (or noise free) it really is – I cannot measure it or compare it to something else. I am not so clued up on low noise, linear vs smps PSUs. I simply used what I had in hand, and yes, I use two JPS64 PSU boards which I got as a generous gift from member xrk971. In fact, I received so many generous gifts for this project, including the HAT DAC board from Matt Garman, the Raspberry Pi 2B and the TPS7A4701 LDO from fellow audio friends. The Low-Noise PSU boards can be ordered here:
GB for Simple Cap-Mx Regulated Low-Noise PSU
And one can play around with different regulators using this board.

The little booster board in the photo is actually a DC-DC step down converter I used initially for testing before the PSU boards were up and running. It serves no purpose here and I have since removed it. I now have the the two Low-Noise PSU boards, each one fed from its own smps as follows:
Samsung 14V 1.8A smps -> PSU board with a LT1085CT-5 regulator and larger 2A inductor -> Rpi (via the GPIO pins)
Netgear 19V 1A wallwart -> PSU board with a TPS7A4701 LDO regulator -> HAT DAC board

Using this setup with my PCA headamp it is absolutely quiet- no hint of any noise on full volume. This DAC sounds best with this Class A amp and headphones. Absolutely gorgeous.
With my ACA + Aksa Lender preamp this setup is also dead quiet, but with my TDA7297 amp + B1 buffer I have ground loop issues and lots of noise.

Because I use such a mixture of different kinds of smps supplies to power each component, I have found that ground loop issues (or noise) are a result of this mix, since some supplies have an earth connection and some don’t. I am seriously planning on building an AC Filter, more info here:
AC filterr DIY ESA SILK
and here:
Mains Filter - diyAudio
What I like about this setup is that you can implement a switch for each AC outlet to either enable or disable the earth connection. This makes it easy to play around with different combinations to eliminate ground loop issues. Once I have built and connected all my goodies one day – preamp, Class A amp, Class D amp, Headamp, Rpi, DAC, Bluetooth receiver and active crossover – I will have 8 different supplies! Where will I hide them? What will my wife say?

With regards to SQ between the Amanero and Rpi stack – I cannot really say. I used the Amanero initially just as a quick test to see if the DAC works before plugging it into the Rpi. First impressions last and this DAC really sounded fantastic the first time it worked with the Amanero. But there was some noise that I could not have lived with using the Amanero like that. I guess it also depends on the source used. I used my Android phone and the Amanero was not grounded either.
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Old 29th May 2019, 08:57 PM   #486
stellarelephant is offline stellarelephant  United States
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Twocents,
Thanks for your report. Very cool that you have successfully repurposed those switching supplies for audio use using the LDO boards. No doubt you are getting quiet performance, as I have seen X's excellent noise measurements for that PSU board. I have had some fun listening to this DAC through my PCA headphone amp as well. The effortless dynamics from that combo is incredible.

I am trying to learn more about AC filtering as well. I tried a CLC filter on the mains in front of my DAC but didn't notice a change. I know I have read somebody recommend against ferrite chokes on AC wires for audio due to magnetic field interaction. I do have snap-on ferrites on my DC supply wires, and i think they might help a smidgen.
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