DSD DAC
All currently produced DSD DAC chips, including the DSD1794, convert DSD to PCM before conversion to analog.
My guess is that Doede’s design will use an Amanero or WaveIO USB converter to provide left and right DSD signals that will be delayed into a set of parallel time shifted 1-bit signals that will be individually filtered and combined into an analog buffer.
All currently produced DSD DAC chips, including the DSD1794, convert DSD to PCM before conversion to analog.
My guess is that Doede’s design will use an Amanero or WaveIO USB converter to provide left and right DSD signals that will be delayed into a set of parallel time shifted 1-bit signals that will be individually filtered and combined into an analog buffer.
well that sounds like funbtw did you try any tracks from my cloud ?
sure I did ! thanks again
Along with good I/V resistors and a nice solution for handling the DC offset at the output, I would say so, yes. Also worth considering: it seems there are some good gains to be had from swapping out the 6K resistor that goes to pin 20 and acts as a current reference and instead installing a simple (cheap) current regulator here. But this is a fairly recent discovery here and there are a few different options so people are trying them out and comparing them now.
If I remember correctly 60mA is what the Tents shunts, that Guido supplies specificly for the DDDAC, are set up for.
I don't know how that translates into the sink value for the Belleson. Best to contact them about this.
Good question. Let’s start that list. Here’s my personal “Bang for a Buck” list in descending order (in my experience). Anybody, obviously feel free to comment, or add your own. I’m sure opinions will differ.
1. Run the DDDAC floating/balanced, with no output caps, if DC off-set allows this (0 cost)
2. Remove 100Kohm at the RCA outputs, if you can (0 cost)
3. Add HF filter caps at output, (x2) (+/-5$USD)
4. Change Vcom side 47uf caps to Os-con or Silmic’s (x4) ( *+/-10$USD)
5. Change Vdd side 47uf to Os-con’s (x2) (*+/- 5$USD)
6. Shunts 8V analogue Vcc supply (2x) (*+/-100$USD)
7. Upgrade I/V resistors (x4) (AN Tantilum’s 2W, *+/- 50$USD)
8. Separate 5V power WaveIO board (*+/- 50-100$USD)
9. Unregulated 12V powersupply (*+/- 200$USD)
10. Add extra DDDAC boards, (price depending on above options,*+/-100-210$USD, each)
11. Alternative caps scheme’s…. (to taste..)
Things I personally haven’t tried/implemented:
12. Shunts 3.3 digital Vdd supply
13. CCS at pin 20
14. Cinemag/Sowther/fancy cap, at output (I did try Cinemag’s & 2.2uf Auricap's, but didn’t like them)
(* prices are rough estimated per board)
Did I miss anything?
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Good question. Let’s start that list. Here’s my personal “Bang for a Buck” list in descending order (in my experience). Anybody, obviously feel free to comment, or add your own. I’m sure opinions will differ.
1. Run the DDDAC floating/balanced, with no output caps, if DC off-set allows this (0 cost)
2. Remove 100Kohm at the RCA outputs, if you can (0 cost)
3. Add HF filter caps at output, (x2) (+/-5$USD)
4. Change Vcom side 47uf caps to Os-con or Silmic’s (x4) ( *+/-10$USD)
5. Change Vdd side 47uf to Os-con’s (x2) (*+/- 5$USD)
6. Shunts 8V analogue Vcc supply (2x) (*+/-100$USD)
7. Upgrade I/V resistors (x4) (AN Tantilum’s 2W, *+/- 50$USD)
8. Separate 5V power WaveIO board (*+/- 50-100$USD)
9. Unregulated 12V powersupply (*+/- 200$USD)
10. Add extra DDDAC boards, (price depending on above options,*+/-100-210$USD, each)
11. Alternative caps scheme’s…. (to taste..)
Things I personally haven’t tried/implemented:
12. Shunts 3.3 digital Vdd supply
13. CCS at pin 20
14. Cinemag/Sowther/fancy cap, at output (I did try Cinemag’s & 2.2uf Auricap's, but didn’t like them)
(* prices are rough estimated per board)
Did I miss anything?
That looks pretty comprehensive to me. I did try the Mundorf silver/gold caps and Cinemags but prefer your (1) above to either of those. I have a second set of outputs with caps using Mundorf film foil as I sometimes need to run the Dac into amps where offset is a problem. YMMV
Good question. Let’s start that list. Here’s my personal “Bang for a Buck” list in descending order (in my experience). Anybody, obviously feel free to comment, or add your own. I’m sure opinions will differ.
1. Run the DDDAC floating/balanced, with no output caps, if DC off-set allows this (0 cost)
2. Remove 100Kohm at the RCA outputs, if you can (0 cost)
3. Add HF filter caps at output, (x2) (+/-5$USD)
4. Change Vcom side 47uf caps to Os-con or Silmic’s (x4) ( *+/-10$USD)
5. Change Vdd side 47uf to Os-con’s (x2) (*+/- 5$USD)
6. Shunts 8V analogue Vcc supply (2x) (*+/-100$USD)
7. Upgrade I/V resistors (x4) (AN Tantilum’s 2W, *+/- 50$USD)
8. Separate 5V power WaveIO board (*+/- 50-100$USD)
9. Unregulated 12V powersupply (*+/- 200$USD)
10. Add extra DDDAC boards, (price depending on above options,*+/-100-210$USD, each)
11. Alternative caps scheme’s…. (to taste..)
Things I personally haven’t tried/implemented:
12. Shunts 3.3 digital Vdd supply
13. CCS at pin 20
14. Cinemag/Sowther/fancy cap, at output (I did try Cinemag’s & 2.2uf Auricap's, but didn’t like them)
(* prices are rough estimated per board)
Did I miss anything?
Great list thank you!
Can you share links for these caps so we can see the exact ones please?
4. Change Vcom side 47uf caps to Os-con or Silmic’s (x4) ( *+/-10$USD)
5. Change Vdd side 47uf to Os-con’s (x2) (*+/- 5$USD)
Hi Simon, these are the ones I used:
Os-con's, Mouser.com artikel nr.:667-20SEQP47M
Silmic's, Mouser.com artikel nr: 555-RFS25V470MG3#5
8V Vregs
Stijn001,
I am a big fan of Bellesons on digital circuits with the proper modifications, but I feel that a Salas or Tent Shunt might be a better choice for the analog circuits. The one time a used a Belleson on an analog buffer circuit I didn't care for the sound until I put a Bybee Music Rail after it.
I use Salas Shunts on all my DIY analog projects where heat is not an issue and love the results. A single Salas Shunt in my DDDAC running at 250ma provides 8V to both PCM1794 chips. The Salas shunt is too large to sit on the DAC because it contains its own rectification. IMO closeness of Vregs to digital use points is much more important than for analog use points.
Stijn001,
I am a big fan of Bellesons on digital circuits with the proper modifications, but I feel that a Salas or Tent Shunt might be a better choice for the analog circuits. The one time a used a Belleson on an analog buffer circuit I didn't care for the sound until I put a Bybee Music Rail after it.
I use Salas Shunts on all my DIY analog projects where heat is not an issue and love the results. A single Salas Shunt in my DDDAC running at 250ma provides 8V to both PCM1794 chips. The Salas shunt is too large to sit on the DAC because it contains its own rectification. IMO closeness of Vregs to digital use points is much more important than for analog use points.
Hi Carlsor,
Though I do not satisfied with Guido with regards to his poor service and customer relation, I no doubt think the Tent Shunts in collaboration with my unregulated choke input raw PS have giving me Goosebumps to this DDDAC. The collaboration from this combination, so far, is not thing short from amazing! I dare say it will be a pleasant surprise if those keen to bring their $30k+ Vinyl gig for a shootout!
If Doede can revise the DAC board with shunt regulators will definitely eliminate a layer if frustration from Tent Lab.
Personally, I would not deal with Tent Shunt again if I happen to start from scratch!
Many thanks,
Chanh
Though I do not satisfied with Guido with regards to his poor service and customer relation, I no doubt think the Tent Shunts in collaboration with my unregulated choke input raw PS have giving me Goosebumps to this DDDAC. The collaboration from this combination, so far, is not thing short from amazing! I dare say it will be a pleasant surprise if those keen to bring their $30k+ Vinyl gig for a shootout!
If Doede can revise the DAC board with shunt regulators will definitely eliminate a layer if frustration from Tent Lab.
Personally, I would not deal with Tent Shunt again if I happen to start from scratch!
Many thanks,
Chanh
Vregs
Customer service from Belleson and Salas (tea-bag) is first class.
Comparing the properly implemented Belleson versus the Tent versus the Salas is like comparing super-model women or Ferrari vs. Lamborghini - they all give you the ride of your life! - or so I've read. At times musicians step out of the speakers into my room - too real! In addition to Bellesons and Salas Shunts right now I also use cascoded JFET CCSs and output buffers. The Cinemags no longer sound wimpy but deliver solid bass and detail.
Customer service from Belleson and Salas (tea-bag) is first class.
Comparing the properly implemented Belleson versus the Tent versus the Salas is like comparing super-model women or Ferrari vs. Lamborghini - they all give you the ride of your life! - or so I've read. At times musicians step out of the speakers into my room - too real! In addition to Bellesons and Salas Shunts right now I also use cascoded JFET CCSs and output buffers. The Cinemags no longer sound wimpy but deliver solid bass and detail.
like to point you to a thread where someone is doing listening evaluation on some psu caps. as there are quite some experiments over here, I thought this might interest some of you
never mind the very negative comments from some other DIY
http://www.diyaudio.com/forums/power-supplies/261836-some-electrolytic-caps-shootout.html
never mind the very negative comments from some other DIY
http://www.diyaudio.com/forums/power-supplies/261836-some-electrolytic-caps-shootout.html