Thanks Miro for the bit rate issue, looking forward to your findings and research
Thanks Vunce, that adapter board is too much for with the smd soldering and piggy back. I will live with LM6171 for now till I get hold of some of those adapters pre-soldered with the opamps 😉
Thanks Vunce, that adapter board is too much for with the smd soldering and piggy back. I will live with LM6171 for now till I get hold of some of those adapters pre-soldered with the opamps 😉
Yes, you can use these electrolytic caps 🙂 What is your power supply?
It will be a simple supply
DC -> 4700uF -> 10 Ohm -> 4700uF||100nF -> LM317 -> 10uF||100nF -> DAC Board
Same schema, but with 337 for negative rails
Digital and Analogue supplies are fed from different transformer taps
Thanks
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@har297
add 0.22R or 0.33R after LM317/337 ... it will increase the stability for those regulators 🙂
DC -> 4700uF -> 10 Ohm -> 4700uF||100nF -> LM317/337 -> 0.33R -> 10uF||100nF -> DAC Board
add 0.22R or 0.33R after LM317/337 ... it will increase the stability for those regulators 🙂
DC -> 4700uF -> 10 Ohm -> 4700uF||100nF -> LM317/337 -> 0.33R -> 10uF||100nF -> DAC Board
Is the OPA1656 compatible with this board as I see some of them using it? But when I check, it says 2 channel but the Miro's dac board is compatible only with 1 channel opamp per side. Here is the one I am planning to get OPA1656ID Texas Instruments | Mouser.
Thanks
We talk about that in the thread, same with opa861 and all not pins compatible aops like the non single ones : it needs some diy and care with decoupling. We also talked about discrete and EUVL even gave us a discrete scheme 😎🙂.
@miro1360
thanks for the tip, i will add it 🙂
Do you feel 317/337 is better or 78xx and 79xx regs are better in this design.
Although you recommend both of these in your design.
I was curious on digital and analogue aspects.
Thanks
thanks for the tip, i will add it 🙂
Do you feel 317/337 is better or 78xx and 79xx regs are better in this design.
Although you recommend both of these in your design.
I was curious on digital and analogue aspects.
Thanks
@har297
add 0.22R or 0.33R after LM317/337 ... it will increase the stability for those regulators 🙂
DC -> 4700uF -> 10 Ohm -> 4700uF||100nF -> LM317/337 -> 0.33R -> 10uF||100nF -> DAC Board
Idem for the 78xx/79xx regs : they needs it at their output. I prefer to use an hold lytics between 47 to 220 uF there that has lost its characteristic, i.e. that now shows very bad esr instead of the resistor !
I liked the old Nichicon Vs or Vx caps for the job I get from old CD players boards.
so with that regs what works fine is : low esr at the input side near the legs (a standard good modern lytic, Simic 2, Panasonic, Nichicon, what suits your tastes) and the bad old cap at the reg output. Then near the load the low capacitance decoupling in the nF and few uF range, // if you want.
For the DC rectifier that can be far from the reg sometimes : This gave me rxcelent results if we take the Miro1360 example CRC : 4700 uF-1 to 10 ohms-4700//1200 or 800 uF.... imho the 100 nf should be more on the legs of the talked regs at their input (Vin-Gnd)...
Anyway , trust your ears, experiments are fun (as sims with power supplies)
Ok guys, I already tested AD1862 with the same glue-logic on jlsounds (32b/384kHz) and diyinhk xmos (24b/192kHz). easyDAC ... it has the same schematic for AD1862 and it’s data input.
I used 10cm data wires. R1=R2=R3=0R (it should work with other values too)
It worked perfect on diyinhk xmos:
16b: 44.1, 48, 88.2, 96, 176.4, 192 kHz
24b: 44.1, 48, 88.2, 96, 176.4, 192 kHz
(my diyinhk xmos can’t go higher, it’s an older version)
It worked perfect on older jlsounds xmos (with heatsink 😀) :
16b: 44.1, 48, 88.2, 96, 176.4, 192 kHz
24b: 44.1, 48, 88.2, 96, 176.4, 192 kHz
32b: 44.1, 48, 88.2, 96, 176.4, 192 kHz
It failed (distorted) on jlsounds xmos:
16b: 352.8, 384 kHz
24b: 352.8, 384 kHz
32b: 352.8, 384 kHz
... it would fail on any xmos from the frequency 352.8kHz and higher
... so the limit is 192kHz
I will test this PCB in the future because I haven't soldered it yet 😀
I used 10cm data wires. R1=R2=R3=0R (it should work with other values too)
It worked perfect on diyinhk xmos:
16b: 44.1, 48, 88.2, 96, 176.4, 192 kHz
24b: 44.1, 48, 88.2, 96, 176.4, 192 kHz
(my diyinhk xmos can’t go higher, it’s an older version)
It worked perfect on older jlsounds xmos (with heatsink 😀) :
16b: 44.1, 48, 88.2, 96, 176.4, 192 kHz
24b: 44.1, 48, 88.2, 96, 176.4, 192 kHz
32b: 44.1, 48, 88.2, 96, 176.4, 192 kHz
It failed (distorted) on jlsounds xmos:
16b: 352.8, 384 kHz
24b: 352.8, 384 kHz
32b: 352.8, 384 kHz
... it would fail on any xmos from the frequency 352.8kHz and higher
... so the limit is 192kHz
I will test this PCB in the future because I haven't soldered it yet 😀
@miro1360
...
Do you feel 317/337 is better or 78xx and 79xx regs are better in this design.
...
78xx/79xx are not all the same ... the best experience are those from onSemi: MC78xx/MC79xx
there are different approaches on how to connect LM317/337 ... try the connection without TL431, just with simple resistors
what sounds better is hard to say for me ... I like both 😀
as @diyiggy said, do a comparison and tell us your results 😀
In order to use a dual opamp with Miro’s Dac board, the second opamp channel needs to be dealt with properly. I had an adapter board designed following TI’s recomendation. I’m currently using OPA1656 opamps.
Thanks Vunce for your schematic, it is helpful 🙂
So it's maybe the Rpi despite the Fifo after, I thought it was not proof at 388 sample rate, but maybe even 192Kz is too much ? If someone has a Rpi with the board and could add an inputt about that ?
@ har917 (the LM317 is well known to have very low noise, less than the 78 family, and easy to use, there are of course tons of good better regs nowadays, but damn for the price of it they are hard to beat and enough in many analog applications, but notice I'm not electronician as Miro1360 is....
Something defintly cool to read is what Nazar member wrote in him blog here at Diyaudio about fast regs with the LM317/337 : could be also a good cheap enough reg for the aop with only 1 to 2 uf with 100 nF with the fastest oaps on their legs of the discussed list... for the digital side Miro said the AD1862 had very low noise regs inside so a proper decoupled 79/78xx regs from On Semi is certainly good enough -as NJR ones?- .... want to improve ? just buy a R-Core traffo instead a torroid; there is in India a good supplier of R-Core but I don't remember the name , sorry)
@ har917 (the LM317 is well known to have very low noise, less than the 78 family, and easy to use, there are of course tons of good better regs nowadays, but damn for the price of it they are hard to beat and enough in many analog applications, but notice I'm not electronician as Miro1360 is....
Something defintly cool to read is what Nazar member wrote in him blog here at Diyaudio about fast regs with the LM317/337 : could be also a good cheap enough reg for the aop with only 1 to 2 uf with 100 nF with the fastest oaps on their legs of the discussed list... for the digital side Miro said the AD1862 had very low noise regs inside so a proper decoupled 79/78xx regs from On Semi is certainly good enough -as NJR ones?- .... want to improve ? just buy a R-Core traffo instead a torroid; there is in India a good supplier of R-Core but I don't remember the name , sorry)
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Ok guys, I already tested AD1862 with the same glue-logic on jlsounds (32b/384kHz) and diyinhk xmos (24b/192kHz). easyDAC ... it has the same schematic for AD1862 and it’s data input.
I used 10cm data wires. R1=R2=R3=0R (it should work with other values too)
I will test this PCB in the future because I haven't soldered it yet 😀
Thanks Miro, I have set R1=R2=R3=0R resistor and tested this via my Pi3 running Ropieeexl as Roon transport. I get the distortion when I play 24bit/192khz file as soon as it starts. Did you try the above check via Pi?
I have raspberry pi 3b and hifiberry dac+ pro running ropieee. Miros board is connected to i2s output off hifiberry dac and I can play 24bit 192kHz without any distortions.
Interesting! I will try that later, after setting up roon account. What settings did you use in Roon so that I can replicate a similar setup?
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I have raspberry pi 3b and hifiberry dac+ pro running ropieee. Miros board is connected to i2s output off hifiberry dac and I can play 24bit 192kHz without any distortions.
Thanks let me try it again and see if my setup has some issues with the settings.
Interesting! I will try that later, after setting up roon account. What settings did you use in Roon so that I can replicate a similar setup?
In roon I have DSD over PCM max sample rate 192kHz, max bits per sample 24 this is max for hifiberry and I have no other higher choices only lower. I can than play some audiophile speaker setup album that has 192kHz and 24bit tracks... and on ropieee it is selected raspberry pi DAC i2s...
...
Did you try the above check via Pi?
Nice build!
I have not. No RPi in my house yet 😀
Anyway, @Ripster tried RPi 3B and he claims it works (but his setup can be different from yours, I have a lack of experience with rpi ... try ropieee instead of moode and configure it for the hifiberry dac+ pro as @Ripster said).
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