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DAC AD1862: Almost THT, I2S input, NOS, R-2R
DAC AD1862: Almost THT, I2S input, NOS, R-2R
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Old 26th November 2020, 02:33 PM   #1141
manniraj is offline manniraj  India
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Join Date: Nov 2012
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
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Old 26th November 2020, 03:54 PM   #1142
har297 is offline har297  India
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Location: Bangalore
Quote:
Originally Posted by miro1360 View Post
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

Last edited by har297; 26th November 2020 at 03:56 PM.
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Old 26th November 2020, 03:56 PM   #1143
miro1360 is offline miro1360  Europe
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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
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Old 26th November 2020, 04:01 PM   #1144
diyiggy is offline diyiggy
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Quote:
Originally Posted by manniraj View Post
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 .
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Old 26th November 2020, 04:01 PM   #1145
har297 is offline har297  India
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@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
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Old 26th November 2020, 04:11 PM   #1146
diyiggy is offline diyiggy
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Quote:
Originally Posted by miro1360 View Post
@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)
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Old 26th November 2020, 04:18 PM   #1147
miro1360 is offline miro1360  Europe
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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)

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
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Old 26th November 2020, 04:21 PM   #1148
diyiggy is offline diyiggy
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RPi source ?


Maybe it's the ad1862 of our friend that have suffered of outrage ?
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Old 26th November 2020, 04:29 PM   #1149
miro1360 is offline miro1360  Europe
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Quote:
Originally Posted by har297 View Post
@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
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Old 26th November 2020, 04:30 PM   #1150
miro1360 is offline miro1360  Europe
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@diyiggy
I have no RPi at home
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