DAC AD1862: Almost THT, I2S input, NOS, R-2R

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#8,327
That will be hella interesting šŸ™‚ Seems like a good chip to play with different stuff. Easiest one seems to slap precision opamp next to chip and call it a day, but i belive there are smarter solutions to be made šŸ˜ (not that i dislike servo opamps).
 
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#8,328
Methinks it works (at least on optical)

THANK YOU AAAAALLLLLL

Asymmetrical current draw is normal?
 

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#8,330
@lasercut Sorry for the bad pictures, but the dmm probes are stuck randomly, so the grey dmm shows the +-12V path, the orange dmm (right) shows the +-5V path.

To all, how shall I configure raspberry/Moode to play with USB? I mean what kind of DAC to put in it, 24/48 or 24/192, and what else?
Thank you!
 
#8,331
Hey Michelag, let me answer to yourself: USB input, JP3 = SPDIF= 1&2, JP4=1, JP5=1;
On Moode side,
Output, USB device, as DAC generic i2s dac, mpd options dsd over PCM, Sox resampling to 24/192.

And also this works šŸ˜

ReEdit: for DSD files, over PCM (also native works, if I could understand why), SoX resample 24/48, with 24/192 there's huge hiss
 
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#8,332
EUVL said:
Much has been said about the BJT IV from Sergio :
https://www.diyaudio.com/community/threads/dac-i-v-measurements.395738/
https://www.diyaudio.com/community/...-with-very-low-distortion.217459/post-5756616

Knowing Sergio's competence in audio circuit design, I also want to find out.
Although the power supply voltage is not listed in the original schematics, those skilled in the art can figure out that it should be +/-20~24V to have good performance.
Scaling down to +/12~15V rails plus 2.8k Riv, and the distortion figures look rather different in simulations.

But simulation is not reality, so there is only one way to find out.
The prototype works first time as expected, with 12V rails.
So direct plug-in to replace opamp IV (MUST remove Riv and Civ first).
DC drift from cold to steady state in less than 3 minutes is a not-too-small 60mV.
But once stable, it stays well within +/-5mV.
All transistors are matched in this case.

This will now go to Ireland for comparative measurements, as well as listening.
When all is fine, and there is serious interest, we shall publish Gerber.


Patrick

.
Click to expand...
Interested at this very good looking device
Is there any news from Ireland
 
#8,333
So Friends, approaching to the end of this project (yes enclosure still missing), and starting the next one (TDA1541... Or 1540? Or what?) I'm baffled.
This is called ssd1309, and has 7 pins. Not only I don't have a clue about Arduino programming, but here I don't know how to wire things here (except G and Vcc šŸ˜‰ )...
What I'd like to show is input (USB, coax, optical) and sample rate (and bitrate?)

To switch between USB/coax/toslink I think I will use a dpdt, nothing fancy. Although I populated Miro's input selector board, his USB/coax/optical board has just one i2s output, so no way using the input selector.
So, how to catch the i2s signal, communicating it to Arduino? And the inputs?

Sorry to monopolize the thread at this point, but this Arduino is Greek to me...

Thank you, mainly for the patience!
 

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#8,336
Michelag said:
So Friends, approaching to the end of this project (yes enclosure still missing), and starting the next one (TDA1541... Or 1540? Or what?) I'm baffled.
This is called ssd1309, and has 7 pins. Not only I don't have a clue about Arduino programming, but here I don't know how to wire things here (except G and Vcc šŸ˜‰ )...
What I'd like to show is input (USB, coax, optical) and sample rate (and bitrate?)

To switch between USB/coax/toslink I think I will use a dpdt, nothing fancy. Although I populated Miro's input selector board, his USB/coax/optical board has just one i2s output, so no way using the input selector.
So, how to catch the i2s signal, communicating it to Arduino? And the inputs?

Sorry to monopolize the thread at this point, but this Arduino is Greek to me...

Thank you, mainly for the patience!
Click to expand...
Few pages back I did post a project along the same lines, you can give it a try.

Post #8,276

For expanding the input option you can give the CPLD project a try.
 
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#8,338
What you have is an SPI based OLED, headover to chatgpt (if you have access to version 4 then it will be better) paste my code there and ask it to modify the code from ssd1306 I2C to SSD1309 SPI version, hopefully it will be able to modify the code.

Recently I have found chatgpt to be pretty good in helping with c, c++, python codes for various micros. Give it a try.
 
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#8,339
Ok rehana, I'm giving it a try.
My question is, where to I have to solder the pins for SPI (MOSI, CLK, CS, DC, RESET) ?

Given that Chatgpt says
#define OLED_MOSI 11 // Pin SPI MOSI
#define OLED_CLK 13 // Pin SPI SCK
#define OLED_DC 9 // Pin DC
#define OLED_CS 10 // Pin CS
#define OLED_RESET 8 // Pin Reset

// display object
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &SPI, OLED_DC, OLED_RESET, OLED_CS);

const int lrclkPin = 2; // Pin LRCLK
const int usbPin = 8; // Pin input USB
const int coaxialPin = 9; // Pin input COAXIAL
const int bluetoothPin = 10; // Pin input BLUETOOTH

so, bluetooth is 10 (as CS?) coax is 9 (as DC?), etc.

edit:

WOW! I corrected him, and gave out


#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_MOSI 11 // Pin SPI MOSI
#define OLED_CLK 13 // Pin SPI SCK
#define OLED_DC 9 // Pin DC
#define OLED_CS 4 // Pin CS
#define OLED_RESET 8 // Pin Reset

// Crea un oggetto display
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &SPI, OLED_DC, OLED_RESET, OLED_CS);

const int lrclkPin = 2; // Pin LRCLK
const int usbPin = 10; // Pin input USB
const int coaxialPin = 6; // Pin input COAXIAL
const int bluetoothPin = 7; // Pin input BLUETOOTH
 
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