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

Jump to Latest
#9,902
passive420 said:
Guys trust me - AD1862N- J

Some people have complained about price, it is what it is. Anyone cannot get these to their country I will help you.

@Baobei they are good to go 😉 - I have reached my limit of 50 PMs in 24 hours! Cant respond to anyone for the rest of the day. I talk too much...
Click to expand...
https://www.aliexpress.com/item/1005006059286892.html

I asked this guy to send me a sample of one pair to see if it's a scam. And he has had that ad since this summer, he hasn't sold anything. There are still 999 pieces. But he won't send AD1862, just sent me some stupid answers. He's just so frustrated with my proposal. And I explained nicely to him, if he sends it to me and I determine that they are valid, he will sell everything. He doesn't seem to believe me, big mistake. 🤣 🤣 🤣
 
  • Like
Reactions: passive420
#9,903
@NIXIE62 - He thinks you are the scammer 😆 Just buy 1 or 2 pcs, if you are not happy AliX will issue refund and local shipping company to return to with shipping label. I tried some PCM1704 chips a while back and didn't like the look of them, AliX were very good in getting refund and return process.

I also asked this vendor for samples, offered to pay for them of course but did not hear back. Got some quotes from WinSource and a couple other vendors on Digipart, might risk a small batch at some point.

We'll keep trying 😉
 
#9,904
I don't know what he's thinking, but he won't sell anything like this. I said I will pay him if they are good. It's simply too much of a scam, no one believes it without a trial. And I can't buy now, because yesterday I received a pair from the USA, that's enough for me to have as a reserve. I will try them one of these days, they seem very original.
 

Attachments

  • AD1862 USA.jpg
    AD1862 USA.jpg
    224.5 KB · Views: 94
  • Like
Reactions: krca45 and passive420
#9,906
Great to hear Nixie, who needs smelly old Rochester. Those Sparkos must sound good.

Finally received my Amanero clone today so have ben making op-amp boards up and Dupont style pluggable headers for running the op-amps at 15V. I previously broke two different I2S modules by constantly swapping boards and too much handling I guess - so I have armour plated this new one with Kapton tape over the IC's and a pair of heatsinks that I can hold better. I like it 😉

If you look at second pic you'll see some AD1862N-J I got from a different UK seller a while back, different printing but they look good, the print is quite faint and crisp, the camera enhances the effect. I'll try these first hopefully tonight. Got to sort my supplies out for 5V / 12V / 15V.

IMG_1110.JPG IMG_1111.JPG
 
  • Like
Reactions: miro1360, sworder84 and NIXIE62
#9,907
passive420 said:
Those Sparkos must sound good.
Click to expand...
Yes, to my surprise, it turned out to be an excellent match with AD1862. I was expecting too much sharpness in the sound, but it didn't turn out that way. Even the bass is better than with the V6 Classic. Still to try are the V7 Classic and the U30 USB/I2S. And I can close the box for a long time. I used a lot of Sanyo OSCON capacitors 150uF 25V on this PCB and I can say that it worked out great. The smaller ones are Panasonic FC. I'm really happy with how it sounds all together. Clean and rich.
 
Last edited:
  • Like
Reactions: passive420
#9,911
Sorenm said:
but did you try/like the PCM1704s?
Click to expand...

Yes, It is a good one. Made the mistake of buying one of Zoom's he had for sale. Shouldn't have done that.

Now I really want to try the 1704 with a proper good IV stage like the tube or DDNF and Zen IV for a few interesting experiments. Had Miro make gerbers for PCM1704 with JLSounds on board / no IV.
Gerbers below if you find any chips 😉

My collection as it stands, with my two 'Alpha' build DAC boards for final trials, will add the 1704 board to this soon. Might get a lid on this before the next ice age...

IMG_1112.JPG
 

Attachments

  • Like
  • Thank You
Reactions: mileny, miro1360, zoom777 and 1 other person
#9,917
@Michelag
zoom777

Post in thread 'DAC AD1862: Almost THT, I2S input, NOS, R-2R'

In a nutshell - take in i2S signal (3 selectable inputs) and output PCM (with inverted PCM too for balanced DAC) so that one can feed to dac direct without the glue logic, reclock for low jitter etc.
I see a lot of flexibilities on this board, as what Miro mentioned in his notes.
  • Like
M

Post in thread 'DAC AD1862: Almost THT, I2S input, NOS, R-2R'

CPLD for very low jitter with I2S inputs selector and selectable PCM output with Stop-Clock and ReClock function in progress 😎
Schematic based approach for CPLD. It will take some time to complete and test.
The schematic quartus project with modified pins will also be possible to upload into that standard 10€ CPLD board from aliexpress, there are inputs for oscillators 🙂
  • Like
 
#9,918
miro1360 said:
I/V based on TPA6120
edited post #9463 (added R3, R4 on the output signal, hole in the GND under the feedback trace)

Power supply range is from +-5V up to +-15V. It can be powered directly from DAC PSU.
R1 and R2 value determines the output voltage. For a higher output voltage use higher value of this resistor (1k5 == 1.5Vp, 2k7 == 2.7Vp, ...).
R3 and R4 resistors melf 0204 or SMD1206, value 22R up to 100R.
Capacitors are polypropylene and a high quality electrolytics (UKW from Nichicon is still available).
There is hole in thermal pad under the IC, where you solder the IC with PCB from the bottom.
IL, IR is current input from DAC.
VL, VR is voltage output.

Note, that a small (not harmful) DC offset may be present in the voltage output.

This is redesigned PCB and so far not tested.
BOM example: https://mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=5ca5f6fb0b
Click to expand...
Tested & working
 
  • Like
Reactions: weissi
#9,919
zoom777 said:
M

Post in thread 'DAC AD1862: Almost THT, I2S input, NOS, R-2R'

CPLD for very low jitter with I2S inputs selector and selectable PCM output with Stop-Clock and ReClock function in progress 😎
Schematic based approach for CPLD. It will take some time to complete and test.
The schematic quartus project with modified pins will also be possible to upload into that standard 10€ CPLD board from aliexpress, there are inputs for oscillators 🙂
  • Like
Click to expand...
@miro1360 do you think there is some "juice" left in the CPLD?, if I remember right I did try to work out the code for HD44780 based LCD and one I2c based SSD1309.

Let me search my HDD if it is still there.
 
Last edited:
You must log in or register to reply here.
Top Bottom