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

Hi,

i just got some 1862/65 boards printed. However, I see that the Jp-1 and Jp-2 are already shorted.

Is this a QC issue from the factory; do I cut the traces before stuffing them? What options do they entail with/out the short

also, what are the x-1,2,3 socket mounted connectors called?

thanks in advanced
Break JP1 and JP2 only if you are using direct drive, without the shift registers. Otherwise leave them as they are. x1, 2 and 3 are UFL connectors. you do not need these if you are using the direct i2s pads.
 
The reference for DAC with glue logic still be this (without R1):

I2SoverUSB BCLK (H3:11) —> BCK Dac
I2SoverUSB DATA (H3:13) —> DATA Dac
I2SoverUSB LR (H3:15) ——> LRCK Dac
GND (H3:14...) ——> GND

But now in manual is section with different I2S protocols, do the following configuration from the page 5:
"JLsounds AK4396 DAC board I2S mode (old I2SoverUSB board)"
J3:Open, J4:Open, B1:Close, B2:Close, B3:Close, B5:Open
... this should be the standard I2S mode in 64-bit frame
Does this also apply to PCM63 ? I have a hissing sound like a radio station - only with B3 😬
 
@mikorist Exactly, close jumpers B1, B2 and B3 :)
Closed B1 B2 and B3. Still static noise. When play is pressed. When I change the frequencies, the noise also changes.
Noise is full stereo... Changed the USB cable, restarted the computer.. Checked I2S again 2, 4, 6 is H3:11 H3:13 H3:15
Screen Shot 2022-07-24 at 08.26.02.png

GND is shared because i have onother PSU 2 a separate one only for the digital part.

I have no idea what to look at next... I don't have an oscilloscope .... 😬
 
Closed B1 B2 and B3. Still static noise. When play is pressed. When I change the frequencies, the noise also changes.
Noise is full stereo... Changed the USB cable, restarted the computer.. Checked I2S again 2, 4, 6 is H3:11 H3:13 H3:15
View attachment 1074789
GND is shared because i have onother PSU 2 a separate one only for the digital part.

I have no idea what to look at next... I don't have an oscilloscope .... 😬
I mixed I2S - It is plaing now :ROFLMAO:
 
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mikorist,

Nice work getting your rig working.

Are those Sparkos opamps you are using? Have you compared them to other opamps? If so what are your impressions?
Yep....
SS3601 - I asked from
Andrew to match me two pieces with an even tighter resistor tolerance...The separation and stereo effect that comes out of all this together is - eesoteric. I think it's the best opamp for the money. But it's still a matter of taste that you decide on.
AD797 is is very good too.
 
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The nice folks at Burson were kind enough to send me a pair of their V5I-S hybrid opamps to try out. They seem to be a combo of a regular opamp and some pixy dust in a smaller more easily substituted size. I gave them a good listed today. Before the test I had some Sparkos labs discrete opamps in the I/V spot. I substituted in the Bursons and listened to the same song list. The Bursons are very nice and clearly bested the AD797, LME49710, and LT1363 opamps that I had on hand to try, of those regular opamps I liked the AD797 best. The Bursons were clear and on the warm side, nice detail, good soundstage, and good balance across the spectrum. Seemed to have less glare on piano than with regular opamps. I certainly could live with them and they are a worthy lower cost upgrade. However next to the Sparkos labs fully discrete some magic was lost. Flatter less holographic sound stage, not as liquid, and not as detailed across the board. The Sparkos are back in.
 

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The DAC plays all possible musical genres like nothing. It works like a crisp Swiss watch. I don't know how PCM63P-K plays but this Y version is top-notch. No bugs - chopping or anything weird. This PCB is perfect. I have never heard such a vivid sound coming out of headphones.The smile does not leave my face. :love: :worship:

Glad to hear your impression 🤩
 
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