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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 21st November 2020, 06:19 PM   #1111
diyiggy is offline diyiggy
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Join Date: Jan 2019
JosephK, your ak4499 dac is good cause the decoupling layout with acrylics and the 1656 ! (I'm almost sure about that, say 80% I bet !)



Swap it with a ak4493 or 97 and I'm sure one can not hear the difference as the noise floor is so low ad the technology close enough with the dac chip ! (well I haven't purchase the dac from the japoneese guy as I'm a little short on monney for my hobby these days).


The 1656 is a good take
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Old 21st November 2020, 06:25 PM   #1112
Joseph K is offline Joseph K  Hungary
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Join Date: Dec 2004
Location: gran sasso
I have a very good dac with 4490, the Mirand V1. 1, heavily modified. It is very much up to the task, indeed.
It has Sonny's discrete opamps as diff/se summing in output.
It does sound different (ly good..) and given that both my dacs with AK4499 are having a similar signature, I think much of it 'moves' with the dac chip..

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Old 21st November 2020, 06:35 PM   #1113
diyiggy is offline diyiggy
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Have you populated your Miro ad1862 board yet ? You have a good collection of DACs to make benchmark with references for the mods !
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Old 21st November 2020, 06:36 PM   #1114
Robin De Wolf is offline Robin De Wolf  Netherlands
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Quote:
Originally Posted by juancho View Post
Hi Robin,

I have a souped up four board DDDAC with valve output stage which is very, very good. I'd expect to beat that with this design, passive i/v and valve output stage and that's what I'm building. I think you'll find as you are, that the op amp is one of the keym limiters in this implementation. I'll report back when I've got my chips and completed the build.

David
Please do! Looking forward to hearing your experiences.

What makes you think that this setup will beat the dddac?
For the "Miro" (if I may baptise mineDAC AD1862: Almost THT, I2S input, NOS, R-2R) I have some passive I/V resistors (100r and 200r). What I could try is to add wayne linestage after this as a gain stage?

Today's listening session was very good, no fatigue whatsoever.
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Old 21st November 2020, 06:57 PM   #1115
Joseph K is offline Joseph K  Hungary
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I have had a disgrace with my try at it..
Unfortunate. Postal problems.

Would enjoy very much, partecipating. Will see how it comes out
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Old 22nd November 2020, 10:25 AM   #1116
juancho is offline juancho  United Kingdom
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Quote:
Originally Posted by Robin De Wolf View Post
Please do! Looking forward to hearing your experiences.

What makes you think that this setup will beat the dddac?
For the "Miro" (if I may baptise mineDAC AD1862: Almost THT, I2S input, NOS, R-2R) I have some passive I/V resistors (100r and 200r). What I could try is to add wayne linestage after this as a gain stage?

Today's listening session was very good, no fatigue whatsoever.
I built a DAC with AD1865 with tube output stage which was 'better' than the DDAC using a DIYHK board which I don't believe is as good as this one, and I reckon the AD1862 is 'better' than the 1865. One issue with the DDDAC is its quantisation noise, which means you have less apparent dynamic range
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Old 22nd November 2020, 01:07 PM   #1117
miro1360 is offline miro1360  Europe
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@juancho
AD1862 sounds better (less muddy) than AD1865 on the same setup (I/V, PSU, data)
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Old 22nd November 2020, 02:09 PM   #1118
Vunce is offline Vunce  United States
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Join Date: Jan 2014
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DAC AD1862: Almost THT, I2S input, NOS, R-2R
I agree with your opinion Miro.
I have AD1865 Dacs by Raindrop_hui and DacEnd24, I prefer this AD1862 Dac board over both of them.
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Old 24th November 2020, 09:17 PM   #1119
Robin De Wolf is offline Robin De Wolf  Netherlands
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Join Date: Jan 2019
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Still enjoying the DAC in the evenings! Got me wondering, how should I best deal with high res files from qobuz via my rpi with moode installed. I set mood to generic i2s dac with no resampling. 24/96khz files play but 24/pp192khz heavily distort. Should I set the moode client to always resample to 16bit?
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Old 25th November 2020, 12:43 AM   #1120
miro1360 is offline miro1360  Europe
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@Robin De Wolf
24b/192kHz audio should work with this DAC (from that 20 most significant bits will be played). You can test it with an xmos based USB-I2S.

... the DAC logic does support a 64-bit frame I2S ... it does not support shorter bit frames (48 (2x24), 32 (2x16)) ... this 64-bit frame will transfer all stereo music files in resolutions 16-bit, 24-bit and 32-bit (from that 20-bit will be played)
... the question is: Does the RPI support 64-bit frame on 192kHz? RPi 4 should support it, but the older ones may be limited.
... I googled, that RPi 3 does support 24b/192kHz as the maximum, and here I don't know if it sends these bits in a 48-bit frame or can handle the 64-bit frame. If 16b/192kHz is played on the DAC, they are sent in the 64-bit frame, the same for 24/96khz (because it worked), but what is the frame for 24b/192kHz? (I found, that HDMI works only in 16b/192kHz) ...

Try to shorten the I2S wires. Or use a shielded wire for the I2S (but it probably won't be the solution )

DAC AD1862: Almost THT, I2S input, NOS, R-2R-shielded-i2s-wire-jpg
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Last edited by miro1360; 25th November 2020 at 12:49 AM.
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