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Old 17th January 2018, 02:10 AM   #281
thuanth43 is offline thuanth43  Viet Nam
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If you ever redesign the DAC to have I2S/USB input, I would love to have a board set. Always fancy in old-time NOS DAC.

It would love neater if you make the PSU board bigger to fit those 3 Talema transformers onboard.
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Old 17th January 2018, 02:16 AM   #282
phongnavy is offline phongnavy  Viet Nam
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Quote:
Originally Posted by thuanth43 View Post
If you ever redesign the DAC to have I2S/USB input, I would love to have a board set. Always fancy in old-time NOS DAC.

It would love neater if you make the PSU board bigger to fit those 3 Talema transformers onboard.
Tks, maybe coming soon.
and I Always fancy in old-time NOS DAC, too
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Old 23rd April 2018, 02:40 AM   #283
synonymous is offline synonymous  United States
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Default wacDAC

Second go at my DIY DAC
Low temp solder paste is your friend!
Some extra PCBs if anyone is interested
PCM 5122 based

Cheers

wacDAC.png
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Old 23rd April 2018, 06:51 AM   #284
Malefoda is offline Malefoda  France
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Quote:
Originally Posted by synonymous View Post
Second go at my DIY DAC
Low temp solder paste is your friend!
Some extra PCBs if anyone is interested
PCM 5122 based

Cheers
Nice work!
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Old 15th June 2018, 05:07 AM   #285
synonymous is offline synonymous  United States
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Third go! lol

Once you use the low temp solder paste your'e on your way!
Experimenting with different board colors and edges

IMG_20180611_230033.jpg
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Old 1st July 2018, 08:17 AM   #286
3lite is offline 3lite  Poland
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Hey folks, I've decided to post photos of several D/A converters of mine here. I hope you will enjoy it

First of all, moving-average 32x AD1865 DAC with no digital filter whatsoever (linear interpolation in hardware thanks to moving-average idea):

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Another one is with one AD1864/AD1865 and an ASRC (AD1896) acting as digital filter upsampling to 210,9375 kHz. The analog filter is 10th order FDNR (frequency dependend negative resistor - Frequency dependent negative resistor - Wikipedia):

Click the image to open in full size.

Several spinoffs were made of this idea resulting in discrette I/V stage with an active correction of input impedance with AD1864/AD1865, PCM1704 and TDA1541A:

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THD of that D/A converter was well beyond three zeros after the dot:

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PCM1704:

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TDA1541A with low noise current source to create a bipolar output from it:

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Click the image to open in full size.

Last edited by Mooly; 2nd July 2018 at 12:15 PM. Reason: Image removed as requested
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Old 1st July 2018, 08:55 AM   #287
batteryman is offline batteryman  United Kingdom
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Originally Posted by 3lite View Post
Hey folks, I've decided to post photos of several D/A converters of mine here. I hope you will enjoy it
But you have not said what they sound like!

Which do you prefer and why, compared to the others?
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Old 1st July 2018, 09:14 AM   #288
3lite is offline 3lite  Poland
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All of them do sound different and it is hard to pick one up since it all depends on your whole system, but if I had to choose one for mine I would go for moving-average with 32x AD1865. In fact, that is the one playing right now, however, the one with 1x AD1865 is quite good as well.

In general I do appreciate the sound from all of them, however, there is one which I didn't like much and that was PCM1704. I don't know what is about that chip, but I just don't like the way it sounds - it's not bad, but definitely worse than the others.
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Old 1st July 2018, 08:52 PM   #289
synonymous is offline synonymous  United States
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Serious work there
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Old 2nd July 2018, 03:56 AM   #290
abraxalito is offline abraxalito  United Kingdom
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Lots of hours spent in PCB layout there, kudos.

I see you have some fairly complex active filters after your DAC, based on opamps. Have you tried LC (passive) filters? I ask because I tried a complex opamp-based elliptic filter after my DAC and didn't like the sound much. These days I only use passive filters - attached prototype 9th order LC filter I/V stage.
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File Type: jpg 4LCIVstage.jpg (149.7 KB, 145 views)
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