I can not decipher schematics very well.
Personally I am skeptical to discrete op-amp's, since they usually have very high distortion compared to AD797, LME49990, LT1363, I think it's more realistic to use these chips biased to Class-A.
The AD1853 is interesting but the AD1866 is pure R-2R I think, I prefer to support the pure R-2R, thermometer, string DAC's, not the Sigma-Delta, they are just cheaper to produce that's all.
The schematic looks sort of mysterious and pretty, maybe it sounds nice, I have no idea.
Personally I am skeptical to discrete op-amp's, since they usually have very high distortion compared to AD797, LME49990, LT1363, I think it's more realistic to use these chips biased to Class-A.
The AD1853 is interesting but the AD1866 is pure R-2R I think, I prefer to support the pure R-2R, thermometer, string DAC's, not the Sigma-Delta, they are just cheaper to produce that's all.
The schematic looks sort of mysterious and pretty, maybe it sounds nice, I have no idea.
I wanted to made AD1862 but it not produced.
I can get PCM1702U-K, but the price is 110 USD...
p/s: Jean Hiraga's Le Monstre 8W and Jean Hiraga's Super Class A 20W.
It has been produced a long time ago. PCM1701 (as I know) was a little better.
p/s: too many "was"
PCM1704 not good, than PCM1702, AD1862 much better. PCM1704 - 24 bit, but realy 20 bit. From BB the best DACs: PCM58, PCM63, PCM64, PCM65 and PCM1701.
Very good DAC was Ultra Analog D20400.
Good and best delta-sigma:
AD1853, PCM1794, SM5865, CS4328, CDX2562, NM64735.
Yes, the price is very reasonable and it's a rather serious looking DAC, isn't it?
I'm thinking about it as my next project, with improved IC and capacitors et cetera.
Something I heard (CD-Players PCM63, PCM1701, PCM1702) something from internet.
If I'll make multibit, I would have done PCM1701, AD1862 or UA D20400. p/s: yesterday I finded Vangelis - Blade Runner OST SACD.
The Lingmei looks good value but its got the standard design traits (toroidals, power board separate from DAC, no mains filtering). It would take a lot of work to add better regs onto the DAC board itself. Running the LEDs to the front panel in the same loom as the raw mains can't help much with mains isolation.
If you want total isolation from public mains, maybe to make DAC's power supply on batteries.
And what do you think about class a discrete output, did you hear such DAC?
Yep batteries are probably the best way to get total isolation. But managing the isolation is normally enough. I plan to use not batteries but supercaps on my next DAC build - they look to have lower impedance (hence lower noise) than batteries.
No, never heard a PCM1704 with any kind of output stage. I think passive I/V then fairly steep passive filtering is the optimum, discrete OPS with no filtering would be worse sounding than this.
No, never heard a PCM1704 with any kind of output stage. I think passive I/V then fairly steep passive filtering is the optimum, discrete OPS with no filtering would be worse sounding than this.
I'll use CRC for output 20000 uF+4,7 om+40000 uF, and CLC for digital and analog parts of DAC 9400 uF+L+18800 uF. Resistors will be 0,25% 15 ppm.
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