I did a quick listening session like I did with resistor I/V
wouldn't it be nice to bypass the many resistors and opamps and capacitors in the signal?
Again it is only a mirror of illusions, such is NOS, passive I/V and first order/simple filters without opamps.
I know exactly how my dac sounds.
Bypassing the filter opamp, only using first order filter and relying on my amp filter here is some grand ensemble chorale + orchestra + organ how the sound appeared to me I took notes of what struck my ears :
Then I reinstalled the filter and here is my review:
%%% = it is obvious that there is something charming, and striking without the filter, but you miss a lot by using it and what you gain is not worth it. Same apply to NOS, resistor I/V.
wouldn't it be nice to bypass the many resistors and opamps and capacitors in the signal?
Again it is only a mirror of illusions, such is NOS, passive I/V and first order/simple filters without opamps.
I know exactly how my dac sounds.
Bypassing the filter opamp, only using first order filter and relying on my amp filter here is some grand ensemble chorale + orchestra + organ how the sound appeared to me I took notes of what struck my ears :
- much highs
- voices were somewhat caricaturized
- very explosive
- trumpets dominated the scene
- sounds clear
- somewhat textured sound
- Bass OK, but in retreat
- on second track I noticed a lot the bows hitting the cellos strings
Then I reinstalled the filter and here is my review:
- sounds balanced, flutes re-appeared playing in duet with the trumpets, they were eclipsed before
- I can hear the whole registers of voices (bass, baritone, alto, soprano, tenor)
- Good timing
- Complex
- Textures are incredible
- very equilibrated sound
- second track: I can hear each instrument, and the ambiance is there.
%%% = it is obvious that there is something charming, and striking without the filter, but you miss a lot by using it and what you gain is not worth it. Same apply to NOS, resistor I/V.
Do not get discouraged with the square method of adjusting 4 trim pots, it is the only way... It is very easy to see how to adjust the 3, 4 bits , then 2nd is harder to adjust, then MSB.
%%% the icing on the 'dac' is a nice big heatsink with thermal paste, this improves the sound, as the Dac runs cooler and has a big surface to dissipate the heat it is more stable and the head doesn't go so much into the PCM.
%%% the icing on the 'dac' is a nice big heatsink with thermal paste, this improves the sound, as the Dac runs cooler and has a big surface to dissipate the heat it is more stable and the head doesn't go so much into the PCM.
Second board, I was able to adjust the 4 bits better than on the pictures, don’t get discouraged.
A whole week of work there, new socket for filter, 16 hiQ np NX .47uf 50v , 4 extra bit trimpots , new input and output schematic, new power caps and new power schematic for dac ic, gold rca, classD regulator -12v , special pre-reg for digital , external 5v reg,
Start from empty board next time!!!!