HeyManslowdown97
500+ Head-Fier
I REALLY struggle with this...
What do you mean when you say "conversions directly to AK449xx chip"?
Oscillators provide clock reference, replacing them with more stable versions (like I and some other members here and on russian counterpart forum, which is absolutely safe to use by the way, done) improves jitter, which has positive effect on HF quality (softening highs up) and soundstage. Replacement parts are readily available from arrow and their codes are easy to find using search function in this thread, so the hard work of finding suitable and compatible yet inexpensive components and confirming that they work has been collectively done.
TPS73250 does not do ANY processing whatsoever, it provides AK4497 with 5V power source, used to power analog output section of AK4497 and serve as a VREF. Compared to (genuine, but lower quality, not "fake") stock LDO it has reduced noise, providing yet another incremental quality upgrade.
The effects of oscillator and LDO replacement are similar (as described above), but reason for improvement is different: less jitter induced distortion (which is not harmonic distortion by the way and thus is much more noticeable); less noise in 5V power supply decreases noise floor and its masking effects (very noticeable on long reverb tails for example), and (most importantly) stable VREF is crucially important in DA conversion, as fluctuating/noisy VREF voltage introduces noise/distortion. Another way to improve VREF stability is to add capacitance, which has been done by few members, including myself. Please also refer to the extract from AK4490 evaluation board manual (older revisions, it's been redacted from current version):
I believe the best way is just replace both oscillators and LDOs and add VREF capacitance and have a good listen, this will leave very little room for speculations as to what effect replacements/upgrades may have and which component has more significant effect on sound quality, again this has been done by a few members already, who posted their impressions in this thread.
As to the basic electrical practices, how are they related to Moore's law? Moore's law is related to transistor count increase in CPUs, while LDO's have had only few transistors for for last 30 years since they were introduced....
“convolution” not conversion. It was a typo.
“to the basic electrical practices, how are they related to Moore's law? Moore's law is related to transistor count increase in CPUs, while LDO's have had only few transistors for for last 30 years since they were introduced....”
No comment.
“Computer chips, both for CPU and memory, are composed of semiconductor materials. Semiconductors make it possible to miniaturize electronic components, such as transistors. Not only does miniaturization mean that the components take up less space, it also means that they are faster and require less energy.”
LDOs power the CPUs as well. It’s a computer chip. The ministurization is Moore’s Law. The CPU is also POWERED by the LDOs as well on the Zishan Motherboard! Basic electrical knowledge probably would explain noise from the ground if they are not performing up to par on the Motherboard and CPU/Oscillator performance so it would effect YOUR sound on the DAC or if you Spinal tap your DAC with the Op1622 mod then wonder why you are getting noise with you connect the DAC to the LED, it’s controllers and the CPU. So you are saying the Stock ones are just as good?? Then why did you change them and keeping saying they “rock” because something isn’t adding up? What “rocks”? The Matrix Quote??
Please explain what you mean then but it “rocks”?
I scratch my head why someone would put a Opa1622 which is designed for headphone Amps without crossfeed circuitry in the Zishan damaged the board trying to get rid of ground noise then asking for charity to solve this problem for it?
I’m struggling to understand.
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