mahirzukic2
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- Joined
- Dec 25, 2018
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These questions are not noobish and are hardly ignorant, in fact they are quite good questions. I will let someone who has read the schematics more than me answer this question.
My KTB has been on order and in the mail for a month and its still nowhere in sight .... Usually I get my stuff delivered within 2~3 weeks max (using free shipping) from Aliexpress.
The official Khadas store hasn't been helpful either. Getting really annoyed.
There is no OPA1612 on the board. The output stage consists of 100% NDA (no datasheet or specifications available) opamps that are produced by ESS and sold as part of a complete ES9038Q2M DAC design. In essence this is implemented on the Khadas board with really great PCB design to complement the ESS design.
The parts are as the schematic calls them RT6862D and RT6863.
Seen here:
Yellow box is the ES9038Q2M DAC chip itself. Red cube is the output stage opamps.
Yeah, but I would like to craft something like that myself. Mostly because I want to learn something totally new and put RPI into use already.
Out of curiocity I have a few more questions that will allow me to understand a bit of how does the op-amps and circuits on DACs work. Please don't get angry, I do understand that they may be outrageously ignorant:
I've read somewhere that the board is equipped with OPA1612. Where are they located?
Since they're most like soldered to the board, would it be okay to unsolder them and swap with some other op-amps? Would it break the board or impair its awesome performance?
Would be there any point in changing them if the board itself is almost perfect?
Would it be possible to add an op-amp socket that would make op-amps swapping more convenient or it would only increase noise in signal or increase the resistance of a circuit that would negatively impact the sound?
Tracking hasn't moved in 3 weeks. Transport even by ship doesn't take 3 weeks to get to me, I have actually purchased some stuff on Taobao.com that were big enough to use ship cargo via a different forwarder and it was delivered to me in 3 weeks flat!
No I'm not in the US.
Usually I get my stuff from Aliexpress within 2~3 weeks maximum. On good runs, I have received items using "Standard Shipping" in 6 days!
This is tethering on the edge of lost shipments in my experience.
I have ordered the Khadas Tone Board on 17th of December, almost 2 months now. Still nowhere in sight. I am considering (most likely) filing a claim on paypal if it doesn't arive on the 2 month mark (17th of February).My KTB has been on order and in the mail for a month and its still nowhere in sight .... Usually I get my stuff delivered within 2~3 weeks max (using free shipping) from Aliexpress.
The official Khadas store hasn't been helpful either. Getting really annoyed.
When I compared to the SACD from disc, I didn't hear any different.
I'm using this driver with a different XMOS-based DAC and you're right about Windows settings, in Control Panel > Sound there's a max of 24/192 setting available. With the default Win10 drivers I guess more bitrate is available.
Source files: http://www.msbtechnology.com/faq/bit-perfect-test-files/, http://www.2l.no/hires/ etc.
Yep, should be same data
The bad part is can't play some 5.1 SACD lol which still need to play from SACD player
Without reading back through the last 20 pages here, what is the advantage to upgrading the firmware of the Tone Board? I can't find update notes on their website. My tone board is on stock firmware right now.