Pouyoux
Member
HDMI ARC works just fine with my Hisense PL1 projector but CEC volume does not, so I'll send back the DAC waiting for a SMSL DAC with HDMI ARC and CEC
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SMSL DO100 PRO - HDMI ARC DAC
- Thread starter V.b.
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@ICIETDIYEUR thanks for very detail and kind answers.Hello.
No, they are not physically independent.
Here is a picture of the PCB to better understand ->
View attachment 436732
In '1' (green) these are the DAC chips ES9039Q2M, it has one per channel (right and left).
These DAC chips will deliver a CURRENT (I) output which will be converted into VOLTAGE (V) by the OPAMPS in '2' (orange) but also a low pass filtering.
In the case of the output signals on XLR sockets, these signals from the OPAMPS in '2' (orange) concerned by one of the channels (i.e. 2 OPAMPS per channel) will form what is called the 'hot spot' and the 'cold point' necessary for a balanced signal, the latter will first pass through a kind of 'digital relay' in '4' (yellow) before arriving at the socket concerned.
In the case of the output signals on the RCA jacks, the signals from the '2' (orange) OPAMPS that have formed what is called the 'hot spot' and the 'cold spot' for each channel will pass through the '3' OPAMP which will perform what is called a 'differential summation' in order to create a unique signal for each of the RCA channels (right and left).
Then this signal will in turn pass through a 'digital relay' in '4' (the middle one in yellow) to finally arrive at the RCA sockets.
So when you select on your DAC in the 'RCA + XLR' menu, all the 'digital relays' pass the signal and the outputs of the OPAMPS are somehow connected to each other, unless there are capacitors linking to their outputs but we don't have the circuit diagram....
... what is certain is that the more devices you connect to the different outputs of the DAC (RCA and XLR) the more you will expose yourself to possible 'ground loop' problems
That said: above each 'digital relay' we see 'MELF' resistors in series with the signal that serve to protect the OPMPS upstream.
Moreover it seems that since each OPAMP output also provides a 'low-pass filter' function then a capacitor is in series with the signal, but without the diagram we are not sure of anything once again.
I inquired SMSL directly. Below is the answer;
Yes, it's ok to use XLR and RCA output to different device at the same time, they are isolated, you can choose the one you like most.
I plan to connect Rolls DB24; it can sum stereo unbalanced and output mono balanced.
Yes, use the rotary encoder or the remote to change volume.
The DO100Pro is a DAC so you just need to connect it to the amplifier.
somebodyelse
Master Contributor
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If you check the TI product page or datasheet for the OPA1612 you will see the packages it is available in. It looks like SMSL have included a footprint for both the larger SOIC-8 and smaller SON-8 so they can use either depending on price and availability.
https://www.ti.com/product/OPA1612#pps
https://www.ti.com/document-viewer/OPA1612/datasheet#pin_configuration_and_functions/SBOS3777360
https://www.ti.com/product/OPA1612#pps
https://www.ti.com/document-viewer/OPA1612/datasheet#pin_configuration_and_functions/SBOS3777360
So ICs with OVII screening are opa1612? I got it from my friend dirt cheap around 10pcs for 10 bucks as he dislikes its sound. Using almost all of its in Fosi v3 Mono and ZP3
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ICIETDIYEUR
Addicted to Fun and Learning
Good morning.
This operational amplifier nevertheless has very good technical characteristics: how can this be possible?
Can an element that has very good characteristics have poor sound reproduction?...
That said, a very good musical instrument can have a poor sound reproduction if the person playing it does it incorrectly or if the listeners do not appreciate it or even both
This operational amplifier nevertheless has very good technical characteristics: how can this be possible?
Can an element that has very good characteristics have poor sound reproduction?...
That said, a very good musical instrument can have a poor sound reproduction if the person playing it does it incorrectly or if the listeners do not appreciate it or even both
somebodyelse
Master Contributor
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Maybe - unfortunately remarking cheap opamps and selling them as something more expensive is a problem in the grey supply chain. This happens even with opamps we would consider as cheap, like the 5532. If you or your friend got them dirt cheap there's a fair chance they're not what they claim to be. Good manufacturers take the 'trust but verify' approach because of this, testing random samples from each batch and testing to verify they perform as specified. They may also decap them and stick them under the microscope to check that the silicon is as it's meant to be. Most of us don't have these capabilities, so should stick to reliable sources. Usually that means a trusted supplier like Mouser, DigiKey, RS, Farnell etc. but sometimes manufacturers do direct sales or samples.
As for disliking the sound, unless there were the necessary controls in listening tests the most likely explanation is one or more of the many confounding elements we need the controls to counter.
olds1959special
Major Contributor
Keeping my DO100 Pro and selling my DL200, since it sounds better.
there is no reason for them to sound better or worse
olds1959special
Major Contributor
The D0100 Pro is a dual dac design, the dl200 is not, and it sounds a little more clear to my ears.
you just need to learn how to do proper ABX comparisons. DL200 is an excellent DAC. Dual DAC design is nothing more than marketing
formdissolve
Addicted to Fun and Learning
I don't think this is possible with this unit
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