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DAC-END R (ES9018) full assembled board

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#1,245
Domi_78 said:
Hi Quanghao & Andrea,

I have been asking to you the schematic of the I/V output stage for several times and you did never answered me on that point.

So, following the traces on the PCB, I tried to recognize how are connected the output connectors XLR and RCA. I think it looks like the joined schematic and I consider this schematic is a little bit simplistic... This means that it is impossible to use at the same time the XLR connector to sub amp and RCA connector to main amp because we will encounter issues in impedance balance.

More, I notice that + and - are not "summed" on RCA output.

- Do you confirm my point of view ?

Thank you very much.
Click to expand...

I don't have the complete schematic at this time but as I told before you can use both outputs.
The XLR and RCA are in parallel so for the "impedance balance" the RCA load should be 10 times higher than XLR load.
The op-amp output impedance is very low so you will not ear differences also if there is a un-balanced impedance on XLR.
 
#1,246
Hi Andrea,
audiodesign said:
I don't have the complete schematic at this time but as I told before you can use both outputs.
The XLR and RCA are in parallel so for the "impedance balance" the RCA load should be 10 times higher than XLR load.
The op-amp output impedance is very low so you will not ear differences also if there is a un-balanced impedance on XLR.
Click to expand...

So, according to this schematic, if I need two unbalanced non parallel outputs, can I consider that :
- The output "+" remains connected to the RCA connector.
- The output "-" is connected through the XLR to a second RCA connector.

The consequence being that these two unbalanced RCA output are opposite in phase.
 
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#1,247
Hi,

To prevent loud pops in the loudspeakers, my DAC is now fitted with a mute on XLR and RCA outputs :
- A reused and modified protection circuit for loudspeakers controls one relay per channel that connects the outputs to ground during power up or during power down the DAC.
 

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#1,251
Hi Quanghao,
quanghao said:
it is not good for hi-end audio!
turn on and turn off the audio system should comply with the principle, you should not switch to a system for all.thanks
Click to expand...

I have been doing that way for more than thirty years and I have never never encountered any problem. I precise that, like most of professional and high-end equipements, all the components of my audio system are fitted with mute on turn on/off.
- This is the other easy way of using high-end audio for normal people 😉.
 
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#1,253
Quanghao,

I've sent my remaining payment (425$, shipping fedex). Pls confirm & check your PM for the details & address. Pls send the DAC after 12 August as I will be away until 18 August.

Do not forget to declare it as gift & lower value to avoid custom fee 🙂

Many thanks,
rachmanto
 
#1,255
quanghao said:
it is not good for hi-end audio!

turn on and turn off the audio system should comply with the principle, you should not switch to a system for all.

thanks
Click to expand...
Hello,
I agree with Domi-78 , general on/off is suitable when you have much audio devices.
Moreover , if you have valve amplifiers , a temporisation for High Voltage is used and all components have time for temperature stability.
Br
Jacky

Domi-78 : it seems we are the only french guys in this post , if you agree could we exchange our email address ?
 
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