No - it does not bypass it. It's just that the ASRC (via the DPLL) and the the input stream are now exactly in sync - meaning it is not really ASRC any more it is (no A for async any more) SRC Yes - in this case the DPLL BW is not very important - so you might as well leave it wide open. In the ES9018 you actually had to do this is some cases - because of the lock speed issue in the old DPLL. As far as I have seen the new DPLL does not have this flaw.
With the firmware you are using to switch between SPDIF and Serial(PCM/DSD) set SW1/P1 to off and wire an external switch (A0 and GND) via the EXT_IO header. Or you can use the DIP switch
Can you use a microcontroller to do the switching between SPDIF and Serial(PCM/DSD)? Just like the OttoII?
Alex
Can you use a microcontroller to do the switching between SPDIF and Serial(PCM/DSD)? Just like the OttoII?
Alex
Yes - and that's exactly what the on-board controller/firmware does. There is no external switching done at all. The DIP switch just lets the firware know which source you want it to select - you can use an external switch instead (via EXT_IO - keep the input select DIP switch open if you do that) or you can have your own controller do the same thing (just remeber to remove the on-board controller if you use your own external controller/firmware)
Yes - and that's exactly what the on-board controller/firmware does. There is no external switching done at all. The DIP switch just lets the firware know which source you want it to select - you can use an external switch instead (via EXT_IO - keep the input select DIP switch open if you do that) or you can have your own controller do the same thing (just remeber to remove the on-board controller if you use your own external controller/firmware)
I think I am getting confused here, sorry. My understanding is that on the EXT_IO, if I gnd pin 5 (A0), I get SPDIF as my source or DSD if not grounded. Am I correct? I dont get it when you said "No External Switching done at all"? I thought you do this switching to select your source? SPDIF or DSD? Clarification please..
Alex
My understanding is that on the EXT_IO, if I gnd pin 5 (A0), I get SPDIF as my source or PCM/DSD if not grounded.
With the current stereo on-board firmware you have - Indeed! It is important to leave DIP switch SW1/Pos1 open (off) if you do that via an external switch.
I mean that no signal goes through a switch
The only role of the switch is to tell the controller what to tell the DAC to select
Ok, I got it, so my question is, using the EXT_IO, instead of manually using a switch to ground A0, how do I do this using a controller? do I just connect A0 to the controller to switch high or low?
Alex
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Ok, I got it, so my question is, using the EXT_IO, instead of manually using a switch to ground A0, how do I do this using a controller? do I just connect A0 to the controller to switch high or low?
Alex
Yep - just make sure you you drive it high you do so at 3.3V - not more. The safest approach is an open drain to type output that will only pull low (letting the weak pull-ups keep the net high when not pulled low by your controller)
Yep - just make sure you you drive it high you do so at 3.3V - not more. The safest approach is an open drain to type output that will only pull low (letting the weak pull-ups keep the net high when not pulled low by your controller)
Ok, I got it, maybe, I will just use a simple relay to ground A0.
Thanks,
Alex
Ok, I got it, maybe, I will just use a simple relay to ground A0.
Thanks,
Alex
You should not need a relay - just make sure you are using a 3.3V controller
You should not need a relay - just make sure you are using a 3.3V controller
Yes, thank you, my problem though is that I already have a controller but its high is 5v not 3.3v, maybe a simple voltage divider? from 5v to 3.3v?
Alex
Or use a logic level converter like this one: Bi-Directional Logic Level Converter Hookup Guide - learn.sparkfun.com
Or use a logic level converter like this one: Bi-Directional Logic Level Converter Hookup Guide - learn.sparkfun.com
That would work, but should not be needed.
http://ww1.microchip.com/downloads/en/DeviceDoc/22103a.pdf
Whatever approach you take, make sure the external controller shares it's ground with the DAC.
Yes, thanks brian, russ
Also Mercury orders are open:
http://www.diyaudio.com/forums/twis...-achieving-escape-velocity-3.html#post5252094
http://www.diyaudio.com/forums/twis...-achieving-escape-velocity-3.html#post5252094
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