Yes I will consider it.
By the way the sound of my Dac/Pre is stunning. I do not think I have ever heard anything even near it.
Can the OPUS be controlled via a PIC microcontroller? Has anyone written a set of code to do that? I am very much interested in that idea. I am no good in programming, but I use PICBASIC PRO for some simple things. It had crossed my mind whether the use of a PIC to access the OPUS software functionality could be achieved.
Configuring IVY II boards
Hi,
As i am new to DIY i have spent hours trying to find information how to set up my dualmono opus / IVY correctly. The problems i have is regarding the IVY II boards.
I have 2 Opus Ver 2 boards each feeding an IVY II in Dualmono. The amplifier is based around the Hypex Ucd400HG HxR module.
The easy part, replace R13 - R16 2K resistors on IVY to 1K.
The hard part.
The Hypex modules has an input impedance of 100K and an input cap to prevent DC. So, do i need to change the output impedance on the IVY and what changes is needed to make the IVY II DC coupled?
Russ mentioned that he preferred using the IVY without the analog filtering on the IVY leaving it to Opus. In this case, which components do i leave out?
Anything else that i dont know of to improve the IVY board in my configuration.
Any answer, tips and trix will be greatly appreciated.
Thanks,
Hi,
As i am new to DIY i have spent hours trying to find information how to set up my dualmono opus / IVY correctly. The problems i have is regarding the IVY II boards.
I have 2 Opus Ver 2 boards each feeding an IVY II in Dualmono. The amplifier is based around the Hypex Ucd400HG HxR module.
The easy part, replace R13 - R16 2K resistors on IVY to 1K.
The hard part.
The Hypex modules has an input impedance of 100K and an input cap to prevent DC. So, do i need to change the output impedance on the IVY and what changes is needed to make the IVY II DC coupled?
Russ mentioned that he preferred using the IVY without the analog filtering on the IVY leaving it to Opus. In this case, which components do i leave out?
Anything else that i dont know of to improve the IVY board in my configuration.
Any answer, tips and trix will be greatly appreciated.
Thanks,
R13-R16 are for the balanced to single-ended converter, so it won't affect your set up since you are feeding balanced to the Hypex.
Leaving out C1-C4 removes the low pass filter
In theory IVY will remove the DC offset, so the input cap in Hypex is not needed. (But I would leave it there). I feed my Hypex Amp (180hg) straight from OPUS. So the capacitor blocks the DC offset coming out of OPUS.
The wolfson data sheet recommends a low pass filter at the output of the DAC, so I added an RC circuit to the input of the hypex amp with cut-off of 70KHz (can't tell if it makes a difference), but I asked Hypex, and they said the amp does not have an input filter. The C1-C4 in IVY does the same thing.
Next you should get an Arduino and program the internal registers of the DAC 🙂
Leaving out C1-C4 removes the low pass filter
In theory IVY will remove the DC offset, so the input cap in Hypex is not needed. (But I would leave it there). I feed my Hypex Amp (180hg) straight from OPUS. So the capacitor blocks the DC offset coming out of OPUS.
The wolfson data sheet recommends a low pass filter at the output of the DAC, so I added an RC circuit to the input of the hypex amp with cut-off of 70KHz (can't tell if it makes a difference), but I asked Hypex, and they said the amp does not have an input filter. The C1-C4 in IVY does the same thing.
Next you should get an Arduino and program the internal registers of the DAC 🙂
I have a maxxed out OPUS. All digi inputs feeding into mux into a metronome into a opus and finally to IVY. Also have a volumite to control volume digitally but can not get it to work. have tried every method of software control and get absolutely no sound when hooked in line. any help please?
What do you mean by "every method of software control ". How is the Metro set up? If the Metronome is set to output 192K, then you cannot apply oversampling in the wm 8742 DAC (the OSR bits has to be 10)
Metro is set up to oversample to 192K. Does that mean I can't oversample and have a volumite. What If have music sources with different sampling rates (44.1, 48, 96)?
You can have everything, but the software in Volumite has to be able to configure the DAC properly. I wrote my own code for the WM8741. I don't know how the volumite is configured, but if you are using the WM8741 (the latest OPUS):
OSR bit has to match the incoming sample rate: For 44.1 you can choose: high internal upsampling, medium and no upsampling. For 192K incoming sample rate: you can only choose no internal upsampling.
If the volumite is set to apply high or medium upsampling (it assumes that incoming sample rate is 44.1) then you will get no sound.
You can try setting Metro to 48K sampling rate and see if it works (but 48K doesn't seem to be an optimal use of Metro)
Otherwise, you can copy the code from my website and build your own software controller.
OSR bit has to match the incoming sample rate: For 44.1 you can choose: high internal upsampling, medium and no upsampling. For 192K incoming sample rate: you can only choose no internal upsampling.
If the volumite is set to apply high or medium upsampling (it assumes that incoming sample rate is 44.1) then you will get no sound.
You can try setting Metro to 48K sampling rate and see if it works (but 48K doesn't seem to be an optimal use of Metro)
Otherwise, you can copy the code from my website and build your own software controller.
Can you describe how you have the Volumite hooked up? You get no sound even without the Volumite? It would be helpful to post a picture of your setup.
I get music without the voumite hooked up and all opus settings at hardware control. I hooj up volumite just as have been told to:
SCL - DSD
SDA - MD
For software on OPUS have set:
DSD 0
DEEMPH 0
MODE 0
IWO 0
OSR 0
ANd get no music.
SCL - DSD
SDA - MD
For software on OPUS have set:
DSD 0
DEEMPH 0
MODE 0
IWO 0
OSR 0
ANd get no music.
Is there a way with the Volumite controller and the Opus WM8741 to be able to also control the output polarity and filter mode selections? I understand the volume control part. Are these a firmware only change?
Thanks for the help.
Thanks for the help.
The volumite already supports changing filter modes. you just pull the appropriate inputs down to select the mode.
As for output polarity, just wire the outputs in the desired phase. 🙂
As for output polarity, just wire the outputs in the desired phase. 🙂
Thanks for the replies.
Wanted to be able to switch polarity on the fly instead of using a fixed output. Have many older recordings that do benefit from the change.
Also wanted to remotely switch the filters.
Will be trying the Ardunio USB based uC with I2C bus and give the programming a try. Want to implement the VC with the full 0.125dB steps to be able to use as a balance control as well as volume.
Wanted to be able to switch polarity on the fly instead of using a fixed output. Have many older recordings that do benefit from the change.
Also wanted to remotely switch the filters.
Will be trying the Ardunio USB based uC with I2C bus and give the programming a try. Want to implement the VC with the full 0.125dB steps to be able to use as a balance control as well as volume.
I have a couple questions about using the DSD inputs on the WM8741. First, is it possible to utilize the Metronome in this configuration? Second, what's the best way to switch between DSD and PCM? Wire them both up, and then switch via software? I'm assuming the device will have to be power cycled for the change to take effect if the hardware switches are used?
best to have a mechanical switch between dsd and pcm and then make selection in software. If you are using s/w, have it control the mechanical switch