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Old 10th February 2013, 08:19 AM   #161
mvaldes is offline mvaldes  Italy
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Quote:
Originally Posted by Corpius View Post
So basically you're writing all commands to the registers of both DAC's. That's more or less the same as setting it to dual mono, exept for the mono part of course how about the DAC polarity? Anti-phase or in-phase?
Correct, it's like controlling a dual mono.
The output should be in-phase (assuming I understood correctly your question )
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Old 10th February 2013, 08:29 AM   #162
Corpius is offline Corpius  Netherlands
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Quote:
Originally Posted by mvaldes View Post
Correct, it's like controlling a dual mono.
The output should be in-phase (assuming I understood correctly your question )
Any other changes to the code? This is very easy to implement. If this is all I'll start to add the multichannel option real soon. It will be accessible from the interface, so no additional coding is required when you want to set it to multichannel.
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Old 10th February 2013, 08:38 AM   #163
mvaldes is offline mvaldes  Italy
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Quote:
Originally Posted by Corpius View Post
Any other changes to the code? This is very easy to implement. If this is all I'll start to add the multichannel option real soon. It will be accessible from the interface, so no additional coding is required when you want to set it to multichannel.
That would be great.
As I remember no other changes are needed
Anyway I just ordered a PCB, so I can test it
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Old 10th February 2013, 08:58 AM   #164
gwikse is offline gwikse  Norway
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Quote:
Originally Posted by Corpius View Post
You got a PM.

Well I have not been doing some proper investigation on the miniDSP products, but I assumed that I can use them to take both analog and digital signals and use it for volume control. Perhaps a descent analog volume control is better.

Thx!
You could allways do what MR. Russ White suggested to me for analog volume control with a COD based DAC.

Quote:
Originally Posted by Russ White @ TPA forum

What you could do if you were using only the SE output of the legato would be to lift the input side of the resistors at the BAL/SE stage and inject the JT in front of it. But that would only work for single ended output. This would also take some value fiddling on the JT to compensate for the impedance into it.

It would be much simpler with IVY3. You would simply put a JT between the first and second stage of each half after removing the first series resistors that form the low pass filter. The JT itself would then provide that impedance since it is almost constant 750R. That solution would work quite well.
I am sure that TPA would give you some hints as to how to control the Joshua tree with your controller.

Edit: If you are running dual mono with seporate IV stages the first suggestion from TPA applies
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Last edited by gwikse; 10th February 2013 at 09:19 AM.
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Old 10th February 2013, 10:00 AM   #165
gwikse is offline gwikse  Norway
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Just a quick question to clarify something.

Will the DAC not be isolated from the controller when using the controller to switch the sidecar?

Edit: PS. Perhaps an idea to have a link to the CE644 Firmware Manual v1.0 on the "Manuals" tab on your site as well as on the "Downloads" section.
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Last edited by gwikse; 10th February 2013 at 10:06 AM.
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Old 10th February 2013, 10:14 AM   #166
Corpius is offline Corpius  Netherlands
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Quote:
Originally Posted by gwikse View Post
Just a quick question to clarify something.

Will the DAC not be isolated from the controller when using the controller to switch the sidecar?

Edit: PS. Perhaps an idea to have a link to the CE644 Firmware Manual v1.0 on the "Manuals" tab on your site as well as on the "Downloads" section.
When connecting D21 directly to the sidecar you need to share grounds. Otherwise it won't work. When sharing grounds there is no isolation anymore. If you want to truly isolate the controller from the DAC you need to use a relay, digital isolator or other solution to isolate the pins for input switching as well.
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Old 10th February 2013, 10:38 AM   #167
gwikse is offline gwikse  Norway
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Quote:
Originally Posted by Corpius View Post
When connecting D21 directly to the sidecar you need to share grounds. Otherwise it won't work. When sharing grounds there is no isolation anymore. If you want to truly isolate the controller from the DAC you need to use a relay, digital isolator or other solution to isolate the pins for input switching as well.
Ok. Thanks
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Old 10th February 2013, 08:28 PM   #168
Corpius is offline Corpius  Netherlands
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Quote:
Originally Posted by mvaldes View Post
That would be great.
As I remember no other changes are needed
Anyway I just ordered a PCB, so I can test it
It's on your way. Let me know what you think of it when you finished it.
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Old 27th February 2013, 04:59 PM   #169
chryses is offline chryses  United States
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Looks very cool. A couple of questions:

1) Have you tested it with an OLED display? Specifically, I'm interested in the New Haven 20x4 OLED displays (e.g., the NHD‐0420DZW‐AY5). I've been wrestling with using a port expander with one of these displays for quite some time (Hacking an Arduino Library to support a NewHaven OLED with an MCP23008 port expander | BuffaloDac). I'm guessing the CE644 probably won't work with this type of display w/o some code modification, but I'd love to be wrong. Ultimately, I may have to give up on this display, but I really prefer the look of an OLED to an LCD.

2) What are the dimensions of the mounting holes on the CE644? The center point of the mounting holes on my New Haven OLED are 93 mm apart in width and 55mm apart in height. Will it fit?

3) Are there enough free pins w/ interrupt functionality to support a second rotary encoder? I'd like to make a system with a dial for controlling input/settings and a dial for controlling volume/mute.
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Old 27th February 2013, 09:35 PM   #170
Zoran is offline Zoran  Serbia
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Thaks
for the example how the documentation should look like
cheers
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