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Originally Posted by: Corpius  Which isolator are you using? Can't read it from the picture.
I'm using the ADuM1250. This works perfect. Are you powering side 2 of the isolator from the DAC? I'm using the Si8600 Yes I am powering the bottom side (bottom of picture) of the board from the 5.25v from the Placid HD and running it thru the regulator, which appears to be working fine as I am getting 3.302V at J3 The top side is powered from the Arduino 3.3V I assume with the Si8600 I dont have to lower the Arduino 5v SCL & SDA lines with a level converter first? I'm thinking maybe I had the SCL & SDA lines mixed up, if I have the willpower I will put give it another run tomorrow. Are you using any pullup resistors? . Edited by user Friday, May 3, 2013 1:49:15 PM(UTC)
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A quick look at the datasheet revealed that the Si8600 does the level conversion, so no need to use the level converter. Anyways, you should power it the Arduino side with 5V from the Arduino, unless you are using the Arduino Due.
Yes, I am using (4.7K) pull-up resistors on both sides of the isolator. |
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Well I got it working. I flipped it around and ran the BIII 3.3V to the input side of the isolator & the Arduino 5V to the output side & made sure I had the SCL & SDA lines connected in the right place.
Of course there's always an issue, once the Arduino & BIII where electrically isolated, I got a low level noise thru the speakers that wasn't there before.
The noise goes away if I link BIII & Arduino main ground points.
The only outstanding problem I still have is the DAC turning itself on which has still got me stumped, Iv'e tried a few things but have run out of ideas.
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Originally Posted by: DQ828 Of course there's always an issue, once the Arduino & BIII where electrically isolated, I got a low level noise thru the speakers that wasn't there before. There should be no noise Are you sure that both sides if the isolator are grounded? Arduino powered side: ground from Arduino BIII powered side: ground from BIII Regarding the DAC turning itself on, I think that the problem is most likely an error in the code. Sometimes error's can be hard to spot. |
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Originally Posted by: Corpius Originally Posted by: DQ828 Of course there's always an issue, once the Arduino & BIII where electrically isolated, I got a low level noise thru the speakers that wasn't there before. There should be no noise Are you sure that both sides if the isolator are grounded? Arduino powered side: ground from Arduino BIII powered side: ground from BIII Regarding the DAC turning itself on, I think that the problem is most likely an error in the code. Sometimes error's can be hard to spot. I was wrong, it's not a low level noise, it's actually quite loud. Yes the grounds for the isolator are as you describe. When there is no link (tested continuity between grounds) between the DAC side & the Arduino side the noise is quite load, as soon as I connect the grounds together the noise goes away, very confusing. Having a link between the grounds sort of defeats the purpose of having the isolator. The only thing connected to the Earth wire is the shield on the Tubeizator transformer.
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This project has turned into a real challenge, the garbage bin looks like a very good option at times.
I thought I had all the issues fixed except the turning on problem, which I to thought it was in the code. Then I made some changes to the code & ended up with all sorts of problems (which I think is just coincidence), I reinstated the original code & still had numerous stability issues.
I had decided it's time for major surgery, I have removed the Mega & new screen & will install my older Mega & screen to see if the issue are coming from there, then depending what happens slowly work my way through the wiring.
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I'm starting to think my foray into trying to install the isolator was a mistake, at this stage I can only assume I have done something wrong and upset the applecart while doing it.
The new problems started (I2C related, I think) after I installed the isolator, I then removed the isolator & reinstalled the level convertor that was working fine previously & the I2C communications continued to do strange things. I was getting the volume changing itself etc.
I have removed the new Mega & Screen & installed the old Mega & screen, and everything appears to work except the I2C. When I plug it in the BIII losses LOCK & music, as soon as I unplug the I2C the music plays & the LOCK light comes back on.
I'm open to any suggestions as I am out of ideas.
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 I'm very glad to report, IM AN IDIOT, I had completely forgotten I needed to reset the filters, it's working. In the last 24hrs while the I2C wasn't connected the DAC didn't turn itself on, which it normally would of, so it will be interesting to see what happens now. If the DAC still doesn't turn itself on, it has to be something to do with the other Mega or screen. Edited by user Thursday, May 9, 2013 3:52:30 AM(UTC)
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Kewl! Good job. Amazing sometimes how a solution will present itself. I've been bit by the simple stuff now and then. |
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I'm giving myself an ulcer :)
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The price of out of the norm DIY builds? Just imagine what retail cost would be for what you have. |
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Originally Posted by: Brian Donegan I was/am to mention it at all, since you have your DAC built, and I don't want to be sour. It will probably be just fine the way it is, and I am just nit-picking (I am an engineer after all... "It's what I do").
It's really a problem of using a single-ended I/V stage with a balanced DAC. I'll admit that I am not a fan of the Tube-I-Zator stuff in general, but especially for the Buffalo, since it is not balanced (no common mode cancellation) and has too high of an input impedance to keep the Buffalo from acting as a voltage source.
All that said, people use it and seem to like it, so who am I to call foul. Just enjoy your work... it is a very good build.
Brian This has been bubbling away in the back of my brain, can you recommend a way of doing the conversion that would be suitable for my application.
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Originally Posted by: Corpius Which isolator are you using? Can't read it from the picture.
I'm using the ADuM1250. This works perfect. Are you powering side 2 of the isolator from the DAC? Corpius How did you implement the isolator, ie on a PCB of some sort? Does the ADum1250 do the level conversion?
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Originally Posted by: SCompRacer The price of out of the norm DIY builds? Just imagine what retail cost would be for what you have. Just imagine the DIY cost 
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Originally Posted by: DQ828 Originally Posted by: SCompRacer The price of out of the norm DIY builds? Just imagine what retail cost would be for what you have. Just imagine the DIY cost I have my own reality experience, thanks. ;) |
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It's been running for a few days now & no more glitches. I've only had one source connected so I haven't tried the whole show, don't want to push my luck  , I need a rest before I'm willing to go back for another round. It's looks very much like either the new Mega or the new screen is causing the turn on problem & maybe the other issues. I have attached both with my soldering iron so perhaps I have done something to them. At the moment I am rebuilding DAC 1 & will use the new screen & Mega in that prototype & see what happens. Brian Any thoughts on the best was to do the balanced to SE conversion between the DAC & the Tubeizator.
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You could use a Legato/IVY/VentusEZ or a transformer. Edited by user Sunday, May 12, 2013 7:47:06 PM(UTC)
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Thanks, Iv'e had a look, at this stage I'd rather not add another Transformer & PSU just to run the convertor if I could avoid it. The box is already bigger than originally planned.
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Quote:Any thoughts on the best was to do the balanced to SE conversion between the DAC & the Tubeizator. I would just close my eyes and enjoy the music. :)
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I am with Brian on that one. :) Sometimes that's the best option.
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