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Old 10th October 2006, 01:51 PM   #11
roender is offline roender  Romania
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Hello ezkcdude,

Your project is very good looking and I like to build one and made some minor changes.
Do you have any PCB boards for sale or you can share gerber and exelon files for your project?

Thank You,
Mihai
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Old 10th October 2006, 02:09 PM   #12
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I don't have those files. I'm doing this using ExpressPCB. I am going to make some minor modifications to the prototype, as well. Then I'd like to do another run. If you'd like to suggest some changes, I'm willing to listen. However, if you take a look at the BOM (and now the "Fancy BOM" that I made), building the current board is not exactly cheap. I don't want to add too much more to the cost or the complexity, or else, I fear losing the "EZ" in EZDAC. That said, the board has plenty of flexibility. For example, you can use external PSU for the op amps, and bypass the I/V section entirely to run your own, if that's desired.

I will admit that now I'd like to learn how to use Eagle, so I can make these Gerber files I keep hearing about .
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Old 10th October 2006, 03:33 PM   #13
Z33 is offline Z33
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Would now be a good time to mention channel select jumpers?


RandyB
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Old 11th October 2006, 12:22 AM   #14
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Is your idea to have one board for each channel and run the DAC in mono mode?
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Old 11th October 2006, 02:22 AM   #15
Z33 is offline Z33
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That's the idea. The eventual target is an active 3-way, using a pair of AF4 boards per channel. Running your DAC in mono would provide a separate output for each XO, and keep the other channel far, far away. It helps that your DAC runs on the same +-15vdc that the XO boards already use, too.

Best channel-separation obtainable, I'd guess, having a decent dedicated DAC for each.

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Old 11th October 2006, 02:50 AM   #16
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It doesn't look easy to put jumpers on pins 1-2. The other problem with that is that it makes the board a little harder for people who don't need that capability. If you want, I can try to do jumpers, and then make a mini-board run specifically for you. You'd get three boards, and I guess you could use the extra for a "normal" 2-channel version. Let me know if you're interested.
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Old 11th October 2006, 01:39 PM   #17
Z33 is offline Z33
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If you're willing to try it, I can certainly pony up for the 3 boards. Offhand, I can't think of another diy DAC that can go mono; yours may be the first, and a pair ought to be just about affordable.

At least in context. Besides 2 DACs, my project needs 2 ladder attenuators, 4 crossover boards, 6 power amplifiers and 3-4 power supplies. Since I'm buying, building and integrating stepwise, it's still do-able on a hobby budget.

RandyB
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Old 11th October 2006, 04:36 PM   #18
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I played around with this last night. It seems to be possible, just needed to move the 3.3V rail around a little bit, and remove some ground plane near those pins. By the way, do you need power supplies? If so, I can do another run of my DIY EZDUAL PSU . It's very cheap and easy to build.
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Old 11th October 2006, 07:35 PM   #19
Z33 is offline Z33
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Cool! I'm using a couple of the 'scalable PSU' boards from the ActiveFilter4 GB a while back, so I'm OK for power, I think. Are you contemplating other changes for the re-spin, or is the current design pretty much complete?

I've been using OPA2134s for everything, and got curious about that AD8610; I put an AD8620 on a BrownDog adapter in my CD5000 last night just to see. Sounds nice.

RandyB
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Old 12th October 2006, 01:57 AM   #20
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Have you though about how to split the SPDIF signal? Will it need to be buffered?
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