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Budget DIY DAC? - Page 2

post #16 of 42
Populated the boards, and threw it into a temp box that I made from scrap pieces of wood at the wood shop. All the plugs and were sent home back in cali, so I'll be finishing it up there and maybe get a listen to it with the Apache at the SD meet. First DIY electronics project of mine, hopefully it works on power on

post #17 of 42
Haha, I'm sure you'll be ok. I can't see the pic, but maybe it's just something blocked by our proxy here at work.

I actually ordered the completed boards for DAC x 2, receiver, power supply, and toroid last weekend. I guess it shipped out yesterday (thank gods I don't have to wait for their next batch!), so I should get it by Monday, maybe tomorrow if I'm lucky. I'm hoping I'll get it done in time to take down to the MD meet with me.

What are you casing yours in? I picked up a 12" x 12" x 4" Par-Metal 20 series case that I'll be finishing the same way I did my Beta22's 16x16x4 Par-Metal case. I'm still trying to decide on a layout (I know I have plenty of space), particularly for the front panel. I don't think I'll be using a power switch, so the only thing I may put on the front is a switch for selecting between two coax jacks, if I decide to add more than one. I can't help but think it'd look odd with a single switch, or even blank.
post #18 of 42
I'm still figuring out a design for the case, the current case is literally something I threw together in about a hour including painting and drying time Whatever the design will be, it'll be some sort of wood integrated into the entire case, not just the front panel. I thought of putting in more than one jack, but I don't think I'm going to bother; I don't believe I'll have that many sources to begin with anyways

What's a good power switch to use? I forgot to order one, and when I do a search for "power switch" on mouser I get some 300 results
post #19 of 42
Well, I have a rocker switch on the back of my Beta22. Once I get to work I'll look at my Mouser invoice and find the part number. It works well enough, but I think I'd want something prettier and more shiny if I was going to mount it on the front panel.
post #20 of 42
Part # is 612-RC1073-K

I just read through the diyAudio Opus thread...looks like they'll be changing over to a Wolfson transceiver (which includes spdif receiver) sometime soon, so I'll keep an eye on that, as the Wolfson is supposed to be very good at dealing with jitter.
post #21 of 42
Thanks for the part number, that'll definitely help me out a bit. Yea, I saw the wolfson transceiver, I'm looking forward to it as well
post #22 of 42
Just got my Opus pretty much done. You're in for a treat...it sounds phenomenal!
post #23 of 42
got pictures? particularly of how you wired it all up? I want to make sure I don't make any noob mistakes and fry it on power on
post #24 of 42
Quote:
Originally Posted by Nebby View Post
got pictures? particularly of how you wired it all up? I want to make sure I don't make any noob mistakes and fry it on power on
Same here, I want to see it, btw, what is the "controller" terminal block for? What do you hook up there? What functions do the jumpers control?
post #25 of 42
Sorry, had to recharge my camera's batteries

colonelkernel8: The controller terminal is if you want to control the DAC through software, usually with a microcontroller. I think most people won't be using that block (I didn't).

Pics:









post #26 of 42
as far as using two DAC boards, how is this accomplished so each board will be using its full potential for one channel. Im thinking if all you do is use two boards, you will only be using half of the board; it might just make sense to use just one board.

How did you order yours? they are out of stock on everything!
post #27 of 42
Quote:
Originally Posted by colonelkernel8 View Post
as far as using two DAC boards, how is this accomplished so each board will be using its full potential for one channel. Im thinking if all you do is use two boards, you will only be using half of the board; it might just make sense to use just one board.
I assume the DACs are being used in dual differential mode. Although they're stereo DACs, they can acheive better SNR in mono using 2 pairs of differential outputs on each DAC. Presumably the board designer made it easy to operate the DAC in stereo or mono mode using some pull up/down resistors or jumpers. So you could buy just one board if you wanted and configure it for stereo. There is a pin on each DAC, you pull it low on one DAC and it'll take the, say, left data from the I2S stream, pull it high on the other DAC and it'll nab the right channel data.

Currently working on my own DAC with dual WM8740s - they're both going to be on the same board though which makes a bit more sense to me. Surprised Opus don't seem to do these?
post #28 of 42
fierce, how long ago did you order your stuff? They are pretty much sold out of everything. I really want to build one of these.
post #29 of 42
I ordered one of the last few boards they had left at the moment (ordered saturday or sunday two weeks ago). They've got another batch of boards ordered, though (with the new receiver board) that they should probably have in the in 3-4 weeks.

I think the Opus design team was going for simplicity and modularity with their design, and I also think they think most will just go with a single DAC chip (supposedly not much audible difference, but I just wanted to get what I could out of it).
post #30 of 42
Most of TPA's stuff is modular, if you look thru their other projects they're nearly all designed with modularity in mind. My next project assuming the Opus dac works, will be the TXO speaker amp.
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