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Old 20th February 2013, 10:03 AM   #601
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Quote:
Originally Posted by houghtkj View Post
Do you know what part is to be used? And what pitch are the pads?

It would appear from the layout the array should be no harder to solder than the WM8804.

Ken
I'm sure the designer will pop in and clarify. In the mean time here is my guess at what package that resistor pack is. It looks like it is a 1206 wide 4 resistor pack. Maybe it is the size up from that, hard to tell.

Here is a pic of another forum project with a pre-soldered resistor pack on it. (Ian takes good photos so I chose his simply because I knew the pics would be clear). See R4, R5, R6 ... they are harder to solder because they don't have individual leads out like the soic chips do.

http://www.diyaudio.com/forums/attac...clockboard.jpg


Other than that resistor pack being a challenge for SMD beginners, the certainly layout looks tidy!

As an constructive alternative option for those keen to do a bit more DIY SMD work here is a project that lets you have PID control of a cheap toaster oven that may make some of this soldering a touch easier, though you've still got to be steady with the solder paste syringe and you need to be careful which toaster oven you select as they won't all get hot enough for Pb-free solder paste. I have a toaster oven here and am just waiting on the controller to arrive in the mail next week . I chose to build one of these because I have a few projects where I want to be able to solder my own QFN and resistor packs and for now I can't justify the expense of a hot air rework station (well not the one I would like anyway).


To the poster earlier considering using this for an 8ch build. You should consider how your clocking will work in that configuration. The mini-sharc has no clock and is the slave on the mclk line. You will need to output the mclk to the minisharc and distribute it to each clock board. This won't be a trivial exercise and you may need to roll your own pcb with clock distribution buffers. Not simple but not impossible, do your research though because you may find that there are simpler options out there for your specific project.

Cheers,
Chris
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Last edited by hochopeper; 20th February 2013 at 10:28 AM.
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Old 20th February 2013, 10:09 AM   #602
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I agree with Ken, the resistor array won't be harder to solder vs WM8804.
And Yes qusp, a short circuit will be hard to debug.
I remember smd diodes in "The Wire HeadPhone" PSU, not really easy, but it was a smallest GB and more skilled people involved.

My opinion : Ain't necessary to add difficulties as it's a large audience project.
That's why there will be testing & evaluation done before the final PCB design.
All your inputs/remarks are welcome

Read carefully Subbus post. PCB pic is a sample intended to be changed and modified...
Quote:
Originally Posted by unixdeveloper View Post
Just to spice up JPs post, here is a sample of what is going to be ordered this weekend for evaluation and testing. More news to follow.

Cheers!
Subbu
Phil

Last edited by korben69; 20th February 2013 at 10:17 AM.
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Old 20th February 2013, 11:57 AM   #603
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Quote:
Originally Posted by hochopeper View Post
Here is a pic of another forum project with a pre-soldered resistor pack on it. (Ian takes good photos so I chose his simply because I knew the pics would be clear). See R4, R5, R6 ... they are harder to solder because they don't have individual leads out like the soic chips do.

http://www.diyaudio.com/forums/attac...clockboard.jpg



Cheers,
Chris

Some VERY tidy soldering on that board Chris - The resistor array up against the QFP must have been quite a challenge though!

However, for "our" board I think everything looks doable without too much trouble.

Ken
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Old 20th February 2013, 01:06 PM   #604
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Added to spreadsheet, thanks
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Old 20th February 2013, 01:21 PM   #605
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Just curious, is the use of SPDIF and I2S mutually exclusive?
I am greedy and want the DAC can connect to more than one digital source.
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Old 20th February 2013, 01:49 PM   #606
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by B&W_arthur View Post
Just curious, is the use of SPDIF and I2S mutually exclusive?
I am greedy and want the DAC can connect to more than one digital source.
You can use a quad channels 2:1 switch like the OTTO2 for I2S switching.

Last edited by syklab; 20th February 2013 at 02:10 PM.
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Old 20th February 2013, 05:05 PM   #607
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Quote:
Originally Posted by jean-paul View Post
Subbu is the one adapting the design for BAL. We both have jobs etc so we struggle along and try to do a V3 in our free time. When a BAL version is ready (if there wil be one at all) Subbu will say so.
I plan on a redesign of the BAL version as soon as we complete the SE version. Priority now is to get the SE out as folks have been waiting long. Hopefully I will find some time to work on the BAL version once SE is completed given that personal & work commitments have been taking away all the free time recently.

Quote:
Originally Posted by qusp View Post
the resistor array is good idea, but its definitely the hardest part on the board to solder and i'm not sure its doing much good how its placed or was it a money saving thing? they are only JUST hand solderable with a normal iron and very easy to create a short circuit without being able to see it easily, do you really need it? have you got much experience soldering them yourself Subbu? for easy soldering they really need reflow or hot air IMO; itrs doable, but a pita with an iron and i've got quite a lot of SMD experience.
On the Resistor pack, it was chosen for better layout of tracks and to avoid layer change. The options thought were either to use a 0603 or resistor pack. Based on the prototype it is possible this might change if we feel its difficult to solder the RP.

Regards,
Subbu
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Old 20th February 2013, 07:24 PM   #608
Ryssen is online now Ryssen  Sweden
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What thruhole electrolyts did you decide on?
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Old 20th February 2013, 08:20 PM   #609
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Still in test phase but BG N or NX series still are my personal favorites. Availability is bad so there are alternatives tested. We will publish when things are interesting enough.
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Old 21st February 2013, 05:59 AM   #610
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Originally Posted by syklab View Post
You can use a quad channels 2:1 switch like the OTTO2 for I2S switching.
Thank you for the information~

In fact, I have the option of building one DAC with SPDIF and the other DAC with I2S.
I have ordered several PCBs.
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