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Old 12th January 2013, 05:01 AM   #11
DQ828 is offline DQ828  Australia
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Originally Posted by SCompRacer View Post
I was hoping you would do the clocking thing sooner so I can figure out what to do with mine.

I like your plan!
Have a look at this if you haven't already Search Results flip H i F i D U I N O
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Old 12th January 2013, 09:10 AM   #12
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At this stage I'm looking at leaving the 5v secondary unused & power the Mega & Relays with the XP Power ECE10US12 12V 10W PSU. It will simplify things & as it will not be connected to the audio side of things shouldn't be a problem. I am using a similar XP Power PSU in the other DAC (it was a leftover from another project) and all seems to be working fine.
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Old 14th January 2013, 07:29 AM   #13
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I thought I'd put the design out before I get too far. I have added the Acko Isolator Reclocker board as it looks like it will make my life easier in the long run.
I'd greatly appreciate any comments.

Does anyone know the best way to power the Acko board & what voltage it needs.
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Old 14th January 2013, 07:36 AM   #14
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Off the top of my head you'll need 3.3V supply to the acko board, unless he has provided a local LDO reg on the board, best to wait for the final BOM before worrying too much about that I think.
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Old 14th January 2013, 07:58 AM   #15
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Originally Posted by hochopeper View Post
Off the top of my head you'll need 3.3V supply to the acko board, unless he has provided a local LDO reg on the board, best to wait for the final BOM before worrying too much about that I think.
I just didn't want to have to squeeze in another power supply rectifer regulator etc once I'd finished the design

The mega has 3.3 & 5V available, the BIII tranny & the other tranny have spare secondaries, so all I would need is a regulator I guess.
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Old 16th January 2013, 06:19 AM   #16
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As the B3SE only has one SPDIF input and I would like to have 2 or 3 SPDIF inputs, I need someway of switching between the inputs.

Does anyone know if there is a small suitable device available to do this?

As I will be controlling the DAC via an Arduino Mega I have the switching capability already on hand, if it is just as simple as installing a couple of relays I would greatly appreciate advice on what would be a suitable relay. I have read that SSR are not suitable for audio signals, but have no idea whether this is valid in all situations.
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Old 18th January 2013, 08:38 AM   #17
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Two layout options, I'd appreciate any thoughts.

The relays down near the AC inlet will probaly go on a PCB & be mounted vertically so they wont take up as much room as on the drawing. Everything is drawn to scale.
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File Type: pdf 13-1-18 DQ DAC 2 Setout 2.pdf (407.9 KB, 56 views)
File Type: pdf 13-1-17 DQ DAC 2 Setout 1.pdf (446.5 KB, 34 views)
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Old 18th January 2013, 08:57 AM   #18
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input and output have LDOs on the isolator/reclocker looks like lt1763 3v3 LDO on the input and a tps type on the output
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Old 18th January 2013, 09:02 AM   #19
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Quote:
Originally Posted by DQ828 View Post
As the B3SE only has one SPDIF input and I would like to have 2 or 3 SPDIF inputs, I need someway of switching between the inputs.

Does anyone know if there is a small suitable device available to do this?

As I will be controlling the DAC via an Arduino Mega I have the switching capability already on hand, if it is just as simple as installing a couple of relays I would greatly appreciate advice on what would be a suitable relay. I have read that SSR are not suitable for audio signals, but have no idea whether this is valid in all situations.
hmm small spdif switch, thats hard, agreed SSR are not a good idea. anything that would be suitable requires a proper PCB as I would only really suggest using some sort of comparator, 3 of them with enable pins. otherwise a MUX or something. not a simple task. if not going to do it really properly you may as well just use a mechanical switch really IMO.
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Old 18th January 2013, 09:04 AM   #20
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Originally Posted by qusp View Post
input and output have LDOs on the isolator/reclocker looks like lt1763 3v3 LDO on the input and a tps type on the output
Sorry, I'm confused?
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