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Old 22nd January 2013, 04:29 PM   #1751
Can you say Audio?
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heh. Yea, caught that too. The world needs more "Wire' Owen - one way or another :-)
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Old 22nd January 2013, 04:44 PM   #1752
IanAS is offline IanAS  England
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What would be nice is if a DAC chip were butted up to the headphone amp chips. With IS input. So I can wire my CMedia DSP, with cross feed, into it and therefore delete analogue interconnect and all the degradation that come with it. A pal tried this with 0.5 metre and 5 metres of cheap microphone cable and could hear no difference.

I'd then want to extrapolate this to having the DAC and amps on the headphone head band with long IS and long DC voltage wires. Thereby deleting the speakers cables and all the degradation that come with it.

But what DAC chip, etc.

I'm thinking of an AK4396 as they are about 5 and available and sound not too bad and have a balanced output to go into the balanced input.

Last edited by IanAS; 22nd January 2013 at 04:50 PM.
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Old 25th January 2013, 06:12 AM   #1753
qusp is offline qusp  Australia
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yeah because signal integrity in long i2s wiring and long low level DC is so much more robust than long analogue interconnects....

(i2s is designed to travel mm between chips on the same PCB, it has no CMRR, it has no error correction at all)

the AKM is a decent choice though, or perhaps the es9016 and modify 'the wire' to have suitable IV resistors. thats what I did with my 'portable' ES9018 + the wire BAL-BAL

the wire is under the blue reg/battery manager/volume control/toslink+BNC input comparator/mcu PCB. It is wired directly to the es9018 dac outputs with ASMP SMD Zfoil IV resistors on 'the wire'

you can see the bling stranded UPOCC silver twisted pair outputs to a Lemo 4 pin, I do have a few long held irrational beliefs left that arent going away any time soon. I still believe in OTT build quality, magic not so much.
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Last edited by qusp; 25th January 2013 at 06:26 AM.
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Old 25th January 2013, 09:29 AM   #1754
IanAS is offline IanAS  England
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Quote:
Originally Posted by qusp View Post
(i2s is designed to travel mm between chips on the same PCB, it has no CMRR, it has no error correction at all)
It's found going much further. The 1980's Philips players had it going from board to board via multiple plugs and sockets and wires. The DAC Magic that I have I think it might be the IS that being fiddled with to create a compliment, then going through multiple vias over about 6 inches.

It may or may not be ideal but analogue wire are certainly not.

When I say that a pal tried it, what I mean is that in the '90's, as a business, he was making and selling outboard PSU's with a long IS umbilical to discerning customers. And not cheap either. It was working well enough.

I might like to use those ESS chips but I can't stretch to the expense at this time. And if I recall correctly I don't like the Buffalo boards, the layout seemed messy with so many other sub board needed. And the price...

Having said that, I just saw this post saying he has a "DIY USB DAC based on the ES9023 Sabre DAC and it only cost me 25" http://www.whathifi.com/forum/dacs/a...-dragonfly-dac

A friend just bought the Audioquest Dragonfly DAC I've not really heard it.

Last edited by IanAS; 25th January 2013 at 09:51 AM.
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Old 25th January 2013, 11:15 PM   #1755
IanAS is offline IanAS  England
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Here's a thread about that tiny Sabre USB DAC: An USB ESS sabre DAC
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Old 25th January 2013, 11:30 PM   #1756
qusp is offline qusp  Australia
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anywhere its found going much further without some sort of reclocking stage is likely to cause at least as much distortion as analogue interconnects, which have only anecdotal distortion at these levels if properly made. it was not designed to be used like that, but of course people still make stupid design decisions

yeah ive seen that dragonfly thing, honestly the marketing department has a lot to answer for, they make a number of ******** impossible claims, particularly about the volume control and headphone amp sections.

re buffalo I know what you mean and agree for the most part, but as you can see i've used only one small dac module. it all went a bit crazy after the buffalo II and some of the tangled messes people called dacs with the BIII are nuts. it would be difficult or impossible to do what I did above with the BIII or even BIIISE rather than the BII
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Old 29th January 2013, 03:51 PM   #1757
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Originally Posted by opc View Post
Hi Emphrygian,

Sorry for the delay... I just checked the layout and both inputs and outputs on the PSU are spaced at 0.125".

They were intended to have wires soldered directly to the pads, so I'm not sure if they make connectors with that pitch. Next time I'll opt for a more standard spacing if there is room.

Cheers,
Owen
Thanks for checking.

It does indeed seem like there are no .125'' terminal blocks at Digikey and I can't be bothered to investigate more, it's not that big a deal. I'll just solder the wires directly to the pads, like you intended.

I had sort of figured I had to do this anyway, since a block would likely not fit with respect to the closeness of the ouput caps (unless I mount them on the back). Blocks on the input would have been nice, but as I said, no big deal.

Last edited by Emphrygian; 29th January 2013 at 03:53 PM.
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Old 29th January 2013, 04:23 PM   #1758
qusp is offline qusp  Australia
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not a huge fan of blocks myself, never use them except sometimes on power supplies. for signal CMRR is more important to me than having a block, if it needs to be able to be disconnected I put an inline connector.
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Old 29th January 2013, 05:05 PM   #1759
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Originally Posted by qusp View Post
not a huge fan of blocks myself, never use them except sometimes on power supplies. for signal CMRR is more important to me than having a block, if it needs to be able to be disconnected I put an inline connector.
I would never consider blocks for signals, only on voltage regs and such. Helps a lot if you want to try out different ones =)
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Old 29th January 2013, 06:19 PM   #1760
qusp is offline qusp  Australia
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yeah I tend to still hardwire, or initially hardwire a dongle type connector on a cable, if its going to stay I just desolder or snip off the connector and solder it.

I mentioned it mainly since we see so many of those things for signal, I really dont get it.
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