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Post by Deleted on Sept 28, 2012 14:38:33 GMT
My PK is finally singing and what a beautiful voice she has!!!! It has taken a little (a lot) longer than initially expected but so far the wait was absolutely worth it. I'll be playing in async mode mode for a couple of days while the boards burn in a bit. Next week I'll change to sync. A huge thanks to all those who helped me make an I2S DAC a reality (Will, Alex, Frans, Chris, etc,) and specially to Shaun to who I owe 98% of this project
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Post by Deleted on Sept 28, 2012 18:41:25 GMT
Hi Javier, well done on the PK front, that looks a neat job, I take it you are using the Amanero board I'm somewhere in the second tranche for that one. Having two working PK boards I'll butcher the second one when my Amanero arrives and see what I think of I2S, looking forward to that. Alan PS Agreed that Shaun is a cracking fella
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Post by Deleted on Sept 28, 2012 20:14:24 GMT
Hi Javier, well done on the PK front, that looks a neat job, I take it you are using the Amanero board I'm somewhere in the second tranche for that one. Having two working PK boards I'll butcher the second one when my Amanero arrives and see what I think of I2S, looking forward to that. Alan PS Agreed that Shaun is a cracking fella Thanks Alan. You are correct, the small board on the right far end is the Amanero USB board connected to the I2S inputs of the PK. I'm delighted wit the combo, it really sounds amazing even in this provisional state. I guess inside a proper case and with a few optimizations here and there it could still improve a bit. The only thing that needs a little polishing are the Amanero drivers. Nothing serious but they are not as solid and reliable as they could be. Domenico has said that he'll be releasing ASIO ones soon, lets hope those have these silly bugs fixed. Next step, a native DSD DAC.
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Spirit
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Post by Spirit on Oct 3, 2012 10:07:42 GMT
I don't know what genius thought not getting regulator boards in the GB was a good idea, but seemingly this genius here. Perhaps I thought I was going to use batteries.
Got 2 DAC boards and 2 JLH REs.
Is it possible to easily modify the Jaycar headphone amp PSU kit to supply 3.3V?
Or does anyone have any single? reg boards left?
Cheers, Phil
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Post by Deleted on Oct 3, 2012 10:34:02 GMT
Hi Phil See my new email, Kind Regards Alex
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Post by Deleted on Oct 3, 2012 10:40:27 GMT
My PK is finally singing and what a beautiful voice she has!!!! It has taken a little (a lot) longer than initially expected but so far the wait was absolutely worth it. I'll be playing in async mode mode for a couple of days while the boards burn in a bit. Next week I'll change to sync. A huge thanks to all those who helped me make an I2S DAC a reality (Will, Alex, Frans, Chris, etc,) and specially to Shaun to who I owe 98% of this project Hi Javier Looks like I missed seeing this post. Well done ! Now to really put you on the spot, and ask you for a subjective answer. Have you also tried it without the JLH PCBs in line after they have at least 48 hours on them ? Kind Regards Alex
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Spirit
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Post by Spirit on Oct 3, 2012 11:31:45 GMT
So after all that, I've just had a chat to the mate who I'll be building this for.
We *are* going to go down the battery route. Shall use an arduino or something to trigger battery charging based on whether there's an input signal from the spdif, and stop charging when they're full (if the charger doesn't do this properly by itself over the longer term).
Jeff (or anyone else) - does this seem reasonable?
Does anyone have any info on the longevity of the A123 batteries when used in applications such as these?
Cheers, Phil
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Post by Deleted on Oct 3, 2012 11:51:41 GMT
So after all that, I've just had a chat to the mate who I'll be building this for. We *are* going to go down the battery route. Shall use an arduino or something to trigger battery charging based on whether there's an input signal from the spdif, and stop charging when they're full (if the charger doesn't do this properly by itself over the longer term). Jeff (or anyone else) - does this seem reasonable? Does anyone have any info on the longevity of the A123 batteries when used in applications such as these? Cheers, Phil Phil You asked earler about possibly using the SC HA PSU. If you were to do what I did with one of those PSUs in the SC DAC, and drill another couple of holes to take a 7805 with a small heatsink in series with the existing 7805, you could then replace the 7805 there presently in the unused +5V supply with an LM3940 regulator from Jaycar. It is a LDO type with the same pinout as a 7805 , but works with +5V , or up to +5.5V at it's Input .It is +3.3V at 1Amp. Alex
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Spirit
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Post by Spirit on Oct 3, 2012 12:38:20 GMT
Phil You asked earler about possibly using the SC HA PSU. If you were to do what I did with one of those PSUs in the SC DAC, and drill another couple of holes to take a 7805 with a small heatsink in series with the existing 7805, you could then replace the 7805 there presently in the unused +5V supply with an LM3940 regulator from Jaycar. It is a LDO type with the same pinout as a 7805 , but works with +5V , or up to +5.5V at it's Input .It is +3.3V at 1Amp. Alex Cheers for that Alex - I'll do that with the second DAC.
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Post by Deleted on Oct 3, 2012 13:57:15 GMT
Hi Javier Looks like I missed seeing this post. Well done ! Now to really put you on the spot, and ask you for a subjective answer. Have you also tried it without the JLH PCBs in line after they have at least 48 hours on them ? Kind Regards Alex I haven't tried it without the JLHs yet and won't for some time. I made a mistake when reconnecting for sync mode and fried the Sabre chip. I have already ordered replacement ones and as soon as they arrive I'll send them over to Chris otgether with the board for replacing. I was very lucky the Amanero board had protection against this and wasn't dammaged.
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Post by Deleted on Oct 4, 2012 2:38:16 GMT
Hi Javier I am very sorry to hear that. It's especially annoying when you know you have made real progress.I try to avoid problems like that wherever possible by using the same kinds of colour wires for the PSU area in almost everything I make, but sometimes we press on late at night when we know we should really wait for another day. Kind Regards Alex
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Post by Deleted on Nov 2, 2012 13:47:04 GMT
For anyone who may be looking for plugs to make the I2S connection for experimenting on this board; (very handy for SYNC/ASYNC change overs) I tracked down these. Complete with sizing so you can spot them elesewhere too. They go together fine.....
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Post by Deleted on Nov 2, 2012 20:58:27 GMT
For anyone who may be looking for plugs to make the I2S connection for experimenting on this board; (very handy for SYNC/ASYNC change overs) I tracked down these. Complete with sizing so you can spot them elesewhere too. Nice heads up Chris
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Post by Deleted on Nov 15, 2012 23:22:54 GMT
Managed to get a result today. I was going over my first, presumed dead, PK. All the same tests and all the same results that said it should work in SYNC mode (already now know oscillator is dead). So I thought stuff it, de-populate all except the Sabre chip and work my way through. Anyway, I found a drifted pad under my plug for the I2S in, the MRCLK was only talking when probed, left alone nada! A quick bit of bodgery later y voila! SYNC working fine. Cheshire cat smile ensues The weirdest unexpected thing though, the two boards sound different! There are differences in capacitor quality but values and type are the same as can be seen below. I've not changed back and forth to be able to say x is better than y but different they are. So any cap-choice doubters take note
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Post by Deleted on Nov 16, 2012 14:05:45 GMT
Hi Chris great result. yes those caps certainly do make a difference and with the handy cushion of two boards you could have a play with one and leave the other as is. those Gnats Poo ones may be worth a try if you feel like a change. take care
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Post by Deleted on Nov 16, 2012 14:28:29 GMT
Anyway, I found a drifted pad under my plug for the I2S in, the MRCLK was only talking when probed, left alone nada! A quick bit of bodgery later y voila! SYNC working fine. That is good news Chris! well done.
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Post by Deleted on Nov 16, 2012 18:00:45 GMT
I've read at the DIYA Amanero's thread that it is recommended to twist the I2S signal cables with GND ones. I haven't had any drop out or noise problems without it but just in case.... Doing this would be quite easy on the Amanero's side as there is a GND pin behind each signal pin but what about on the PK's side? is there any GND point close to the entry points that could be used? I wouldn't like taking the GNDs to the PS header leaving a bit of a cable mess.
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Post by Deleted on Nov 16, 2012 19:03:56 GMT
Yeah, I read that too but likewise have no discernable noise now anyway.
I suppose we should try....
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Post by Deleted on Nov 16, 2012 19:06:40 GMT
Thanks Javier and Shaun, I'd forgotton about those! If gonna do the do, Better use a gnats poo
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Post by Deleted on Nov 16, 2012 22:14:56 GMT
Thanks Javier and Shaun, I'd forgotton about those! If gonna do the do, Better use a gnats poo Hi Chris Are they a "trade secret"? Visitors from DIYAudio and others wouldn't have a clue what a "gnats poo" is. Kind Regards Alex P.S. Don't forget that even the mighty Salas shunt (and some other SuperRegs) may sound too fatigueing when used in some areas. Shaun has found that the type of capacitor in the "Sense"area (and probably elsewhere) can vary the ultimate sound a little , just as it does with the type of 100uF electro in the JLH..
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Post by Deleted on Nov 16, 2012 22:17:09 GMT
I've read at the DIYA Amanero's thread that it is recommended to twist the I2S signal cables with GND ones. I haven't had any drop out or noise problems without it but just in case.... Doing this would be quite easy on the Amanero's side as there is a GND pin behind each signal pin but what about on the PK's side? is there any GND point close to the entry points that could be used? I wouldn't like taking the GNDs to the PS header leaving a bit of a cable mess. Good thinking 99 !
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Post by Deleted on Nov 16, 2012 23:45:42 GMT
Gnats poos are some real crazy sh1t maaan! They are SMT caps, 2.2uf/6.3v/X7R/0603 as expertly installed by Jeff below cheers.. jeffc
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Post by Deleted on Nov 16, 2012 23:49:36 GMT
I wouldn't like taking the GNDs to the PS header leaving a bit of a cable mess. I'm thinking twist the grounds and signals up to the last point possible before the input on the PK, then attach the grounds to a single, larger guage ground lead and thence to the PSU in header
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Post by Deleted on Nov 18, 2012 18:46:17 GMT
Just for the hell of it I tried the above even though I had no problems with noise or drop outs before.
My only possible mistake was that the lead ended up being longer. However, there is zero sonic difference between the new and the old.
Yertiz;
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pagan
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Post by pagan on Nov 19, 2012 12:07:52 GMT
Just for the hell of it I tried the above even though I had no problems with noise or drop outs before. My only possible mistake was that the lead ended up being longer. However, there is zero sonic difference between the new and the old. Yertiz; You could try thin coax instead.....
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