y1 gamma-1 DAC

[DeadBoys]

Quote:

Originally Posted by amb /img/forum/go_quote.gif Deadboys, did you try reflowing the solder joints as francisdemarte suggested?

Amb, right after my first post I reflowed U1D, U2D and U3D. I left the power chips alone because they appear to work fine. Should I redo all joints?

On a side note, and to further increase my suspicion of the CS chip's death, could I jumper JP1 on my Y2 to see if I get anything? My understanding is that it just steals the 2707s SPDIF datastream away from the CS's multiplexer.

Cheers

 

[transient orca]

I do have a s/pdif out from my computer. It 'd nice to be able to play 96kHz/24bits stuff, but I guess at $75, that is an very unlikely feature to get.

 

[transient orca]

Quote:

Originally Posted by Beefy /img/forum/go_quote.gif As I said, the Lite version should give you the exact same sound as the Full++. The only difference is connectivity. Unless you specifically need optical and coax input, then there is no need to upgrade anything. And if you do specifically need optical and coax input, then just buy a Full++ anyway.

That is if I can find a used Full++ for sale.

 

[m1abrams]

Quote:

Originally Posted by transient orca /img/forum/go_quote.gif I do have a s/pdif out from my computer. It 'd nice to be able to play 96kHz/24bits stuff, but I guess at $75, that is an very unlikely feature to get.

Look for someone selling a full y1 in the forsale forum, it does not add all that much to get the spdif inputs. However having to redo a y1 to add them and the casework might not be worth it.

You can even post a WTB in the forsale for one, or contact one of the builders from AMB site. I am sure they would gladly give you a quote.

 

[transient orca]

Just searched for sale forum. y1 lite's were for sale quite frequently. Full y1's were much rarer. I found two old threads frrom September and October that didn't explicitly say sold (probably just un-updated). One sells for $150. The other is for $200. I am pretty sure that I would need to pay extra for shipping to Canada. I may be able to take $150, but $200 is out of reach. I can try WTB. It would be a matter of luck. I will take a look at my friend's unit before deciding how to proceed.

 

[m1abrams]

Quote:

Originally Posted by transient orca /img/forum/go_quote.gif Just searched for sale forum. y1 lite's were for sale quite frequently. Full y1's were much rarer. I found two old threads frrom September and October that didn't explicitly say sold (probably just un-updated). One sells for $150. The other is for $200. I am pretty sure that I would need to pay extra for shipping to Canada. I may be able to take $150, but $200 is out of reach. I can try WTB. It would be a matter of luck. I will take a look at my friend's unit before deciding how to proceed.

Well $75 for a built y1 lite is a good deal. ? if the only reason you want SPDIF is for the added ability of 24/96, do you currently have source material in 24/96?

 

[transient orca]

I don't have much right now, but I just discovered places like Linn Records and Magnatune. I may be building up a collection in time.

 

[amb]

Quote:

Originally Posted by DeadBoys /img/forum/go_quote.gif Amb, right after my first post I reflowed U1D, U2D and U3D. I left the power chips alone because they appear to work fine. Should I redo all joints?

At least re-do the joints on the USB board SMD parts, since all you're testing at the moment is USB.

Quote:

On a side note, and to further increase my suspicion of the CS chip's death, could I jumper JP1 on my Y2 to see if I get anything? My understanding is that it just steals the 2707s SPDIF datastream away from the CS's multiplexer.

No. γ2 does not take S/PDIF from the γ1. It takes I2S, which requires the CS8416 to work (and the PCM2707 if you're using USB).

Don't mix the γ2 into the equation until you've completely debugged the γ1 first.

 

[DeadBoys]

Quote:

Originally Posted by amb /img/forum/go_quote.gif At least re-do the joints on the USB board SMD parts, since all you're testing at the moment is USB. No. γ2 does not take S/PDIF from the γ1. It takes I2S, which requires the CS8416 to work (and the PCM2707 if you're using USB). Don't mix the γ2 into the equation until you've completely debugged the γ1 first.

Thanks amb. I reflowed every joint on the USB board today. Unfortunately still nothing

.

I don't know if this was inferred from my other posts but I currently have nothing in SW1D on the Gamma 1, I assume that the pull down the resistors connected to the CS chip are selecting RX0 or have my assumptions shot me in the foot again?

Thanks, as always for any help!

 

[jarpatus]

Yay it's like christmas but better, mailman brought me letter from US and package from local Farnell stock 8) Read: Parts for gamma1 full++. I think amb requested that shipment must be carried by F-22, because how else could it be possible that parts I ordered from amb to Finland arrived the same day than parts from local stock?

I have always hated to do SMD soldering, always seemed like chips had tried their best to reject solder. But hey, this time I made my homework and got some flux. Hey, presto, those chips seemed to be praying for solder 8) It was amazing how easy and fast it was to solder SMD chips with proper tools.

Have to continue tomorrow since I am out of isopropyl alcohol. But I had question also, does it really matter if U9D is MCP101-300D or MCP101-315D? I failed to notice that amb recommended one with higher treshold voltage and ordered MCP101-300D. I will order parts for gamma2 soon so I could order -315D, but if it really does not matter, no point desoldering -300D...

 

[amb]

Deadboys, having no switch installed at SW1D is the equivalent of selecting USB as input.

jarpatus, it doesn't matter whether you use the -300D 0r -315D.

 

[jarpatus]

Quote:

Originally Posted by amb /img/forum/go_quote.gif jarpatus, it doesn't matter whether you use the -300D 0r -315D.

Thanks amb! I soldered gamma-1 together today but as expected, I had forgot something from my order so I need to order few caps and resistors, bugger.

Hoever, that spawned another question. I forgot to order C6D, C10D and C8 which are: "Conductive polymer electrolytic low-ESR capacitor 47µF 10V". In parts list description United Chemi-Con PSA, Sanyo SA or SH (OS-CON) or other similiar is reommended. However Farnell part number (9189505) is for Sanyo SC series having much higher ESR than SA series or United Chemi-Con PSA.

It this ok, or should I order Sanyo SA or SH series, they are also available from Farnell (part numbers 9188673 and 9189335)? Ok, only as 16V versions, but size seems to be the same.

Thanks again!

Best regards,
Jari

 

[MisterX]

Where are you getting the ESR information from?
Check each of the datasheets...
10SC47M = 60
16SA47M = 60
16SH47M = 180

 

[jarpatus]

Quote:

Originally Posted by MisterX /img/forum/go_quote.gif Where are you getting the ESR information from? Check each of the datasheets... 10SC47M = 60 16SA47M = 60 16SH4R7M = 180

Interesting, I am looking Farnell's web site and it lists these values:

10SC47M = 125 mohm
16SA47M = 60 mohm
(they dont stock 16SH4R7M)

Then I checked Sanyos datasheet and it lists the same values than you. So probably Farnell does have wrong specifications listed, surely they cannot sell caps with the same model but different specs?

 

[MisterX]

Quote:

(they dont stock 16SH4R7M)

Sorry, Remove the erroneous "R".

SANYO|16SH47M|CAPACITOR, 47UF, 16V | Farnell United Kingdom

Quote:

So probably Farnell does have wrong specifications listed

Looks that way.