Rank: Member
Groups: Member
Joined: 4/18/2009(UTC)
Posts: 27
Location: UK
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Hello Russ / Brian / All, I am hoping for some advice on how best to configure my AES / EBU ground. I have recently changed source to froma a fire wire interface with SPDIF to a PC with Lynx AES16 card and have used a resistor network to drop the voltage from approx 3.5v to 0.5v, the DAC works perfectly but is now prone to loose lock when spikes ocur in the mains due to light switches etc, it didnt do this at all using spdif so i am guessing its either coming through the pc / lynx card or my AES/EBU input is not ideal. At the moment i have a XLR panel socket in my chasis for the AES in; pin 2 & 3 go via voltage divider to DAC but pin 1 gnd is not connected to anytghing and is left floating. I tried connecting pin 1 to chassis as per the rane document on shield / grounding but the dac would not lock onto the signal so i presume this setup is not compatible with my chassis ground scheme - which is buffalo and Placids not connected to chassis or ground at any point and left floating only the IEC inlet GND is connected to the chassis. If i ground the AES shield to chassis do i also have to gnd the Buffalo to the chassis? If yes whats the best way to do this? Also out of interest i checked the wave form with my scope meter before the resistor network and it was pretty clean and well formed, after the resistors and subsequent level drop it wasnt so clean and lastly when connected to the powered buffalo spdif inputs it becomes quite noisy - i am waiting for a 1:1 Lundahl AES input transformer and intend to arrange the input as per the MUX schematic, will this do a better job of preserving the signal?  Any advice appreciated and sorry for the long post...Dac sounds really goog btw but just want to make sure i have it setup best possible. Also is the the new IVY2 likely to be a noticable improvement over the integrated IVY2? Cheers, Luke
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Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
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HI Luke,
What value resistors are you using for the divider?
I would try tying pin1 to signal GND. It does not hurt to try.
In regard to IVY II, it is a better cct than the original IVY.
Cheers!
Russ
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Rank: Member
Groups: Member
Joined: 4/18/2009(UTC)
Posts: 27
Location: UK
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Hi Russ,
I am using 2 x 56 ohm resistors in series with a 22 ohm connected in between the two 56 ohm and goign to signal gnd.
Will try tying pin1 to signal gnd as suggested,
Thanks,
Luke
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