Capacitor at voltage DAC output

Ryssen · 16th August 2011, 09:03 PM

It is very popular to put a transformer at output of e.x CS4398 and AK4398.
But how about putting 2 high quality capacitors.
Would they sound worse?
Anyone compared?

RayCtech · 16th August 2011, 09:31 PM

Quote:

Originally Posted by Ryssen

It is very popular to put a transformer at output of e.x CS4398 and AK4398.
But how about putting 2 high quality capacitors.
Would they sound worse?
Anyone compared?

Why not connect directly without either transformer or capacitor?
Then there is zero degradation of the audio signal.

Ryssen · 16th August 2011, 09:40 PM

There´s 2v DC on the DAC´s output,the trafo or the caps blocks the DC so it wont reach the preamp or the amplifiers input.

RayCtech · 16th August 2011, 10:04 PM

Quote:

Originally Posted by Ryssen

There´s 2v DC on the DAC´s output,the trafo or the caps blocks the DC so it wont reach the preamp or the amplifiers input.

Just make a virtual ground with two resistors from the plus voltage to ground. The midpoint are at the DAC output voltage.
50 or 100 ohm works OK.
A JFET buffer makes it even better, but the resistors alone sounds much better than capacitors or transformers.

Ryssen · 10:30 PM

You mean

Out - ---100ohm----__ Output to preamp
AK4398 Out + ---100ohm----

Sorry but it gets distorted when I posts.
Hope you can se what i mean.

RayCtech · 17th August 2011, 08:53 AM

Quote:

Originally Posted by Ryssen

You mean
Out - ---100ohm----__ Output to preamp
AK4398 Out + ---100ohm----

Sorry but it gets distorted when I posts.
Hope you can se what i mean.

One resistor from the DAC PSU +voltage to virtual GND.
One resistor from the virtual GND to the real GND.
The virtual GND (midpoint between the resistors)
will now have the same voltage DC potential as the DAC outputs.

The "real" GND must not be used as it is the virtual GND you connect to your amplifier.

Ryssen · 17th August 2011, 10:43 AM

But what if the amp after doesn´t have floating ground,wont the virual ground get shorted then?

RayCtech · 17th August 2011, 07:36 PM

Quote:

Originally Posted by Ryssen

But what if the amp after doesn´t have floating ground,wont the virual ground get shorted then?

I use only ONE connection to mains ground to avoid ground loops...

16th August 2011, 09:03 PM	#1
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	Capacitor at voltage DAC output It is very popular to put a transformer at output of e.x CS4398 and AK4398. But how about putting 2 high quality capacitors. Would they sound worse? Anyone compared?

16th August 2011, 10:28 PM	#5
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	You mean Out - ---100ohm----__ Output to preamp AK4398 Out + ---100ohm---- Sorry but it gets distorted when I posts. Hope you can se what i mean. Last edited by Ryssen; 16th August 2011 at 10:30 PM.

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16th August 2011, 09:40 PM	#3
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	There´s 2v DC on the DAC´s output,the trafo or the caps blocks the DC so it wont reach the preamp or the amplifiers input.

17th August 2011, 10:43 AM	#7
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	But what if the amp after doesn´t have floating ground,wont the virual ground get shorted then?

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