Oppo DV-981HD output impedance

vizion · 13th May 2008, 10:17 PM

hi,

does anyone know the stereo output impedance of the Oppo DV-981HD ?

thanks.

rossl · 13th May 2008, 10:34 PM

I looked at the circuit a long time ago. If I remember correctly, there is an op-amp per channel, each channel has a coupling cap, a resistor and a mute transistor. The resistor makes the output impedance rather high, but it limits current when the muting transistor is switched in.

I don't use the analog outs of my Oppo 981, so I have not ever experimented with trying to make it sound better. But it would probably make the output impedance much lower if you removed the mute transistors and shorted the current limit resistor.

It might sound better, but I won't guarantee anything

vizion · 14th May 2008, 02:02 AM

is it 100 ohms or 1 kohm ?

rossl · 14th May 2008, 09:12 AM

probably over 1k ohms. I don't think anybody here has seen an official schematic. If someone has, I would like a copy of it

aaudioman · 23rd May 2008, 11:23 AM

output voltage is 2.3v if this is what you were referring to

13th May 2008, 10:17 PM	#1
vizion diyAudio Member Join Date: Apr 2007	Oppo DV-981HD output impedance hi, does anyone know the stereo output impedance of the Oppo DV-981HD ? thanks.

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13th May 2008, 10:34 PM	#2
rossl diyAudio Member Join Date: Nov 2004 Location: Central Ohio	I looked at the circuit a long time ago. If I remember correctly, there is an op-amp per channel, each channel has a coupling cap, a resistor and a mute transistor. The resistor makes the output impedance rather high, but it limits current when the muting transistor is switched in. I don't use the analog outs of my Oppo 981, so I have not ever experimented with trying to make it sound better. But it would probably make the output impedance much lower if you removed the mute transistors and shorted the current limit resistor. It might sound better, but I won't guarantee anything

14th May 2008, 02:02 AM	#3
vizion diyAudio Member Join Date: Apr 2007	is it 100 ohms or 1 kohm ?

14th May 2008, 09:12 AM	#4
rossl diyAudio Member Join Date: Nov 2004 Location: Central Ohio	probably over 1k ohms. I don't think anybody here has seen an official schematic. If someone has, I would like a copy of it

23rd May 2008, 11:23 AM	#5
aaudioman diyAudio Member Join Date: Jun 2006	output voltage is 2.3v if this is what you were referring to

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