XLR / Balanced cable chipamp

akunec · 14th January 2006, 06:34 PM

does anyone have a design to use a chipamp differentially with XLR cables... I have a DCX 2496 and would like to stay balanced to minimize noise.

XELB · 14th January 2006, 07:03 PM

Since you allready have a source with ballanced output, I think you can buy four LM3886 single ended boards and use two per channel.
Some members sell LM3886 boards

jaudio · 14th January 2006, 07:05 PM

Not sure about the pin layout.

paulb · 14th January 2006, 07:20 PM

http://www.diyaudio.com/forums/showt...901#post212901

carlosfm · 14th January 2006, 07:22 PM

akunec is not asking for bridge, he is asking for a balanced design.
You don't need two chips, a single LM3886 chip converts balanced to unbalanced, like any op-amp does, and of course with the advantage of noise rejection.

XELB · 14th January 2006, 07:32 PM

Quote:

Originally posted by carlosfm
akunec is not asking for bridge, he is asking for a balanced design.
You don't need two chips, a single LM3886 chip converts balanced to unbalanced, like any op-amp does, and of course with the advantage of noise rejection.

He said that he would like to stay balanced.....

You are advising to convert the balanced input to a single ended output...
Or it's my confusion ?

joster · 14th January 2006, 07:39 PM

I've been considering the same thing, also for use after a DCX. I don't beilieve it should be too complicated. I think it needs reduced gain due to the higher input voltage from a balanced source, and from what I've seen the input impedance is usually lower, perhaps to keep the resistance in the feedback loop close to the input impedance. I don't know much about this, but I think others might be interested considering the size of the DCX thread and the ease of implementation of chipamps.

You could also put a balanced input buffer in front of the chipamp, but i would try to do it without added components.

I have no pcb software design skills.

Perhaps one of the gc gurus would start us on the path?

poobah · 14th January 2006, 07:42 PM

akunec,

Post the schematic of your LM3886 circuit... We can show you how to make a differential (balanced) input amplifier.

EDIT:

Do you want to drive XLR cables with chip amp?

Or drive a chip amp with XLR cables?

carlosfm · 14th January 2006, 07:42 PM

Quote:

Originally posted by XELB
He said that he would like to stay balanced.....

He didn't say he wanted balanced up to the speakers.

Quote:

Originally posted by XELB
You are advising to convert the balanced input to a single ended output...
Or it's my confusion ?

That's right, balanced input to the LM3886, which converts to unbalanced out to the speakers.
This way the (power) op-amp rejects any noise present in the signal, bridged does not.
That's what akunec means by 'would like to stay balanced to minimize noise'.
'Stay balanced' between the DCX 2496 and the amp, that's it.

XELB · 14th January 2006, 07:48 PM

But Carlos, you can also minimize noise and lower the distortion if the ouput is differential...

I think it's better that akunec explain the context.

14th January 2006, 06:34 PM	#1
akunec diyAudio Member Join Date: Aug 2004 Location: Alberta	XLR / Balanced cable chipamp does anyone have a design to use a chipamp differentially with XLR cables... I have a DCX 2496 and would like to stay balanced to minimize noise.

14th January 2006, 07:03 PM	#2
XELB diyAudio Member Join Date: Dec 2004 Location: Lisboa	Since you allready have a source with ballanced output, I think you can buy four LM3886 single ended boards and use two per channel. Some members sell LM3886 boards __________________ If you want power you must add control

14th January 2006, 07:48 PM	#10
XELB diyAudio Member Join Date: Dec 2004 Location: Lisboa	But Carlos, you can also minimize noise and lower the distortion if the ouput is differential... I think it's better that akunec explain the context. __________________ If you want power you must add control

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14th January 2006, 07:20 PM	#4
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	http://www.diyaudio.com/forums/showt...901#post212901

14th January 2006, 07:22 PM	#5
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	akunec is not asking for bridge, he is asking for a balanced design. You don't need two chips, a single LM3886 chip converts balanced to unbalanced, like any op-amp does, and of course with the advantage of noise rejection.

14th January 2006, 07:39 PM	#7
joster diyAudio Member Join Date: Sep 2004 Location: St Louis	I've been considering the same thing, also for use after a DCX. I don't beilieve it should be too complicated. I think it needs reduced gain due to the higher input voltage from a balanced source, and from what I've seen the input impedance is usually lower, perhaps to keep the resistance in the feedback loop close to the input impedance. I don't know much about this, but I think others might be interested considering the size of the DCX thread and the ease of implementation of chipamps. You could also put a balanced input buffer in front of the chipamp, but i would try to do it without added components. I have no pcb software design skills. Perhaps one of the gc gurus would start us on the path?

14th January 2006, 07:42 PM	#8
poobah diyAudio Member Join Date: Nov 2005	akunec, Post the schematic of your LM3886 circuit... We can show you how to make a differential (balanced) input amplifier. EDIT: Do you want to drive XLR cables with chip amp? Or drive a chip amp with XLR cables?

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