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#1 |
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diyAudio Member
Join Date: Aug 2004
Location: Alberta
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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.
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#2 |
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diyAudio Member
Join Date: Dec 2004
Location: Lisboa
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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
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If you want power you must add control |
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#3 |
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diyAudio Member
Join Date: Oct 2004
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Not sure about the pin layout.
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#4 |
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diyAudio Member
Join Date: Jun 2001
Location: Calgary
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#5 |
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Banned
Join Date: Mar 2003
Location: Lisbon, Portugal
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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. |
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#6 | |
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diyAudio Member
Join Date: Dec 2004
Location: Lisboa
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Quote:
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 ?
__________________
If you want power you must add control |
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#7 |
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diyAudio Member
Join Date: Sep 2004
Location: St Louis
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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? |
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#8 |
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diyAudio Member
Join Date: Nov 2005
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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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#9 | ||
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Banned
Join Date: Mar 2003
Location: Lisbon, Portugal
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Quote:
Quote:
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. |
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#10 |
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diyAudio Member
Join Date: Dec 2004
Location: Lisboa
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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.
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