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In Reply to: RE: Question on stereo/balanced circuits posted by Blackdog on November 27, 2015 at 18:42:42
***Actually not quite correct. In a true balanced set up the signal goes between the plus and minus and not referenced to ground.***
The typical high-end balanced interface does not follow that model, and each leg of signal indeed moves around the ground.
Follow Ups:
Not disagreeing with you Victor. Just pointing out John's definition was not completely correct.
Dan Santoni
> In a true balanced set up the signal goes between the plus and minus and not referenced to ground.
I realize that the balanced signal is extracted by taking the difference between Pins 2 and 3, but every circuit I've ever seen has a reference point called circuit ground. Therefore, it is my understand that the individual signals on Pins 2 and 3 are always referenced to circuit ground. Are you suggesting this is not the case?
Thanks,
John Elison
In most cases today balanced signals tend to be the 180 deg out of phase referenced to ground type. Same as using a transformer with a center tap. The actual original standard for balanced is signals running between plus and minus with ground ignored. This like a phono cartridge or microphone.
Both work as balanced signals since common mode noise is cancelled. What we're discussing with the OP is the simplest way to implement balanced, with ground referenced. However, where I got that quote I posted is from Ralph Karsten of Atmasphere.
Dan Santoni
So,
If I use an XLR to dual RCA adapter and send the in-phase signal to the left channel of the tube buffer and the out-of-phase signal to the right channel, then use the dual RCA to XLR adapter on the output...
Will the output XLR jack have an actual buffered balanced signal? Can I run it safely into a standard balanced preamp input?
A little complicated, but it will work.
Dan Santoni
No chance of DC offset on XLR signal pins?
Shouldn't have any dc. They're cap coupled are they not.
Dan Santoni
Yes, that makes sense. I hope that left/right gain in my MF tube buffers is spot on.
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