[LAU] balanced <--> unbalanced

[Fons Adriaensen]

On Tue, Jan 10, 2017 at 07:15:51PM +0100, Ralf Mardorf wrote:
 
> The difference would be
> 
> balanced out        unbalanced in
>             + ─────
>             - ┐
>             0 ┴────
> 
> to
> 
> balanced out        unbalanced in
>             + ─────
>             - ────┐
>             0 ────┴
> 
> IMO it doesn't make a difference.

Consider that the screen is not a perfect (zero
resistance) conductor and that there can be a
voltage difference 'E' between the two ends
(typically mains hum).

Then compare

 balanced out        unbalanced in
             A ─────
             B ┐
             0 ┴──── E

 signal at input = A - B - E 
 
to
 
 balanced out        unbalanced in
             A ─────
             B ────┐
             0 ────┴ E

 signal at input = A - B 

assuming the output amplifier controls A - B and
not each of them separately w.r.t. it local ground.
For example a transformer output will do that, but
it can also be done without a transformer.

Ciao,

-- 
FA

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