Kev
Well-known member
:roll:
Don't think about the ground yet. Stay with the twisted pair and the trafo at each end.
mic - trafo - twisted pair - trafo - you
floating and with some common mode rejection.
AC difference on the mic gets through the trafo and makes an AC difference on the twisted pair and this in turn gets through the next trafo to you.
What is common on the twisted pair is shorted at the trafos. :thumb:
... and no DC connection between you and the twisted pair or mic.
A shield around the whole lot and a metal stake into the ground to help keep bad AC out.
the signal from the mic is + and - with respect to each other and the twisted pair has even lengths and goes through the same noise field ... in fact it is just a loop of wire.
+/- ... difference
twisted pair and a pair of trafos ... balance
:roll:
perhaps it shouldn't be called balanced line ... but differential line
perhaps I should leave the teaching to PRR.
Don't think about the ground yet. Stay with the twisted pair and the trafo at each end.
mic - trafo - twisted pair - trafo - you
floating and with some common mode rejection.
AC difference on the mic gets through the trafo and makes an AC difference on the twisted pair and this in turn gets through the next trafo to you.
What is common on the twisted pair is shorted at the trafos. :thumb:
... and no DC connection between you and the twisted pair or mic.
A shield around the whole lot and a metal stake into the ground to help keep bad AC out.
the signal from the mic is + and - with respect to each other and the twisted pair has even lengths and goes through the same noise field ... in fact it is just a loop of wire.
+/- ... difference
twisted pair and a pair of trafos ... balance
:roll:
perhaps it shouldn't be called balanced line ... but differential line
perhaps I should leave the teaching to PRR.
