Handbook
Redbox User Handbook No 2
19
6 RB-PLI6 6 Way Mono Passive Line Isolation Unit
Introduction
Fig 6-1: RB-PLI6 Front Panel.
The RB-PLI6 6 way mono passive line isolation unit is used to isolate audio signals from inter
area ground hum loops, which could be caused by equipment being powered by dierent
mains power supplies or phases on the same supply.
The input and output are connected together through a transformer and the unit has
internal jumpers allowing the inputs and/or outputs to be balanced about ground. The unit
requires no mains power for operation.
This unit is useful where audio is required to be driven over a relatively long length of cable.
By isolating the signal using transformers, ground loop currents that can be present in non-
isolated signals, are eradicated completely.
System Block Diagram
Fig 6-2: RB-PLI6 System Block Diagram.
MATCHING CONVERTERS - RB-PLI6
MATCHING CONVERTERS
6
Ground Balancing
Input Output
X6