Current Detector For Private Branch Exchange Extensions, Trunks And Tie Lines
Original Publication Date: 1979-Mar-01
Included in the Prior Art Database: 2005-Feb-20
The circuit shown above is used for detecting the relatively high loop current in the secondary winding of the line transformer in a private branch exchange system (PBX). Although power supply voltage +V is high, about 24 volts, the circuit can be easily integrated.