DEVICE FOR MATCHING OF TWO- AND FOUR-WIRE PATHS Russian patent published in 1994 - IPC

FIELD: electric communication. SUBSTANCE: device relates to digital telephone sets used in electric communication equipment. For matching of two-wire and four-wire paths output of first winding of transformer and output of third resistor are connected to collector of transistor which emitter is coupled to second output of resistor and is linked via capacitor to other output of second winding of transformer. Device includes transistor 1, output wire 2 of four-wire path, first resistor 3, supply wire 4, second resistor 5, transformer 6, having first, second and third windings 7, 8, 9, third resistor 10, capacitor 11, input wire 12 of four-wire path, first and second wires 13 and 14 of two-wire path, common wire 15. EFFECT: enhanced transient attenuation between two-wire and four-wire paths with simultaneous simplification of device. 1 dwg