Circuit for switching between balanced networks

Details Circuit for switching between balanced networks Circuit for switching between balanced networks

H - Electricity

04

M

379/66

H04M 7/00 (2006.01) H04B 1/58 (2006.01) H04M 1/76 (2006.01)

Patent

CA 1241784

ABSTRACT A circuit for switching one of two impedance networks to a line carrying AC signals comprising a unity gain amplifier having differential inputs connected across the first one of the impedance networks, and one of the differential inputs and an output connected across the second one of the impedance networks, and a microprocessor control terminal connected to the other of the differential inputs for applying one of either a high impedance or AC ground thereto. The circuit is small, inexpensive, requires no electromechanical parts, and takes up very little circuit board area.

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