Telephone line circuit

Details Telephone line circuit Telephone line circuit

H - Electricity

04

M

379/66, 321/83

H04M 19/00 (2006.01) H02M 3/335 (2006.01)

Patent

CA 1176706

Abstract of the Disclosure A floating, constant power, battery feed circuit wherein a single transformer is used to perform the functions of battery feed and audio coupling, AC feedback is used to control the dynamic output impedance of the circuit. To achieve a constant dynamic output impedance, the amount of AC feedback is controlled by the DC output voltage, which in turn depends on the loop resistance. To achieve a constant audio gain from the switching network to the load, the audio signal from the switching network is multiplied by a signal representing the DC output voltage.

408486

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