Electronic translator for telephone subscriber circuits - has four-pole network comprising operational amplifier and opto-electronic coupler

摘要

The electronic translator has a four-pole network comprising an operational amplifier with its inputs for the two inputs to the 4-pole network. The amplifier's output is connected to the input of an opto-electronic coupler whose outputs form the 4-pole network's outputs. An ac signal applied between the inputs to the 4-pole network amplitude modulates a current flowing in a loop connected to the outputs. The outputs of this 4-pole network may be connected to the first inputs of two operational amplifiers performing specified functions.