NASA NTRS · 19830000003
Two-Wire to Four-Wire Audio Converter
Abstract
Simple circuit provides interface between normally incompatible voicecommunication lines. Circuit maintains 40 dB of isolation between input and output halves of four-wire line permitting two-wire line to be connected. Balancing potentiometer, Rg, adjusts gain of IC2 to null feed through from input to output. Adjustment is done on workbench just after assembly.
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Talley, G. L., Jr, Seale, B. L.. 1983-08-01. Two-Wire to Four-Wire Audio Converter. https://ntrs.nasa.gov/citations/19830000003
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