Abstract: A transmission line driver circuit especially designed for transmitting nonsymmetrical codes wherein signals to be transmitted are coupled to the lines by means of first and second transformers. A pair of digital logic circuits are connected to said first and second transformers such that positive going pulse signals are transmitted by way of the first transformer and negative going pulses are transmitted by way of the second transformer. Further circuitry is provided for discharging the energy stored in the magnetic field on the first transformer when the second transformer is coupling a pulse to the line and vice versa.