Transistor tracking systems

Claim 1

A TRANSISTOR TRACKING AND SERVO SYSTEM COMPRISING IN COMBINATION TWO TRIGGER CIRCUITS EACH COMPRISING A PAIR OF TRANSISTORS OF OPPOSITE CONDUCTIVITY TYPE TO THE OTHER TRIGGER CIRCUIT OF SAID PAIR, SAID TRIGGER CIRCUITS CONNECTED AT THEIR HIGH POTENTIAL INPUT TERMINALS TO A JUNCTION, TWO SOURCES OF SUBSTANTIALLY EQUAL POTENTIAL AND OPPOSITE POLARITY, SAID SOURCES RESPECTIVELY CONNECTED TO EACH OF SAID TRIGGER CIRCUITS TO ENERGIZE THE TRANSISTORS THEREOF TO CONDUCT IN A FORWARD DIRECTION, ONE OF THE TRANSISTORS IN EACH SAID TRIGGER CIRCUIT CONNECTED TO BE NORMALLY CONDUCTING AT A LOW SATURATION VOLTAGE IN RESPONSE TO INPUT SIGNALS BELOW A PRESELECTED REFERENCE VALUE IN THE POLARITY OF ITS ENERGIZING SOURCE, THE OTHER SAID TRANSISTOR IN EACH SAID TRIGGER CIRCUIT CONNECTED TO BE TRIGGERED TO CONDUCT AT A SUBSTANTIALLY HIGHER LEVEL OF CURRENT CONDUCTION THAN THAT OF SAID ONE TRANSISTOR IN RESPONSE TO INPUT SIGNALS ABOVE SAID PRESELECTED VALUE IN THE POLARITY OF ITS ENERGIZING SOURCE, SAID TRIGGER CIRCUITS CONNECTED AT THEIR OUTPUT TERMINALS TO A SUMMING POINT FOR SUMMING THE OUTPUTS OF SAID TRIGGER CIRCUITS, A SOURCE OF DIRECT CURRENT SIGNAL WHICH VARIES IN AMPLITUDE AS A FUNCTION OF TIME CONNECTED TO SAID JUNCTION AT THE INPUT TERMINALS OF SAID TRIGGER CIRCUITS, AN ALTERNATING CURRENT SIGNAL SOURCE CONNECTED TO SAID JUNCTION AT THE INPUT TERMINALS TO SAID TRIGGER CIRCUITS, FOR IMPRESSING ON SAID JUNCTION, SUPERPOSED ON SAID DIRECT CURRENT SIGNAL, A BALANCED ALTERNATING CURRENT SIGNAL VOLTAGE OF SUBSTANTIALLY UNIFORM PERIOD AND AMPLITUDE HAVING PEAK VALUES EXCEEDING SAID PRESELECTED VALUE, A CHARGE STORING CIRCUIT CONNECTED TO SAID SUMMING POINT AND CONSTRUCTED AND ARRANGED TO BE CHARGED FOR DISCHARGED IN RESPONSE TO THE AMPLITUDE AND POLARITY OF THE SUM OF THE OUTPUT SIGNALS FROM SAID TRIGGER CIRCUITS, SENSING MEANS CONNECTING TO SAID CHARGE STORING CIRCUIT FOR SENSING THE VOLTAGE THEREACROSS WITHOUT SUBSTANTIALLY DISCHARGING SAID CHARGE STORING CIRCUIT, AND MEANS CONNECTED TO SAID SENSING MEANS FOR CONSTANTLY COMPARING THE AGGREGATE POTENTIAL ACROSS SAID CHARGE STORING CIRCUIT WITH A SELECTED POTENTIAL, TO PRODUCE A VOLTAGE OUTPUT OF SAID COMPARING MEANS WHICH IS FUNCTION OF THE AMPLITUDE OF THE DIRECT CURRENT POTENTIAL ACROSS SAID OUTPUT TERMINALS AND OF OPPOSITE POLARITY THERETO, SAID OUTPUT VOLTAGE BEING RELATIVELY LARGE WHEN THE AMPLITUDE OF SAID DIRECT CURRENT SIGNAL EXCEEDS A PRESELECTED VALUE, AND SUBSTANTIALLY SMALLER WHEN SAID AMPLITUDE IS LESS THAN SAID PRESELECTED VALUE.