Process controller providing rapid or gradual variations in its output signal

Claim 1

AN ELECTRONIC CONTROLLER CIRCUIT COMPRISING, IN COMBINATION, FIRST AND SECOND SUMMING JUNCTIONS, A HIGH GAIN ELECTRONIC DIRECT CURRENT AMPLIFIER HAVING A SIGNAL INPUT CIRCUIT INCLUDING SAID SECOND SUMMING JUNCTION AND AN OUTPUT CIRCUIT, A NEGATIVE FEEDBACK NETWORK INTERCONNECTING SAID OUTPUT CIRCUIT AND SAID SECOND SUMMING JUNCTION IN A CURRENT SUMMING OPERATIONAL AMPLIFIER CONFIGURATION, INPUT MEANS FOR APPLYING A FIRST AND A SECOND INPUT SIGNAL TO SAID FIRST SUMMING JUNCTION THEREBY BALANCING ONE SIGNAL AGAINST THE OTHER, FIRST IMPEDANCE MEANS CONNECTING SAID FIRST AND SECOND SUMMING JUNCTIONS, SECOND IMPEDANCE MEANS CONNECTING SAID INPUT MEANS FOR SAID FIRST INPUT SIGNAL TO SAID SECOND SUMMING JUNCTION, AND SAID FEEDBACK NETWORK INCLUDING IMPEDANCE MEANS RESPONSIVE TO THE TIME RATE OF CHANGE OF SIGNALS FROM SAID AMPLIFIER, WHEREBY THE APPLICATION OF SAID FIRST INPUT SIGNAL PASSES DIRECTLY TO SAID SECOND SUMMING JUNCTION THROUGH SAID SECOND IMPEDANCE MEANS FOR ESTABLISHING A CHARACTERIZED AMPLIFIER OUTPUT WHOSE FEEDBACK TO SAID SECOND SUMMING JUNCTION IS DELAYED BY SAID FEEDBACK NETWORK IMPEDANCE MEANS AS A FUNCTION OF THE RATE OF CHANGE OF THE OUTPUT SIGNAL FROM SAID AMPLIFIER, AND WHEREIN THE APPLICATION OF SAID SECOND INPUT SIGNAL PASSING FROM SAID FIRST SUMMING JUNCTION THROUGH SAID FIRST IMPEDANCE MEANS TO SAID SECOND SUMMING JUNCTION IS EFFECTIVE WHEN SAID FIRST AND SECOND INPUT SIGNALS ARE UNBALANCED TO ESTABLISH A GRADUALLY VARYING AMPLIFIER OUTPUT.