Transduction system including current regulation

Claim 1

A TRANSDUCTION SYSTEM HAVING A LOAD CIRCUIT INCLUDING A D.C. POWER SOURCE, A LOAD RESISTANCE, AND A TRANSISTOR; SAID TRANSISTOR HAVING SAID LOAD RESISTANCE AND SAID SOURCE CONNECTED IN SERIES BETWEEN ITS EMITTER AND ITS COLLECTOR, AND BEING ARRANGED SO THAT CURRENT FLOWS THROUGH SAID LOAD RESISTANCE AS A FUNCTION OF THE VOLTAGE BETWEEN SAID EMITTER AND THE BASE OF SAID TRANSISTOR; CIRCUITRY CONNECTED IN PARALLEL WITH SAID LOAD RESISTANCE TO RECEIVE CURRENT FROM ONE SIDE OF SAID SOURCE, AND A DIODE CONNECTED TO SAID CIRCUITRY AND ARRANGED TO RETURN THE LAST SAID CURRENT TO SAID SOURCE; SAID DIODE BEING SO POLED AS TO BE FORWARD BIASED WITH RESPECT TO THE SAID LAST SAID CURRENT, THE SOURCE SIDE OF SAID DIODE BEING CONNECTED TO SAID EMITTER, AND THERE BEING RESISTANCE CONNECTING THE OTHER SIDE OF SAID DIODE TO THE BASE OF SAID TRANSISTOR, WHEREBY THE BIAS ON SAID BASE DIFFERS FROM THE BIAS ON SAID EMITTER BY THE FORWARD VOLTAGE DROP OF SAID TRANSISTOR, AND MEANS APPLYING A SIGNAL VOLTAGE ACROSS THE LAST SAID RESISTANCE, SAID TRASISTOR HAVING MATERIAL POLARITY SUCH THAT FOR ZERO VALUE OF SAID SIGNAL VOLTAGE, THE SAID FORWARD VOLTAGE DROP BIASES SAID TRANSISTOR INTO CONDUCTION, WHEREBY FOR A GIVEN SIGNAL VOLTAGE RANGE INCLUDING BOTH POSITIVE AND NEGATIVE VALUES, THE CURRENT THROUGH SAID LOAD RESISTOR HAS A CORRESPONDING RANGE OF VALUES BUT DOES NOT CHANGE ITS SENSE IN RESPONSE TO CHANGE IN SIGN OF SAID SIGNAL VOLTAGE.