Recording circuit for use in facsimile receiving equipment

Claim 1

A RECORDING CIRCUIT FOR USE IN FACSIMILE RECEIVING EQUIPMENT COMPRISING FIRST MEANS HAVING FIRST AND SECOND OUTPUT TERMINALS FOR RECEIVING FACSIMILE SIGNALS; SECOND MEANS HAVING FIRST AND SECOND INPUTS CONNECTED TO SAID FIRST AND SECOND OUTPUT TERMINALS FOR BEING SELECTIVELY TURNED ON BY SAID FACSIMILE SIGNALS; THE FIRST AND SECOND OUTPUTS OF SAID SECOND MEANS HAVING TO A FIRST COMMON TERMINALS OF AN OUTPUT BRANCH; AN ELECTROLYTIV RECORDING MEDIUM CONNECTED IN SERIES WITH SAID OUTPUT BRANCH; SAID FIRST MEANS COMPRISING A TRANSFORMER HAVING AN INPUT WINDING FOR RECEIVING FACSIMILE SIGNALS AND HAVING THE TERMINALS OF ITS OUTPUT WINDING CONNECTED RESPECTIVELY TO SAID FIRST AND SECOND INPUTS; SAID SECOND MEANS COMPRISING A PUSH-PULL CIRCUIT INCLUDING FIRST AND SECOND CONTROL ELECTRODES CONNECTED TO THE TERMINALS OF SAID OUTPUT WINDING; SAID PUSH-PULL CIRCUIT INCLUDING FIRST AND SECOND TRANSISTORS; THE EMITER TERMINALS OF SAID TRANSISTORS BEING CONNECTED TO A SECOND COMMON TERMINAL OF SAID OUTPUT BRANCH; THE BASE ELECTRODES BEING CONNECTED TO THE TERMINALS OF SAID OUTPUT WINDING; THE COLLECTOR ELECTRODES OF SAID TRANSISTORS BEING CONNECTED TO SAID FIRST COMMON TERMINAL; SAID OUTPUT BRANCH COMPRISING A SERIES CIRCUIT BEING CONNECTED BETWEEN SAID FIRST AND SECOND COMMON TERMINALS COMPRISING A D.C. VOLTAGE SOURCE IN SERIES WITH SAID ELECTROLYTIC RECORDING MEDIUM; A NEGATIVE FEEDBACK ELEMENT CONNECTED IN SAID SERIES CIRCUIT; ONE TERMINAL OF SAID ELEMENT BEING CONNECTED TO SAID ELECTROLYTIC RECORDING MEDIUM AND THE OTHER TERMINAL BEING CONNECTED TO SAID SECOND COMMON TERMINAL; A SECOND D.C. VOLTAGE SOURCE HAVING A FIRST TERMINAL CONNECTED TO SAID OUTPUT WINDING INTERMEDIATE THE END TERMINALS THEREOF AND HAVING A SECOND TERMINAL CONNECTED TO THE SAID ONE TERMINAL OF SAID NEGATIVE FEEDBACK ELEMENT FOR BIASING SAID TRANSISTORS INTO CUTOFF IN THE ABSENCE OF FACSIMILE SIGNALS; SAID TRANSISTORS EACH BEING P-N-P ALLOY JUNCTION TRANSISTORS.