Temperature compensated solid state differential amplifier

Claim 1

AN ALTERNATING CURRENT AMPLIFIER COMPRISING A PAIR OF INPUT TRANSISTORS HAVING THE BASE THEREOF SEPARATELY COUPLED TO A PAIR OF INPUT TERMINALS AND THE EMITTERS THEREOF COUPLED TO A COMMON TERMINAL FOR INPUT SIGNAL, A POTENTIOMETER CONNECTED BETWEEN COLLECTORS OF SAID INPUT TRANSISTORS AND TO POWER SUPPLY MEANS FOR ADJUSTABLE CANCELLATION OF UNWANTED INPUT SIGNALS A CONVERSATION TRANSISTOR, MEANS COUPLING THE COLLECTORS OF SAID INPUT TRANSISTORS BETWEEN THE BASE AND EMITTER OF SAID CONVERSATION TRANSISTOR WHEREBY THE OUTPUT OF SAID LATTER TRANSISTOR IS PROPORTIONAL ONLY TO VARIATIONS IN VOLTAGE BETWEEN SAID INPUT TERMINALS, AT LEAST AMPLIFYING TRANSISTOR HAVING THE BASE THEREOF COUPLED TO THE COLLECTOOR OF SAID CONVERSATION TRANSISTOR AND PRODUCING AN AMPLIFIED OUTPUT ACROSS A RESISTOR CONNECTED TO THE EMITTER THEREOF, AND A NEGATIVE FEEDBACK CIRCUIT INCLUDING A TRANSISTOR HAVING A BASE COUPLED TO THE COLLECTER OF SAID AMPLIFIER TRANSISTOR AND THE COLLECTOR AND EMMITTER CONNECTED ACROSS THE BASE AND EMITTER ON ONE OF SAID INPUT TRANSISTORS WITH BYPASS CAPACITOR IN THE BASE CIRCUIT OF SAID FEEDBACK TRANSISTOR, WHEREBY ONLY DIRECT CURRENT AMPLIFIER OUTPUT SIGNALS ARE FED BACK TO PROVIDE TEMPERATURE STABILIZATION OF THE CIRCUIT.