Transistor amplifier circuits utilizing a zener diode for stabilization

Claim 1

A STABILIZED SIGNAL AMPLIFIER CIRCUIT COMPRISING IN COMBINATION, A FIRST TRANSISTOR INCLUDING BASE, EMITTER, AND COLLECTOR ELECTRODES, SIGNAL INPUT MEANS CONNECTED FOR APPLYING AN INPUT SIGNAL TO SAID BASE ELECTRODE, A SECOND TRANSISTOR INCLUDING BASE, EMITTER, AND COLLECTOR ELECTRODES, SIGNAL OUTPUT MEANS CONNECTED BETWEEN THE COLLECTOR AND THE EMITTER ELECTRODES OF SAID SECOND TRANSISTOR, MEANS PROVIDING CONNECTIONS FOR APPLYING BIASING POTENTIAL TO SAID TRANSISTORS, MEANS INCLUDING A ZENER DIODE DIRECT CURRENT CONDUCTIVELY CONNECTING THE COLLECTOR ELECTRODE OF SAID FIRST TRANSISTOR AND THE BASE ELECTRODE OF SAID SECOND TRANSISTOR TO PROVIDE VARIATION OF THE BASE VOLTAGE AND COLLECTOR CURRENT OF SAID SECOND TRANSISTOR IN RESPONSE TO COLLECTOR CURRENT VARIATION OF SAID FIRST TRANSISTOR, SAID ZENER DIODE BEING POLED FOR REVERSE CURRENT FLOW TO PROVIDE A SUBSTANTIALLY FIXED POTENTIAL DROP ACROSS SAID ZENER DIODE WHEN SAID TRANSISTORS ARE BIASED FOR SIGNAL AMPLIFICATION, AND MEANS PROVIDING A DIRECT CURRENT CONDUCTIVE CONNECTION BETWEEN THE COLLECTOR ELECTRODE OF SAID SECOND TRANSISTOR AND THE EMITTER ELECTRODE OF SAID FIRST TRANSISTOR TO PROVIDE VARIATION OF THE EMITTER VOLTAGE OF SAID FIRST TRANSISTOR IN RESPONSE TO COLLECTOR CURRENT VARIATION OF SAID SECOND TRANSISTOR TO STABILIZE THE OPERATION OF SAID AMPLIFIER CIRCUIT.