Gain-controlled transistor amplifier

Claim 1

A CIRCUIT ARRANGEMENT FOR VARYING THE AMPLITUDE OF A SIGNAL APPLIED OVER A FIRST PATH WITH FULL AMPLITUDE AND OVER A SECOND PATH WITH REDUCED AMPLITUDE COMPRISING, IN COMBINATION, A VOLTAGE DIVIDER HAVING TWO ENDS AND A TAPPING POINT AND COMPRISING A FIRST RESISTOR CONNECTED VIA SAID TAPPING POINT TO A VOLTAGE-DEPENDENT SECOND RESISTOR; A TRANSISTOR HAVING EMITTER, COLLECTOR AND BASE ELECTRODES; A DIRECT VOLTAGE SOURCE HAVING TWO POLES FOR PROVIDING A DIRECT VOLTAGE; MEANS FOR APPLYING THE DIRECT VOLTAGE FROM SAID VOLTAGE SOURCE TO SAID VOLTAGE-DEPENDENT SECOND RESISTOR; MEANS FOR VARYING THE VOLTAGE APPLIED TO SAID SECOND RESISTOR; A LOAD RESISTOR; AN EMITTER RESISTOR; CONNECTION MEANS CONNECTING THE TAPPING POINT OF SAID VOLTAGE DIVIDER TO THE BASE OF SAID TRANSISTOR; CONNECTION MEANS CONNECTING SAID SIGNAL VIA A FIRST PATH TO ONE END OF SAID VOLTAGE DIVIDER; CONNECTION MEANS CONNECTING THE OTHER END OF SAID VOLTAGE DIVIDER TO ONE OF THE POLES OF SAID DIRECT VOLTAGE SOURCE; CONNECTION MEANS CONNECTING THE COLLECTOR SAID TRANSISTOR TO A POLE OF SAID DIRECT VOLTAGE SOURCE VIA SAID LOAD RESISTOR; CONNECTING MEANS CONNECTING THE EMITTER OF SAID TRANSISTOR TO ANOTHER POLE OF SAID DIRECT VOLTAGE SOURCE VIA SAID EMITTER RESISTOR; AND CONNECTION MEANS CONNECTING SAID SIGNAL VIA A SECOND PATH TO SAID EMITTER OF THE TRANSISTOR.