Direct current amplifier of the type comprising two cascaded transistors in series with a third transistor

Claim 1

IN A DIRECT CURRENT AMPLIFIER, THE COMBINATION OF: A FIRST TRANSISTOR OF ONE CONDUCTIVITY TYPE; A SECOND TRANSISTOR OF THE COMPLEMENTARY CONDUCTIVITY TYPE; A THIRD TRANSISTOR OF THE SAME CONDUCTIVITY TYPE AS THE SECOND; EACH OF SAID TRANSISTORS HAVING A BASE AND AN EMITTER AND A COLLECTOR; CONDUCTIVE CONNECTIONS BETWEEN THE COLLECTOR OF THE FIRST TRANSISTOR AND THE EMITTER OF THE SECOND TRANSISTOR AND THE COLLECTOR OF THE THIRD TRANSISTOR, WHEREBY THE ELECTRICAL PATH DEFINED BY THE EMITTER AND COLLECTOR OF THE FIRST TRANSISTOR AND THE ELECTRICAL PATH DEFINED BY THE COLLECTOR AND EMITTER OF THE SECOND TRANSISTOR ARE IN SERIES WITH THE ELECTRICAL PATH DEFINED BY THE COLLECTOR AND EMITTER OF THE THIRD TRANSISTOR, SO THAT THE FIRST AND THIRD TRANSISTORS ARE IN COMPLEMENTARY SYMMETRY; MEANS FOR PROVIDING ENERGY COMPRISING A POTENTIAL DIVIDER HAVING END TERMINALS OF OPPOSITE POLARITY AND A REFERENCE POTENTIAL TAP AND A FIRST INTERMEDIATE POTENTIAL TAP; FIRST AND SECOND RESISTORS CONNECTED BETWEEN THE BASES OF THE FIRST AND SECOND TRANSISTORS, RESPECTIVELY, AND SAID REFERENCE POTENTIAL TAP;