Multivibrator circuit employing transistors of complementary types

Claim 1

A MULTIVIBRATOR COMPRISING A PNP TRANSISTOR AND AN NPN TRANSISTOR EACH HAVING EMITTER, BASE AND COLLECTOR; THE MULTIVIBRATOR BEING IN A FIRST OPERATING STATE WHEN BOTH OF SAID TRANSISTORS ARE IN THE LOW CONDUCTION CONDITION AND BEING IN A SECOND OPERATING STATE WHEN BOTH OF SAID TRANSISTORS ARE IN THE HIGH CONDUCTION CONDITION; A SOURCE OF SUBSTANTIALLY CONSTANT DIRECT-CURRENT POTENTIAL; CONDUCTIVE MEANS CONNECTING THE EMITTER OF THE PNP TRANSISTOR DIRECTLY TO THE POSITIVE TERMINAL OF SAID SOURCE; RESISTANCE MEANS CONNECTING THE COLLECTOR OF THE NPN TRANSISTOR TO THE POSITIVE TERMINAL OF SAID SOURCE; CONDUCTIVE MEANS CONNECTING THE EMITTER OF THE NPN TRANSISTOR DIRECTLY TO THE NEGATIVE TERMINAL OF SAID SOURCE; RESISTANCE MEANS CONNECTING THE COLLECTOR OF THE PNP TRANSISTOR TO THE NEGATIVE TERMINAL OF SAID SOURCE; MEANS CONNECTING THE BASE OF EACH TRANSISTOR TO THE COLLECTOR OF THE OTHER; MEANS FOR ALTERING THE BIAS ON THE BASE OF AT LEAST ONE OF THE TRANSISTORS TO INCREASE CONDUCTION THROUGH THE TRANSISTOR AND TRIGGER THE MULTIVIBRATOR FROM THE FIRST OPERATING STATE TO THE SECOND OPERATING STATE; MEANS FOR ALTERING THE BIAS ON THE BASE OF AT LEAST ONE OF THE TRANSISTORS TO DECREASE CONDUCTION THROUGH THE TRANSISTOR AND TRIGGER THE MULTIVIBRATOR FROM THE SECOND OPERATING STATE TO THE FIRST OPERATING STATE; AND MEANS FOR DERIVING AN OUTPUT SIGNAL FROM THE COLLECTOR OF AT LEAST ONE OF THE TRANSISTORS.