Automatically keyed signal source

Claim 1

AN AUTOMATICALLY KEYED, SONIC-SIGNAL SOURCE COMPRISING, IN COMBINATION: A PAIR OF TRANSISTORS, EACH HAVING AT LEAST AN EMITTER, COLLECTOR AND BASE ELEMENT, SAID EMITTERS BEING CONNECTED TOGETHER; A MAGNETOSTRICTION TRANSDUCER CONNECTED BETWEEN THE COLLECTOR ELEMENTS OF SAID TRANSISTORS; CONNECTIONS FOR A SOURCE OF SUPPLY VOLTAGE FOR SAID TRANSISTORS, SAID CONNECTIONS BEING CONNECTED BETWEEN SAID MAGNETOSTRICTION TRANSDUCER AND THE EMITTERS OF SAID TRANSISTORS; A TRANSFORMER FOR PROVIDING SUFFICIENT POSITIVE FEEDBACK BETWEEN THE OUTPUT AND INPUT OF EACH TRANSISTOR TO CAUSE SAID TRANSISTORS TO OSCILLATE, THE PRIMARY WINDING OF SAID TRANSFORMER BEING CONNECTED BETWEEN THE COLLECTOR ELEMENTS, AND THE SECONDARY WINDING BETWEEN THE BASE ELEMENTS, OF SAID TRANSISTORS; A CAPACITANCE CON NECTED IN THE FEEDBACK PATH OF AT LEAST ONE TRANSISTOR, SAID CAPACITANCE BEING OF SUCH VALUE THAT THE FREQUENCY OF OSCILLATION OF SAID TRANSISTORS CORRESPONDS TO THE RESONANT FREQUENCY OF SAID MAGNETOSTRICTION TRANSDUCER; A BASE-BIASING RESISTANCE; AND A RELAXATION OSCILLATOR CONNECTED IN SERIES WITH SAID BASE-BIASING RESISTANCE BETWEEN THE EMITTERS AND THE BASES OF SAID TRANSISTORS FOR AUTOMATICALLY CUTTING OFF OSCILLATION OF SAID TRANSISTORS AT A PREDETERMINED RATE.