Half-cycle ringing circuit

Claim 1

AN ELECTRONIC APPARATUS FOR DRIVING WITH RETURN-TOZERO PULSES AN ACOUSTIC DELAY LINE TRANSDUCER HAVING SHUT CAPACITANCE, SAID APPARATUS COMPRISING IN COMBINATION: AN UNSATURATED UNIT TRANSISTOR SWITCHING AMPLIFIER NORMALLY BASE BIASED INTO CONDUCTION AND BEING ACTUATABLE TO A NON-CONDUCTION STATE BY APPLICATION OF ONE OF SAID PULSES TO SAID BASE; A RESONANT RINGING CIRCUIT INCLUDING SAID CAPACITANCE IN PARALLEL WITH A SERIES INDUCTOR AND RESISTOR, AND BEING CONNECTED BETWEEN A FIRST SOURCE OF POTENTIAL AND ONE OF THE COLLECTOR AND EMITTER TERMINALS OF SAID TRANSISTOR; SAID RESONANT CIRCUIT BEING ACTUABLE TO OSCILLATE BY THE CHANGE OF SAID AMPLIFIER FROM ITS CONDUCTIVE TO ITS NON-CONDUCTIVE STATE; A SECOND RESISTOR AND SECOND CAPACITOR IN SERIES FORMING AN INTEGRATING NETWORK, SAID SECOND RESISTOR BEING CONNECTED TO A SECOND SOURCE OF POTENTIAL AND SAID SECOND CAPACITOR BEING CONNECTED TO THE OTHER OF SAID COLLECTOR AND EMITTER TERMINALS; A DIODE FOR COUPLING SAID CIRCUIT AND SAID NETWORK, AND BEING CONNECTED BETWEEN SAID SECOND RESISTOR AND SECOND CAPACITANCE TO SAID ONE OF SAID OSCILLATOR AND EMITTER TERMINALS, THE VALVES OF SAID RESISTORS, CAPACITANCES, INDUCTOR AND POTENTIALS BEING SELECTED FOR FORWARD BIASING SAID DIODE DURING CONDUCTION OF SAID AMPLIFIER, FOR REVERSE BIASING SAID DIODE JUST AFTER SAID AMPLIFIER IS ACTUATED TO SAID NON-CONDUCTIVE STATE, AND FOR AGAIN FORWARD BIASING SAID DIODE JUST BEFORE THE END OF THE JUST HALF CYCLE OF SAID OSCILLATION OF SAID RESONANT CIRCUIT.