Alternating current voltage sensor

Claim 1

TRIGGER APPARATUS FOR ENERGIZING A LOAD IMPEDANCE FROM A POWER SOURCE IN RESPONSE TO THE ACHIEVEMENT OF A THRESHOLD VOLTAGE BY AN ALTERNATING INPUT SIGNAL FROM A SIGNAL SOURCE WHICH COMPRISES, A FIRST AND A SECOND INPUT TERMINAL ADAPTED FOR CONNECTION TO SAID SIGNAL SOURCE, A DIRECT CURRENT RELAY A CONTROL ELECTRODE, SAID RELAY TROLLABLE RECTIFIER HAVING A CONTROL ELECTRODE, SAID RELAY WINDING AND SAID RECTIFIER BEING CONNECTED IN SERIES ACROSS SAID TERMINALS FOR OPERATING SAID RELAY UPON CONDUCTION BY SAID RECTIFIER, A UNIJUNCTION TRANSISTOR HAVING FIRST AND SECOND CONDUCTION, BASE ELECTRODES CONNECTED ACROSS SAID TERMINALS AND A CONTROL, EMITTER ELECTRODE, A FIXED RESISTOR, A CAPACITOR, AND A VARIABLE RESISTOR CONNECTED IN SERIES ACROSS SAID TERMINALS , MEANS CONNECTING A TERMINAL INTERMEDIATE SAID CAPACITOR AND SAID VARIABLE RESISTOR IN SERIES WITH SAID UNIJUNCTION TRANSISTOR EMITTER ELECTRODE, SAID FIRST BASE ELECTRODE AND SAID FIXED RESISTOR FOR DISCHARGING SAID CAPACITOR UPON CONDUCTION FROM SAID EMITTER ELECTRODE THROUGH SAID FIRST BASE ELECTRODE, THEREBY TO DISCHARGE SAID CAPACITOR THROUGH SAID FIXED RESISTOR TO DEVELOP A DISCHARGE OPERATING SIGNAL ON THE COMMON RESISTOR AND MEANS FOR COUPLING SAID COMMON TERMINAL TO SAID RECTIFIER CONTROL ELECTRODE