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Fault finding in complicated mains wirings often becomes a hard nut to crack for every electrician involved in the business. The simple circuit idea presented here can surely help them to get rid of headaches accompanied during such tedious assignments. Introduction The simple non-contact AC voltage detector, sensor, tester circuit design presented in this article will be especially useful to all those electrical engineers and electricians who are engaged in difficult electrical circuit designing, repairing and fault finding jobs. A fault inside any AC electrical system is basically caused through a break in the continuity of specific wires and may result in a major breakdown of the whole system. These breaks in the wires are generally caused by aging, short circuits, or in some places rats could be the main cause of these malfunctions. Our domestic AC mains (house wiring) voltage is made up of alternating currents that keep shifting phase from positive half cycle to negative half cycl...