The utility model discloses a circuit is got to single live wire, including start?power, start?power and drive circuit and three terminal regulator are connected, and three terminal regulator and impulse generator are connected, and impulse generator is connected with the switch tube that steps up, and the switch tube that steps up is connected with step up transformer, drive circuit with get electric field effect transistor and be connected, get electric field effect transistor and be connected with step up transformer, step up transformer and three terminal regulator are connected. The utility model discloses an electricity is realized getting by field effect transistor voltage drop and step up transformer circuit, solves the problem that the electric work consumes greatly and output voltage reduces of getting.