OPERATING PREVENTION CIRCUIT AT 110V INPUT IN 220V TYPE VCR

摘要

a noise elimination unit(1) eliminating noise of the input power; rectifiers(2, 4) rectifying the power; a switching unit(8) connected between rectifiers to change the power to pulse; a 110V/220V discriminating circuit generating the corresponding level by checking if the input power is 110V or 220V, and connected to one side tap of the second rectifier; a switch device turned on/off according to the output of 110V/220V discriminating circuit; and a timer microcomputer(7) controlling the VCR according to the on/off state of the switching device.