Abstract: A drive circuit for light-emitting diode (LED) lighting apparatus is disclosed. The power circuit that drives multiple interconnected light-emitting diode basically is a switching power supply and comprises a pulse width control IC, a pulse transformer and an output conversion circuit. The drive circuit provides the operating voltage for multiple light-emitting diodes. The pulse width control IC takes the output current from the output conversion circuit as feedback control signal, such that when the output current from the output conversion circuit increases, the pulse width control IC corrects the pulse width on the output to cause a decrease in voltage output to control the current output and to extend the service life of light-emitting diode.

Abstract: An LED decorative light bulb and its manufacturing method are disclosed. The LED decorative light bulb has a frame with a negative pole and a positive pole separate from each other. After first copperplating, first nickeling, second copperplating, and second nickeling processes, a crystalplate is melted on the top of the negative pole and a lead extending therefrom is molten on the positive pole. The frame is then covered by epoxy resin and the Decorative light bulb is formed. The LED decorative light bulb is able to be installed in a conventional base which is then fitted in a conventional bulbholder. The crystalplate is higher than the upper edge of the base so that its light is not obscured by the upper edge.