| 摘要 |
PURPOSE:To make the changeover of polarity possible by one power supply though two power supplies have been required in an electric power device used for various electronic equipments. CONSTITUTION:An output obtained by converting an AC power supply 1 into DCs by a rectifier circuit is voltage-divided by resistors 5, 6 and output while one of the rectifier cirucit is connected to a ground through a switching element 8 and connected to the ground through the resistor 7 of the other. |
