| 摘要 |
A rechargeable/portable multi-voltage DC power supply includes an Ni-Cd rechargeable battery set (80) connected to a switching power supply converting circuit (40), a pulse width modulation circuit (50), and a filter circuit (60) for providing a regulated output voltage from the filter circuit (60). A button switch (14) cooperates with a selection circuit (10) and a feedback ratio circuit (20) for selecting a specific output voltage from a plurality of available output voltages. A plurality of light emitting diodes (30) are connected to the selection circuit (10) for indicating the value of the output voltage. <IMAGE> |
