| 摘要 |
<p>PURPOSE:To extend the service life of a battery by providing a start circuit turning on the 2nd switch means for a prescribed period only at the start of a power supply circuit. CONSTITUTION:A transistor (TR) sending power fed from a battery 1 an output terminal, the 1st 2nd switch means 7, 9 connected in parallel, a stabilizing circuit 10 supplying a base current to the TR via the two switch means, a start circuit 22 and a logic circuit 15 are provided. Then the start circuit 22 turns on the 2nd switch means 9 for a prescribed period only at the start of a power supply circuit and the logic circuit 15 inputs an automatic power-off signal and a reset signal and turns on the 1st switch means 5 only when two signals are both false.</p> |
