| 摘要 |
PURPOSE:To cut off useless power consumption and to extend the battery life by supplying the power to the recorder only for the time from the releasing to the end of recording. CONSTITUTION:When a transistor 4 is made on by positive release pulses, the base current of a transistor 1 flows via a resistor 3 and the transistor is activated. A power supply 2 supplies a recorder 11 and a D-type flip-flop 8. When the recording is completed, the recorder 11 generates pulses to reset the D-type flip-flop 8, therefore the Q-terminal returns to a level L0. Because the Q-terminal of the flip-flop is at level L0, a transistor 5 becomes off and the base current of the transistor 1 is cut off and it becomes off to stop the power supply to the recorder 11.
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