| 摘要 |
<p>PURPOSE:To prevent batteries from being consumed wastefully when not turned off by mistake, by operating a transistor (TR) switch through a play switch which serves as a nonlock type power switch, and thus turning on and off the power source of a motor and an amplifier. CONSTITUTION:When a power and play switch 10 is turned on, the capacitor C2 of a control power source holding circuit 11 is charged and a voltage is applied to a terminal 1 of an FF14 with delay 15, obtaining a high level at a terminal 5 of the FF14. A terminal (3) of the FF14 is held at the high level and a TRTR2 turns on to turn a Tr1 on, supplying currents to a motor 13 and an amplifier 12. Then when an optional stop switch 16 or an automatic stop switch 17 is turned on, the terminal (5) of the FF is held at a low level, and a terminal (6) is held at the high level; and a terminal 2 is held at the high level, and a terminal (3) is held at the low level to turn off both the Tr2 and Tr2, powering down the motor 13 and amplifier 12. Consequently, the power switch is prevented from being left turned on by mistake and the constitution is reduced in size by a nonlock type electronic switch.</p> |
