| 摘要 |
<p>PURPOSE:To prevent the state that a starter is not driven due to power voltage drop at cassette deck operation by providing a feeding circuit connecting power supply lines when the voltage of a battery is a predetermined value or more and opening the power supply lines when said voltage is low. CONSTITUTION:The feeding circuit 10 is provided between the battery 1 and one terminal of a power switch 6. The feeding circuit 10 is constituted that a contact of a relay 11 is connected between one terminal (in this case, + terminal) of the battery 1 and the power switch 6, a transistor (TR) 12 and a resistor R1 are connected to the coil of the relay 11 and a power voltage VB is divided by two resistors R2, R3 to use the result as a base voltage of the TR 12 thereby turning on/off the TR 12. In the feeding circuit 10, a reference value VC for deciding the voltage of the battery 1 is set as VC=VB-minVS (where; minVS is the minimum drive voltage of a starter 2) to prevent an event that the starter 2 cannot be driven due to the power voltage drop.</p> |
