| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply circuit for a vehicular meter, which protects even low rated components with respect to inrush current, by controlling the maximum current flowing into transistors or Zener diodes.SOLUTION: The power supply circuit for a vehicular meter includes a first transistor 4 connected to a vehicular power supply line and a load circuit 3; a Zener diode 5 connected to the first transistor 4; an electrolytic capacitor 6 connected to the wiring between the first transistor 4 and load circuit 3; a first current limiting resistor 7 connected to the wiring between the power supply line and first transistor 4; a second transistor 8, connected to the first current limiting resistor 7 and first transistor 4; a second current limiting resistor 9 connected to the base of the second transistor 8; and a voltage limiting diode 10 connected to the power supply line and second transistor 8. |
