| 摘要 |
PURPOSE:To reduce the heat generation of limited resistor and prevent the luminous diode from miss-operation by a method wherein a coil and a lamp are arranged on a relay in series, and a limited resistor is provided only on the lamp in parallel. CONSTITUTION:A luminous diode 10 is arranged on a relay 8 in series. A limited resistor 15 is arranged on a luminous diode 10 in parallel. The resistance value of the limited resistor 15 is set at 10mm.A which is obtained by subtracting the electric current 20mm.A of the luminous diode 10 from the coil electric current 30mm.A of the relay 8. When a transistor 9 is made ON, the relay 8 is made ON, then the luminous diode 10 is lighted. The coil electric current of the relay 8 is also flowed distributively through the resistor 15, accordingly, the supplied electric current for the luminous diode 10 is made constant, the damage of the luminous diode 10 can be prevented. Thereby, the miss-operation of the luminous diode can be prevented. |
