| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery check circuit simple and uncomplicated using a less number of parts at a low cost. SOLUTION: The battery check circuit 2 comprises a first resistor R1 and a second resistor R2 connected in parallel to the anode of a thyrister SCR1 and a differential circuit 3 connected to the gate of the thyrister SCR1 for applying voltage to the gate, wherein a b-contact 4b of a switch 4 is provided for making/breaking a circuit for one resistor and an a-contact 4a is provided in association with the b-contact 4b of the switch 4 for making/breaking the differential circuit 3 and a light emitting diode LED1 is provided to be lit with the conduction of the thyrister SCR1. |
