| 摘要 |
<p>PROBLEM TO BE SOLVED: To monitor the connection failure of a cable. SOLUTION: This circuit is provided with resistors R1 and R4, with which one terminal is connected to a power source, switch SW1, with which one terminal is grounded and the other terminal is connected to the other terminal of the resistor R1, the cathode of a regulated voltage diode Z1 and one terminal of a resistor R3, transistor Q1, a base of which is connected to the anode of the regulated voltage diode Z1, an emitter is grounded and a collector is connected to one terminal of a resistor R2, light emitting diode D1. With which an anode is connected to the other terminal of the resistor R4, transistor Q2, with which a base is connected to the other terminal of the resistor R2, an emitter is connected to the cathode of the light emitting diode D1 and a collector is connected to the first pin of a connector 50, transistor Q3, with which a base is connected to the other terminal of the resistor R3, an emitter is connected to the first pin of the connector 50 and a collector is connected to one terminal of a resistor R5, and light emitting diode D1, with which an anode is connected to the other terminal of the resistor R5 and a cathode is grounded.</p> |
