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Lamp broken wire detection circuit diagram

2016-08-05 03:26  
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Lamp broken wire detection circuit diagram
The lamp broken wire detection circuit is shown in the figure. The circuit internal has comparison amplifier IC1, it is a special integrated circuit for detecting broken wire, C point has reference voltage. In normal condition, current tests resistance R, this current should be larger than reference current, A point voltage is lower than reference voltage, the output of comparison amplifier IC1 is 0, transistor T cuts off, the alarm lamp is off. When it is failure, the current on resistance R1 reduces, A point level rises and even higher than reference voltage, then the output of comparison amplifier IC1 is 1, the base of transistor T has current, T1 turns on, alarm lamp lights, it shows the circuit is failure.