signal amplitude comparison circuit

Published:2011/9/14 19:49:00 Author:Nancy | Keyword: signal amplitude | From:SeekIC

The figure shown is computer power test circuit, which uses LM311 integrated voltage comparator.When the power supply voltage VCC is low, it can output alarm signal, which causes the computer to take immediate processing measure to protect the data. The reference voltage UR in the circuit is decided by the value of voltage-regulator diode VD1, and can choose different voltage values according to the need. The input voltage Ui of the comparator is decided by the voltage division of R2, R3 and RP1, which is proportional to the Vcc supply voltage Vcc. The main function of feedback resistance Rf is to accelerate the overturn of the comparator and reduce the transit time of the overturn.



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