555 Voltage monitor circuit

Published:2011/8/4 21:56:00 Author:Ecco | Keyword: 555 , Voltage , monitor | From:SeekIC

As shown in figure 10-26, the monitoring circuit is an one-shot trigger circuit which is composed of 555 and R1, C1, RP1, DW. Icon monitoring voltage is +5 V, when the input voltage of pin 2 of 555is normal, pin 3 of 555 is in low level, LED1 (green) is lit; if the input voltage is below the seting threshold level, 555 sets, pin 3 is in high level, LED1 is off, LED2 (red) is lit. If the monitor voltageis lower than normal value for a long time, 555 monostable circuit can be continuously re-trigger, that means it will start again after trigger temporary steady state td = 1.1R1C1. Temporary stabilization time of the icon parameter is about 1.7 seconds.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/555_Circuit/555_Voltage_monitor_circuit.html

Print this Page | Comments | Reading(3)