Published:2011/4/27 3:41:00 Author:Ecco | Keyword: 555, voltage detection | From:SeekIC
As shown in Figure 7-10, the voltage detection circuit uses 555 as the core to form in bistable mode. Usually, the pin 6 of 555 (threshold level side)is connected to VDD by R1, therefore, pin 3 is in low level. The pin 2 on trigger end of 555 is connected to the measured point by a regulator DW, DW regulator is Vz, when the measured voltage is less than Vz +1/3 VDD, the 555 sets, pin 3 is high level, LED is lit. If using different value of regulators DW, it is controlled by the switch, you can distinguish the different values of the measured voltage.
Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/555_Circuit/555_voltage_detection_circuit.html
Print this Page | Comments | Reading(3)
Code: