I would like to present the voltage comparator circuit ,you can bring this circuit to apply with your project that concern in voltage checking or comparison.
This circuit provides an indication if has the input voltage differs from the two defined limits, V1 and V2 voltage source. We can adjustable limit and made to trigger from the adjustable “window”.
As to the amplifiers to the CA3140 MOSFET is used in circuit. They are used to benefit, as they have very little influence and can counteract the tension for change near 0 volts.
If a second operational amplifier is used as LF351 and CA741, will require a zero transverse force control.
This is only a predetermined 10k contact between pins 1 and 5, the wiper connected to the negative supply voltage and the pin of the fourth operational amplifier With this circuit, both operational amplifier, the LED when the input voltage out of range, 1N4148 diodes both “Y” to the exit door. The input voltage to be monitored is supplied through a 10K series resistor to the inputs of the two amplifiers operational amplifiers. If the input voltage exceeds the threshold value V1 and CA3140, the output voltage swing almost completely and turn off the LED. Similarly, if the input voltage is lower than the limit defined by V 2, then this is the operational amplifier moves to the Vcc and light the LED.
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