I have a signal output whose voltage ranges from 120uv to 15mv ...i need to set a reference point in between those voltages- (v) and V must be as closer to 120uv for minimizing error. the condition is i want to glow a led when voltage output is >V(ref voltage) and led in off state when voltage output < V.
to do so i thought of amplifying the signal to range of volts and then use a comparator to make the led on and off for those ranges. But it seems that the ompamp i was using ic-741 had an offset voltage of 10mv.. due to which the voltage output from the amplifier circuit saturated to Vcc(sat).
to do so i thought of amplifying the signal to range of volts and then use a comparator to make the led on and off for those ranges. But it seems that the ompamp i was using ic-741 had an offset voltage of 10mv.. due to which the voltage output from the amplifier circuit saturated to Vcc(sat).