Hi, I am using a potentiometer to modify a control voltage for an oscillator. I have a target voltage that creates a desired frequency, say 4.6V. I want to have an LED that turns on when the voltage is around the target voltage. My first naive idea was to just hook the LED from the control voltage to ground, but that drastically lowers the pitch since the voltage gets used to light the led. I assume I need some IC that could compare that voltage to a reference voltage without modifying the original voltage, could someone suggest one? I am using a single 6V supply.