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hayniesk

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**Circuit Design -- Comparators to light an LED**

## Homework Statement

I need help designing a circuit that takes an input voltage and then lights a single LED if and only if V in is greater than or equal to 2V and less than or equal to 1 V.

It can only use 1 Power Supply unit, +/-5V

Circuit must not draw more than 50mA

## Homework Equations

voltage divider = v

_{total}*R

_{1}/(R

_{1}+R

_{2})

## The Attempt at a Solution

I know that there definitely needs to be a voltage divider of some sort (potentiometer?) range the voltage between 0V and 5V, and I probably will need 2 op amps. But I don't know how to design the circuit such that the LED will only light up if the voltage is within the given range.

Help appreciated!