1. The problem statement, all variables and given/known data I need to create a circuit that will take in a Vin, and then for a Vin of less than or equal to 1V, or a Vin greater than or equal to 2V, an led will light up. For this I can only use one power supply of +-5V, and the circuit cannot draw more than 50mA. 2. Relevant equations Basically, its Vin goes to the Circuit which goes to the led 3. The attempt at a solution I'm having a hard time imagining this, but I was thinking that this will probably require an op-amp where the power supply is connected to it at +5V on one terminal and -5V on the other. Then I would need this opamp for the Vin, to output a negative value if Vin is between 1V and 2V; and positive otherwise. However, I am not sure how to do that. any help would be appreciated.