1. The problem statement, all variables and given/known data Construct a circuit that turns on if it the voltage provided is greater than 3 volts, or less than 2. MUST USE THESE CRITERIA: i<100mA, only one PS. Fewer than ten components. 2. Relevant equations None that I know of, but we've covered resistors, caps, inductors, and op amps thus far. 3. The attempt at a solution I'm pretty lost on this one. We've studied op amps, so I would know how to do this if this involved having one voltage source be greater than another, that is, using a comparator. Where I'm unsure is where you compare Vin to two different voltages. The problem description depicts 2V, 3V, and Vin going into an undefined element (our circuit) and then out to an LED. Unsure if this means that the 2V and 3V are PS's. Sorry for the vagueness on this one. I'm also kind of unsure, since the problem is poorly worded.