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hayniesk
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Circuit Design -- Comparators to light an LED
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
voltage divider = vtotal*R1/(R1+R2)
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!
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 = vtotal*R1/(R1+R2)
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!