Some potentiometers are multi-turn... Some potentiometers arc multi-tum. in othe

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Some potentiometers are multi-turn...

Some potentiometers arc multi-tum. in other words, the resistance varies linearly with angle from near 0 to maximal resistance over multiple revolutions Say you are using a 10 Ul, 2 turn potentiometer to measure the position of the "elbow" joint of a robotic arm by directly coupling the wiper to the joint of the arm (i.e., one revolution of the joint equals one revolution of the potentiometer). You need to measure the joint angle over a 90 degree range and should use the middle of the range of the potentiometer, such that 45 degree corresponds to one revolution of the potentiometer (Rwiper = S kOhm) Design the circuit with this potentiometer to have an output voltage of -5 V to 5 V with 0 V corresponding to 45 degree. You have at your disposal tl5V voltage sources and any op-amps (with plusminus 15 V supplies) and resistors that you might need (Hint after you've set up your potentiometer circuit, what mathematical operations) do you need to get the output range to equal to [-5,+5V]) Why might a 1-turn, 10 k Ohm potentiometer be better suited for this application?

Explanation / Answer

b) Because Joint rotation will be of One revolution only Using multiple turn Potentiometer makes no sense as the other turns are wasted.

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