dandedandelion
New Member
I am having difficulties with solving question number 2.
Below is the circuit that was provided in the mark scheme.
I am having a hard time understanding the circuit.
1. I believe R_s is the sensor, i.e. the potmeter described in question 1, am I right? In that case, why would we place it here?
2. Why do we have a voltage divider at the beginning of the circuit. And why is the input to the inverting amplifier set to -1.0V? Is the potmeter on the far left just used for tuning?
3. Why do we have an inverting amplifier and a differential amplifier RIGHT AFTER? I don't understand why we would want that as their use is very similar. (Is it just to multiply by -1? (Don't know if this makes sense...))
Is this the easiest solution? Wouldn't it be easier to just measure the voltage over the wire-wound pot and then fix the range?
How should one think when approached with a question like this?
All help is very much appreciated!