All Questions
Tagged with sensing operational-amplifier
5 questions
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4
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Op-amp use in voltage sensing
For voltage sensing, we use a resistor divider and then we always feed that value of the resistor divider to an op-amp and then the op-amp output is fed to a microcontroller.
What exactly does the op-...
3
votes
0
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How does this capacitance measurement op-amp circuit work?
I'm studying this scientific paper where a capacitance measurement is done with the circuit shown at page 3. For simplicity I reported it here:
A sinusoidal signal is applied at the input through a ...
2
votes
2
answers
412
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Controlling an output based on level of AC signal
This is my first post on this StackExchange after years of lurking, so please be gentle!
I would like to be able to enable an output (for example an LED) based upon an AC voltage from a split-core ...
1
vote
1
answer
323
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Positive and Negative Sense Circuit. How/why does this work?
I am trying to build a centre-off model railway controller, no reversing switch. I am working on the overload/short detection part of the circuit based on sensing the voltage across a 0R68 resistor. I ...
1
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1
answer
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how to design a differential op-amp for sensing a ac current?
I tried to design a simple electronic load, but I would like to amplify the the voltage across the sensing resistor with gain of 20. Then I can apply a sine wave reference to have a current between 0-...