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2 votes
4 answers
3k views

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-...
Alison's user avatar
  • 357
3 votes
0 answers
146 views

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 ...
Idix's user avatar
  • 51
2 votes
2 answers
412 views

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 ...
bradfier's user avatar
1 vote
1 answer
323 views

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 ...
Duncan F's user avatar
1 vote
1 answer
518 views

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-...
Diana 's user avatar
  • 33