Post Undeleted by markt
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I was about to change that to something that would actually work, but it would just end up being pretty much the wheatstone bridge suggested by Andy

schematic

simulate this circuit – Schematic created using CircuitLab

Try this.

I was about to change that to something that would actually work, but it would just end up being pretty much the wheatstone bridge suggested by Andy.

schematic

simulate this circuit – Schematic created using CircuitLab

Try this.

    Post Deleted by markt
2 deleted 206 characters in body
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If you add a large resistor in parallel with the load (say, 10Mohm), then there will always be a small current through the sense resistor so there will always be a small difference in the comparator inputs. You might needI was about to tune either or both of the resistorschange that to suit the input requirements of the comparator; 10Mohm issomething that would actually work, but it would just aend up being pretty much the wheatstone bridge suggested starting pointby Andy.

If you add a large resistor in parallel with the load (say, 10Mohm), then there will always be a small current through the sense resistor so there will always be a small difference in the comparator inputs. You might need to tune either or both of the resistors to suit the input requirements of the comparator; 10Mohm is just a suggested starting point.

I was about to change that to something that would actually work, but it would just end up being pretty much the wheatstone bridge suggested by Andy.

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If you add a large resistor in parallel with the load (say, 10Mohm), then there will always be a small current through the sense resistor so there will always be a small difference in the comparator inputs. You might need to tune either or both of the resistors to suit the input requirements of the comparator; 10Mohm is just a suggested starting point.