Mattylad
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in which polarity?HI, many thanks for the suggestions.
What I have forgotten is to say that the rest of the tester is running at 24v DC, using 24v LED's.
There is 24v fed to one leg of the resistor as that goes into a connector, the other leg is wired back to another connector
so I can measure across both legs but will have to handle 24v on the input.
Agreed. At first I thought the bottom resistor should serve as a 390 ohm 'reference' equal in value to the target resistance.390 to 24V will likely fry both 1/4 W resistor instantly as each draws 3/8th W
The 555 does it all. The external resistors using the control R makes this solution easy. The cap makes the 3rd condition to capture all 3 states , matched , open short.Agreed. At first I thought the bottom resistor should serve as a 390 ohm 'reference' equal in value to the target resistance.
However the bottom resistor can be a higher value, thus getting by with lesser Amperes. Then all we need to do is apply new upper and lower volt levels to the comparator window.
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