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How is this tester made?

mahsun494

New Member
hello, how to make the device in the video. camshaft, crank, abs sensor tester, I wonder how is the circuit diagram of it.



 

rjenkinsgb

Well-Known Member
Most Helpful Member
I'd guess it's just a simple voltage comparator that triggers the sounder & LED if the input exceeds eg. 200mV or so, plus a high value pull-up resistor so the sounder is triggered if the sensor is open circuit, or not connected.
 

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