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How is this tester made?

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mahsun494

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



 
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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