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I have an 3 wire Eaton iProx sensor that detects metal. Since it needs 6-48v to operate I am using a 9v battery to power it. Whenever it detects metal it outputs the input voltage through the signal wire. I am using a 7805 voltage regulator to bring it down to 5v so I can plug that into my Arduino. Would it be better to use a transistor instead since the Arduino and the sensor are both using different power sources? I have a schematic for it below I don't know if I drew it properly though.


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I think it would be easier to just use a resistor and zener diode combination, like this:

http://ruggedcircuits.com/html/circuit__27.html

Do not enable the pullup resistor though.

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Where could I get one of those from? 
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This should work:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=1N5230B-TPCT-ND

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Thanks for the help!
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