İ do have a led psu so no problem with using 12 volts but how do i use it on encoder i dont think i can do it simply without voltage divider or else i need some guidance please
Correct you can't do it without a voltage divider unless you want to use an optical isolator which is more expensive and still requires two resistors as well.
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If the encoder has open collector or open drain A/B outputs, then a direct connection is possible.
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Hi, @ozanshllglr
Welcome to the forum.
Can you post a link to data/specs of your encoder please?
As @jremington has pointed out, some sensors have "Open Collector/Drain" outputs to enable a different output signal voltage than the sensors supply voltage.
Tom... 
E50S8-360-3-T-24 here is my encoders spesifications
Input voltage - #7 by bigred1212 what about this idea? Can i do that with my arduino leonardo and 12v 1A dapter
You have the E50S8-360-3-T-24 with "totem pole" output, which outputs the supply voltage.
If you had instead ordered E50S8-360-3-N-24 you could connect it directly to the Arduino
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Didnt ordered found it from a friend 
See post #2.
İ guess im bad at forum thing i didnt get #2
Your last post is post #10. Scroll up to post #2.
Okay so i need to buy another encoder
Or use a voltage divider or optocoupler, saving around $185.
Good luck with your project!
İ really not good at these things doing it for my son can you give me a circuit for voltage divider
Why not a simple diode (cathode to the encoder, anode to the Arduino) and the Arduino pullup resistor ?
So the vin is my 12v psu s v+ side and the gnd is v- side of the psu
Yes that is it.
You also need to connect the ground of the Arduino to the V- side of the PSU.
Thanks man
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