amplification of output of linear potentiometer

[anju420]

How do I amplify and digitize the output of a 10k,100mm,0.5W linear potentiometer? any available circuits? do i simply use an instrumentation amplifier and ADC...and interface it directly to my FPGA?

 

[keith1200rs]

If all you want is the position for your FPGA then you don't need to amplify anything. Connect the ends of the pot to ground and the positive supply and the wiper to the ADC input.

Keith

 

[anju420]

well...yes, my aim is to trace out the position of a piston/plunger...can i connect a linear pot of any rating thru the ADC to my FPGA?...any design considerations i need to look into to select my ADC?

 

[keith1200rs]

Yes that should be fine with any pot and ADC. You may need to add a capacitor to ground of the pot wiper - ADCs often don't like high driving resistances. Make sure the ADC can handle the input range (although you could easily add fixed resistors to the pot to reduce it's range).

Keith

 

[anju420]

thank u