[Maxbotix]

Needlerp,

The analog voltage output from the MaxSonar product line is best suited for input into a high impedance amplifier or an AD converter. An op-amp, when connected as a non-inverting amplifier will have a high impedance input for the sensor to drive.

Alternatively, if you prefer an inverting amplifier, use 100K in the first stage (i.e. the resistor leading from our sensor to the op-amp) and 500K in the feedback from (the op-amp output to the input) should do the trick just fine.

If you have any further questions, please let me know (or post here and I will check back)

Carl Myhre, Systems Engineer, Carl @ Maxbotix."com" (remove spaces and quotes)