Help pleas electrical circuit (low-pass filter)design its urgent?

First, you can determine the gain of the op amp and the filter characteristics based on the data points. 1. The low frequency gain is x10 3.

The -3db point is 2kHz = fc 4-5: The gain drops by 1/10 for each decade (10-fold increase) in frequency (aka 20 db per decade), so this is a 1st order lpf. A quick google of "first order low pass filter with op amp" leads to this circuit: http://freecircuitdiagram.com/2008/10/16... - There you go!

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