Making resonance using "simulated inductor" (op amp) I want to have a circuit that responds strongly (gives me a good measurable voltage) to a 10kHz sound input. To do this, I thought about hooking up a microphone and making a resonance circuit (using inductor and capacitor) to amplify the microphone output ONLY at 10kHz (simply hooking up the microphone to an op-amp did not work because of poor signal/noise ratio). The problem is, finding the right inductor is not easy, so I thought about using a "simulated" inductor: http://en.wikipedia.org/wiki/Gyrator#Application:_a_simulated_inductor So my question is, will this work? I don't know if this fake inductor can do the job in this case, so I'm looking for advice. Thank you!