Created by
Created February 09, 2013
Last modified February 22, 2013
Tags microphone   op-amp  


This is actually the active 15 kHz LPF of the QuadOpAmpMAX 414BCPD. I wanted to verify that I have build it correctly.
Problem is that when connecting the output to the mic-input of the PC I don't see the correct frequency I am putting in, while on the scope it seems to be perfect.
My suspects are that the 5 V rms is too high for the mic input. There are some nice free SW to verify the frequency on the mic input like Spectran


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