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filter

How do I filter audio?

I just successfully hooked up an electret microphone to my PC, without burning either. I use a very simple circuit to pre-amplify the signal, using a single general purpose transistor (2n3904). The microphone is electrically separated from the amp by a capacitor (.1 uF). The same trick (.01 uF) is used between amp and PC.

Audacity is able to record sound and display levels. I am getting decent range across the audible spectrum.

Makes your servo moves in a smooth way
                          I’ve been working on this for a while and finally I have the courage to post the results. Read more