I'm having a problem with sound amplifying and later with feeding this sound to my computer. First of all I tried to find the most basic transistor amplifier possible (to understand the concept), the simplest thing I've found is this simple amplifier scheme (if you have a simpler scheme or a tutorial please let me know).
I've implemented this amplifier with single NPN transistor. When I plug in a mic it amplifies the sound sort of (only around certain frequencies I believe), but when I plug in an audio output, it wont react.
Any ideas what might not be working? And does anyone have an amplifier tutorial with some basic relevant math in it?