Knock sensor + amp

LM2940 non-inverting amp, no pulse stretcher yet.

All this amplifier business is a black art of its own. In retrospect I must find that all the lectures I've taken at uni regarding electronics were only capable of teaching the very basics, if at all. I didn't study EE though, but some other natural science which is highly unpopular among most people, especially at school. And I still don't know sh*t about you name it. So much to know, so much already forgotten.