Symmetric peak detector
This is just a mirror extension of a circuit I found which is probably really classic anyway. It was intended as a measurement circuit, to help me know where exactly my signal was getting to in terms of peak-to-peak values without having to use an oscilloscope. I actually have a soundboard oscilloscope for my PC but its not really that reliable - I think the static and stuff was messing heavily with it too. So I made this, but I've never tested or used it because, again, other solutions were found.
Import data for Circuit Simulator
This is actually not really my design anyway and its pretty straightforward to be honest. All I had to do was reverse a diode :0 yeah, I'm THAT awesome :P
A nice way to monitor your circuits peak to peak values if thats all you need.