For my final exams in school I had the ability to write a paper. I decided to do so in physics about analog passive filters in electronic engineering. It explains the fundamentals of analog filters in german and also contains a series of experiments to check the predictions with a simulation and with reality. The PDF can be downloaded here:
Download 'Analoge passive Filter in der Elektronik' by Nico Einsidler (German)
Note: You must not use any parts of the document, but it can still be distributed and shared! For questions please contact me.