I have to deliver a project for my analog electronics course and I wanted to build a synthesizer (the simplest version possible since I am a total beginner at this). It would basically be a function generator with a knob used to control the frequency (with maybe banana plugs for sound output). How would I go about building this function generator from basic components like capacitors, resistors and diodes? I read that a triangular wave can be generated by repeatedly charging and discharging a capacitor from a constant current source. How would the simplest version of this work? I have to actually build the project and I don't even know where to start.