Im just a novice, my first year in electronic, and I wanted to create a function generator without having to use one of them IC like the XR-2206 which seem to be very promissing. I thought about using the 555 but unfortunately I believe that 100kHz is the max stable frequency that It can be vary it to I think, and so I looked up my text and saw the coltpitts with crystal and a tunning cap, and wasn't sure about the range that It can be vary.
So yah, if you have other suggestions, please let me know. Thank you very much, I appreciate all the help