Yes, there are chips available that achieve MUCH better results with a simpler circuit, but they are essentially "black boxes" that use digital methods to convert a voltage to a frequency. If you like my project, please rate it and vote for me! This Instructable does cover how to model a circuit (final step) and it does require the etching of a Printed Circuit Board based on that computer model. "To enter, post an Instructable that shows how to turn a virtual item into a tangible object." I believe this project qualifies, since I spent a significant amount of time modeling the circuit on my computer before going on to the build stage. This project has been entered in the "Make it Real Challenge", which awards a 3D printer to the winner. This design is capable of producing a square, triangle, and approximate sine wave reliably up to a frequency of around 300kHz. That's why I decided to build a semi-decent function generator as my term project in my analog electronics course.
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