Yes, you too can have your very own function generator in a Juicy Fruit tin!
I know, the metalwork on display is totally crooked. I’m better on the design side of things, which isn’t to say I didn’t struggle with the PCB layout for a while. See?
But the thing to take away from my struggles is that I did the PCB layout for you. Head over to the project page, grab your laser printer and ferric chloride, and get started on a cheap and (relatively) simple sine wave oscillator.