A simple 555 timer circuit that can control a buzzer. I made it piece by piece and then I outlined it on here. It is probably not the optimal design as it was very much trial and error, but if you have a buzzer and the components, you have a rough musical instrument that will play three notes. Note that the buttons pressed together create a different resistance which will produce a higher tone. I would LOVE feedback on any conventions that I have completely screwed up. I am very much an amateur learning as I go. But the circuit does work.
