Hi everyone, this is my first instructable. I hope you enjoy it! In this instructable I will show you how to easily make an electronic metronome, at the heart of which is a 555 timer. I found the original plans for this and the circuit diagram here. Here is a video of the metronome. It has two LEDs and a speaker. For each beat, it clicks and switches the LED that is lit up. You control the speed of the beats with a dial.
http://www.instructables.com/id/How-to-Make-a-Metronome/