Instructables member datenkrieger built an instrument from three kind of awesome – lasers, guitars, and synthesizers.

I was very inspired by all the youtube videos of laser harps but i found them all too big to bring along for a jam session or they needed a complicated setup and a pc etc. I thought of a guitar with lasers instead of strings.
Then I found a broken toy guitar similar to a guitar hero controller at a flea market. I’m already gathering too much electro-junk but i had to make something out of this.

A 555 timer IC provides each string’s voice, each triggered by photodiodes. Check out the step-by-step here. [via Synthtopia]