Analog Synthesizer Do It Yourself - You have just discovered one of the coolest analog synth resources on the web. Check it out, build something cool, have fun.
Ray Wilson - Music From Outer Space
"This is a beginner project and I do recommend it as a first project or if you are just getting started in synths or electronics. The circuit, layout and wiring diagram are provided to help you succeed."
Try Building A Simple - Weird Sound Generator.
"This is a really fun project and it makes a LOT of weird sounds. You will have hours, no at least days... weeks of fun making weird sound after weird sound."