555 Oscillator test
Jess just told me to "cut the shit and turn it down"-- this machine is really taking shape!
I used this diagram for the circuit (though I swapped out the 100K pot for a 1meg pot-- bigger difference between R2 and R3 = wider frequency sweep). It's a quick build and will only run you around $6 in parts. As you can hear, it isn't the most musical thing in the world, but for a rookie project, it's pretty satisfying. Give it a try!
Also, if you've built something around a 555 (or 556) chip and have a photo/video/circuit drawing of it somewhere online, be sure to leave the address in the comments!