Bit Shitter is a voice changer / pitch shifter based on the ATtiny85 microcontroller, It can pitch your voice up, so you sound like an annoying blue frog, or you can pitch your voice down, making you sound like some kind of enormous mutant space shark, or a friendly demon of the nether realm. It has two pushbuttons (to pitch up or down by incremental steps) and one microphone. The sound is sent out through a 3.5mm headphone jack.
This is a suitable circuit for beginners who are learning to solder and the build instructions will guide you through the process one step at a time, helping those in need along the way. The whole process takes approximately 1 hour. Once its done just plug your headphones or speaker into the output jack and the Bit Shatter automatically switches on. Speak into the microphone and allow your mind to be blown.
After that you are free to use your bit shatter for whatever you like, annoy your friends, prank call your teacher, communicate with birds, the possibilities are endless.
This exists as a kit that can be assembled followingthese instructions, or as an assembled unit.