Audio from the keyboard’s PCB is played on the speaker and a TDA2022 low-voltage amplifier boosts the signal from the microphone. The end result is a very cool ethereal metallic effect.

The [Tymkrs] crew has come up with a pretty neat circuit bent toy keyboard hack. It’s been a while since we’ve seen a good circuit bending hack. This project started as a way to demo th… ...

Now you can thanks to Makey Makey, a simple circuit board that turns almost any object into a computer key (see video here).

It feels a lot like InFocus’s $99 Kangaroo PC, which similarly stuffs an entire Windows computer into a pocket-able form factor, but trading out the Kangaroo’s battery for a floppy keyboard.