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.

You can stop wondering about those mysterious keyboard function keys on the top of your laptop and desktop keyboards. We have the answers!

By sensing which circuit was modified, the keyboard can tell which key was pressed and transmit that information to your computer, translating finger motions into letters, numbers, and symbols.

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.

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

With only a circuit board, keyboard and tiny, blurry monitor, the circa 1975 computer looks crude by today’s standards ...