If you thought you looked cool walking around town with studio headphones on, attempting this DIY mod will put you on par with Shaft.
"Some say rust and electronics don't go together. Some say you must properly ground old electronics. I say that having a ungrounded, old, rusty 1300 RPM propeller near my head is better than being hot!"
Better you than me, buddy!
From the submitter: I bought this microwave oven for R$ 20 to fix it and use. Unfortunately, it is IMPOSSIBLE to find the keyboard membrane in Brazil. In USA, just the membrane costs $80!!! So I traced the keyboard circuit and made a new keyboard for it :)