Everyboy at some point has picked up a tennis racket and pretended to play it like a guitar. It's human nature. Well now you can do that but have it actually make noises too!
I first made this instrument a few years ago and have been meaning to put up a guide ever since. This won't be a step-by-step 'do this exactly' type instructable. I'm going to show you how I did it, highlight the important parts and let you realise you could have done this all by yourself if you really wanted to.
You Will Need (roughly):
Wooden Tennis Racket
A Piezo Transducer (http://www.maplin.co.uk/piezo-transducers-3202
A 1/4” Mono Chassis Socket (http://www.maplin.co.uk/1-4-mono-chassis-socket-1252
3 Tuning Pins (I got mine here: http://windworld.com/products-page/hardware-for-acoustic/zither-tuning-pins/
although if you want to go proper DIY, check out my post on DIY tuning pins here: http://www.vulpestruments.com/2013/02/a-note-on-diy-tuning-pegs.html)
Some scrap wood
A few bolts