Picture of Tennis ball stereo (TBS)
A mono stereo made out of an old mini radio, a tennis ball and some 99 cent headphones , bye the way this is my first instructable so sorry if it sucks. Sorry for the fuzzy pics.

Step 1: Materials


Head phones
A tennis ball
a speaker about the size of a tennisball


Hot glue gun
a very sharp knife
soldering iron
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zv_odd8 years ago
huh? What have you used in the end prodict for the black bit? How is it all attached? There is a mental blank for me as to how you go from step 3 to 4. Where is this plus side or even the negative side. What object are you talking about?
i think he means take the radio and solder the radio t o the  headphones
89joho876 years ago
Really cool! How does the sound work? Is it listenable?
when I try to hook up the speakers, the speakers don't emit a sound, can anyone help me?
alex44216 years ago
what speaker is that ? watts ? ohm ?
dodo91 alex44216 years ago
does it matter?
yeah i just cut a slit into a full tennis ball and stuck two speakers in it then seal it back up...so its just a tennis ball with a headphone cord comming out of it...kinda quiet but pretty sweet...ill make an instructable on it some time
i was ganna say that when i saw the picture!
JellyWoo7 years ago
can you explain step 3 a little more clear? i don't really understand.
thatguysbow7 years ago
hmmm i may try this with a set of old cd player speakers i have sitting around
mkamchin7 years ago
how do you attach it to something to make sound?
one cool thing you could do is put a piece of metal inside the ball at an angle so that when finished, the tennis ball would point kinda sideways instead of up. very cool instructable!
dansheadel7 years ago
This was a very good idea! I did this with some old speakers I have, and have two matching halves now. You should really describe how you cut your tennis ball in half. it looks wonderful! Mine wound up with all sorts of jagged edges all over it from where I botched the knife work.
"very sharp knife"
gbosbiker7 years ago
what you have to do now is to take it a step farther. make two that run at the same time from the same source and link them together to make the over-the-top-of-your-head kind. thats would make it ten times better. and not have to worry about the loudness because they would be right at your ears.
awkrin7 years ago
nice idea, but u could add a few simple leds throweys or add a(or more)transistor/s to the leds and make them "dance"
jtcrules7 years ago
Pretty sweet, although mine kinda turned out... awful. :(
osgeld7 years ago
hehe mono stereo, next years marketing catch phrase good idea needs an amp .. makes me think :) i like it, what would be pimp tho is to have both halves for left and right that (sorta) look like a single tennis ball when in storage my 3 cents about cutting the ball in half option 1: super sharp utility knife with the blade only half way out, and a strict regard to your hands, fingers, belly, chest and face OR option 2: sharp bread knife, act like its a fat bagel, and have a strict regard to your hands, fingers, belly, chest and face, its safer than the utility knife if you take your time its cleaner too, and its not asking you to jab a rubber based ball with a razor blade, which IMO is always good OR option 3: since i have access to a band saw i just used that (thanks dad) and a strict regard to your hands, fingers, belly, chest and face
Hypocaust7 years ago
Very nice job. You should sell them and get cash for the. Excelent Instructable!!!
hogiewan7 years ago
Very cool Idea, but "mono stereo" is a bit of a misnomer.
that is very cool.
power7 years ago
did you have any idea on how to make this speaker louder??? my speaker make very soft voice.
idiotjohn power7 years ago
To make the speaker louder you need to run it through an amplifier. The smaller headphones work without an amp because they are so small and have such small resistance but when to get to 9ohm large speakers you need to buy an amp. If you want to do it DIY you can buy kits to make an amp... just cheack out RadioShack (US) or DickSmith Electronics(Aus) or Jaycar Electronics (Aus)!
Mintyhippo7 years ago
that is a cool idea
oshidutako8 years ago
that's pretty cool. really simple too.
sofa0ne8 years ago
Sorry to be a grammar nazi, I normally wouldn't say anything because normally I am making far worse mistakes but saying "mono stereo" just doesn't work for me... Stereo normally deals with the transmission of sound from two sources through two channels. Mono normally deals with the transmission of sound from one source from one channel. So having cleared the air about that... it's a fun concept and a pretty cool idea, hows the sound quality?
I am almost sure that if a good survey was made, we would discover that 80% of people doesn't have idea of what it means "stereo."
LOL I thought the same thing.. Mono stereo Kinda an oxymoron
suggsugg8 years ago
cool, check out my tennis ball ipod dock. I have made tons of ipod accesories out of tennis balls, i just never posted them. I have never tried a tennis ball speaker though, its pretty cool im gonna try and make it.
picky8 years ago
This is fair mad! im gonna try it tomz
Austinisi8 years ago
How would you add an extra power source????
there is nothing to power
for more sound.
you mean an amplifier, a good one to use might be something like the "Cracker box amp" in the new make
Put a protective covering on the top of the speaker and then you can bounce your speakers while listening to music!! That would be pretty cool. As for an amp, just buy a kit or get schematics for one over the webbernet.
tomonto8 years ago
ok, i like the idea but im not as learned as you people, i tried it....less than ok. i need more directions. any help?
e13378 years ago
Where did u get the speaker
sweetdude101 (author)  e13378 years ago
I got it from an old mini radio sort of thing
sweetdude101 (author) 8 years ago
I just have 1 question: How would i apmlify the sound, or what would i solder to do it? please if you know tell me so that i could make adjustments to my future edition of thin instructable. thank you.
mini amps are a pita 2 make lol
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