Introduction: Tennis Ball Stereo (TBS)

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

Step 2: 1. Cut the Tennisball in Half

Picture of 1. Cut the Tennisball in Half

this is pretty obvious, just take the knife and cut the ball in half

Step 3: Stereo Part

Picture of Stereo Part

take the 99 cent head phones and cut off the speaker part. then strip the two ends about a centimeter from the top. Solder one end to the plus side an one to the negative side.

Step 4: Glue the Speaker Into Case.

Picture of Glue the Speaker Into Case.

simple as that, now you have a mono stereo out of a tennis ball good job!


zv_odd (author)2006-12-28

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?

19samman98 (author)zv_odd2010-01-03

i think he means take the radio and solder the radio t o the  headphones

89joho87 (author)2009-05-01

Really cool! How does the sound work? Is it listenable?

jetsmiley123 (author)2009-03-30

when I try to hook up the speakers, the speakers don't emit a sound, can anyone help me?

alex4421 (author)2008-09-17

what speaker is that ? watts ? ohm ?

dodo91 (author)alex44212009-03-20

does it matter?

ShampooRobot (author)2008-12-19

yeah i just cut a slit into a full tennis ball and stuck two speakers in it then seal it back 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

dodo91 (author)ShampooRobot2009-03-20

i was ganna say that when i saw the picture!

JellyWoo (author)2008-08-11

can you explain step 3 a little more clear? i don't really understand.

thatguysbow (author)2008-08-02

hmmm i may try this with a set of old cd player speakers i have sitting around

mkamchin (author)2008-05-21

how do you attach it to something to make sound?

stonehenge360 (author)2008-05-15

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!

dansheadel (author)2008-04-04

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.

pyromanizak (author)dansheadel2008-05-14

"very sharp knife"

gbosbiker (author)2008-05-14

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.

awkrin (author)2008-05-14

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"

jtcrules (author)2008-05-14

Pretty sweet, although mine kinda turned out... awful. :(

osgeld (author)2008-05-13

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

Hypocaust (author)2008-05-13

Very nice job. You should sell them and get cash for the. Excelent Instructable!!!

hogiewan (author)2008-03-26

Very cool Idea, but "mono stereo" is a bit of a misnomer.

James (pseudo-geek) (author)2008-01-19

that is very cool.

power (author)2007-10-26

did you have any idea on how to make this speaker louder??? my speaker make very soft voice.

idiotjohn (author)power2007-12-01

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)!

Mintyhippo (author)2007-11-17

that is a cool idea

oshidutako (author)2007-07-19

that's pretty cool. really simple too.

sofa0ne (author)2006-09-19

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?

rimar2000 (author)sofa0ne2007-04-20

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."

linkspast (author)sofa0ne2006-12-23

LOL I thought the same thing.. Mono stereo Kinda an oxymoron

suggsugg (author)2007-04-01

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.

picky (author)2007-03-24

This is fair mad! im gonna try it tomz

Austinisi (author)2006-10-15

How would you add an extra power source????

admanrocks (author)Austinisi2007-02-18

there is nothing to power

Austinisi (author)admanrocks2007-02-19

for more sound.

admanrocks (author)Austinisi2007-02-19

you mean an amplifier, a good one to use might be something like the "Cracker box amp" in the new make

T3h_Muffinator (author)2007-01-27

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.

tomonto (author)2007-01-13

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?

e1337 (author)2007-01-04

Where did u get the speaker

sweetdude101 (author)e13372007-01-11

I got it from an old mini radio sort of thing

sweetdude101 (author)2006-10-25

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.

micronxd (author)sweetdude1012006-12-08

mini amps are a pita 2 make lol

rudolph (author)2006-11-22

"Sorry for the fuzzy pics" Um, you cut a tennis ball in half, then apologize for it being fuzzy? It's a tennis ball, of course they're fuzzy! My son (4.5 yo) is gonna love this :)

Killa-X (author)2006-11-17

I think I'll try this. I got 5 speakers laying around. head-set ones, and 4 inch ones. I never though of a tennis ball, but a paper cup. I happen to have a head-set cord so I can have 2 speakers too :D

sweetdude101 (author)2006-10-16

hello thank you for stuf yes why not zero.

sorry about this message it was my dog typing lol

wellcausedwall (author)2006-10-12

very awesome job, something to consider for maybe a future addition is maybe using better wires and adding a little bit of power to it? or speaking on the double speakers, maybe cut the ball in half and add a small spacer ring inbetween the halves and add a hinge so the speakers could be enclosed into a seemingly normal looking tennis ball. I think i'll be making this bad boy this weekend, your version...not my suggested extended version

Umm yea i have made the double speaker but i have not yet learned how to amplify it

eyeballer103 (author)2006-10-21

This looks awesome! I want to try it.

JordanZed (author)2006-10-21

I don't think you can have a mono stereo. It's an oxymoron. I suppose this has already been said somewhere above? Great looking speaker though. I think I'm going to do this (stero headphone though :o)

Joe93 (author)2006-10-04

Cool i will try this. Do u think u could add 2 speakers

sweetdude101 (author)Joe932006-10-05

Yes you can add two speakers by wiring the + side of both and the - side of both together.

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Bio: im very bored.....:P
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