Styrofoam Plate Speaker

Get surprisingly good results from disposable picnicware! Turn an ordinary styrofoam plate into a decent sounding speaker. Original project design from Jose Pino. See the Test Results in the video.

Step 1 What You Need...

1. Ordinary Styrofoam Plate
2. Sheet of regular paper
3. 2 business cards
4. A Piece of cardboard larger than the plate
5. Magnet Wire (preferably 30-32 gauge)
6. A neodymium magnet. I got mine from CMS Magnetics
7. Scotch tape
8. Hot glue

Comments

[jeremy_smith]

I made everything and checked it with a battery and it worked well, *BUT I HAVE A QUESTION*. i can't figure out how to hook it up to a jack and plug it into anything, i would appreciate the help, thankyou fellow DIYers.

[tmherrin]

Once I saw this on Kip Kay's website, I had my class at school make it - I got my magnet wire from RadioShack (it came in a package of three (red, green, and 'goldish'). I just cut a section of speaker wire from a spool of it (I had that laying around from a project - intially got it at Wal-Mart). I was unable to get sound from a headphone jack - I don't think they are powerful enough. I ran mine from my amp (Technics circa 1960 400watt) and it played great (for a styrofoam plate mind you).
We did find that the thinner wire that came in the RadioShack package was better than the middle-sized wire and we could not get the larger wire to work at all.

[jeremy_smith]

I NEED HELP!!!!

[its2l8men]

buy a jack

[spikelea]

if i remember correctly, mythbusters tried this and it didn't work. is that just me or did they do it wrong. Also, where do you get the cables he used to hook it up?

[bigjeff5]

You remembered incorrectly - this is basic speaker design. Pretty much all speakers work exactly like this, they just use different materials (bigger magnets, more optimum diaphragm materials/shape, more compact frame, etc). The principals are identical.

As Fred the Penguin said, what Mythbusters tested was a hoax posted on the web, saying that you could just attach a penny to a paper plate covered in aluminum foil, then attach one audio lead to the penny and one to the foil and get sound. Since no electromagnet is created by the penny, and there is no permanent magnet to attract or repel, no movement occurs. Since there is no movement, there is no sound. Thus it was a fake.

Look up "penny speaker" and you'll see the difference between that fake speaker and this real speaker.

[egriff]

you know this is working because the plate vibrates.

[Fred the Penguin]

they used a different system by household hacker.

[jnunez8]

what if i use bigger size magnet????

[beginnertoday]

OK I luved it but would like to know how to connect those two (magnetic or copper whatever they were)wires to the headphones and is it necessary for the resistance to be close to 8ohms and can one use it with mobiles:)

[Blubber300]

What if the magnet was donut shaped?

[lunarpanel]

Thanks for this great Instructable, I did a instance of your design that uses a 1/8th of an inch wooden flexure instead of a styrofoam plate: http://www.flickr.com/photos/jeanbaptisteparis/4797539302/in/set-72157624500231474/
Cheers, Jb

[aduy]

can you make a jpg of that pattern so i can print it out?

[jbertjj123]

its cool... thanks for teaching....

[Dream Dragon]

Looks really good, is there a reason you went for two suspension units? I'd think it would be more stable with 3, but maybe stability isn't a major loss in this system? It's an interesting demonstration of the principle in any case.

[ekswen]

Never posted anything hre before. Question, made the speaker, worked, but could get no volume from it. Held ear close could here speaker. Wrong magnets, too little wire on the core. I am an old geezer, help

[merseyless]

i was bored, so i made an astable multivibrator at 5v and put 20 winds around my finger. the wire had a large enough gauge to support the coil and i just suspended it over a magnet with a paper cupcake cup. that buzzing sound made my day

[AMP678]

this is so cool! does the shape of the magnet matter?

[Numex]

cylindrical is preferabal but it doesn't really matter. you'll need neodymium though because they have to be strong. they're only a buck or two

[AKninja04]

Would electrical tape have any affect on this project instead of clear tape?

[zvillesurfer]

electrical tape should be fine.

[LkArio]

This is an awesome instructable!

[Da Nugesta]

Fantastic 'ible but you do not know the impedance of the coil so you could damage the amp! :(

[Da Nugesta]

oh sorry just read about the multimeter checking (stupid me) duh

[mman1506]

you know that kipkay didnt make this a article in make magazine shows how to do this (like stated in video) wich wasnrt written by kipkay

[bizz]

brilliant!! haha ordering my magnets now - where did you get your wire from? x

[zwllwy]

You can find some wire in a local electronic market. I got the magnets there as well.

[SRChiP]

If not cone or flat, what type of speaker is the Hard disk one? (No diaphragms.) I found out that keeping the head's coil near the magnet is enough to make it hear. (Even holding it in hand)

[dombeef]

Cool!

[wotot2]

Is it critical which polarity you glue down with the permanent magnet?

[rk1776]

no, here u are creating an electromagnetic field. polarity is only crucial when u are using multiple terminals or hooking up some sort of complex system

[AUAnonymous]

From what I guess no, because gluing the magnet one way up instead of the other way up would essentially do the same things as connecting the alligator clips to the opposite wire of the headphone cable.

[jimmytvf]

the plate creaks a little but it's a great speaker for the price of it nice speaker kip!

[rk1776]

try a syrofoam bowl, not so flimsy

[kaaaaabooooom]

just made one it really does sound great but theres just one problem when my one is used for more than about 30 seconds it starts smoking any idea how to eliminate this. thanks.

[rk1776]

u probably dont ave enough resistance for your output check your stereo or whatever u are using and use an ohmmeter

[danimal310]

try more wire on your coil.

[Father Christmas]

my guess, the current is too high, but i dont know much about these things.

[shams]

yes man this thing rocks.but i think it can only give you midrange right?not the higher notes or bass?

[rk1776]

depends on what u use for your diaphram. a flimsier and larger diaphram causes more bass while a firmer smaller causes more high range