Instructables
Picture of 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.


 
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Step 1: What You Need...

Picture of 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

Step 2: Build the voice coil

Picture of Build the voice coil
WP16StyrofoamPlateSpeaker_005.bmp
1. Cut (2) 11" strips of paper about 1/2 wider than your neodymium magnet is tall. A cutting board works best. Wrap one piece of paper around the magnet and secure it with tape.

TIP: Be sure you don't tape the paper to the magnet. Only to itself.

Then wrap the other piece around the first and secure it with tape.

TIP: Be sure you don't tape the second band to the first, only to itself to secure it.

Step 3: Finish the Voice Coil

Picture of Finish the Voice Coil
WP16StyrofoamPlateSpeaker_010.bmp
Remove the magnet and glue the paper coil in the direct center of the bottom of the paper plate. Remove the inside coil of paper. Re-insert the magnet. Using the magnet wire, start making turns, about 50-60.

TIP: Tape down the first piece so it holds as you wrap.

Try to wrap it tight. Then tape the final result securely with scotch tape. Remove the magnet.

TIP: You can use a multi-meter to check the ohms. You want to get as close to 8 ohms as possible. You must remove the enamel off the ends of the wire to make contact and the easiest way to do that is to burn it off with a lighter.

Step 4: Build the Suspension

Fold the two business cards into an accordian shape like a "W". The two cards are then placed symmetrically at opposite ends of the plate and glued down.
jubaernet1 year ago
I have tried this one. It worked. But, sound level is too low . It was more like a earphone in a large scale. Is there any way to increase the sound level.

*Did you wind the coil layer by layer or it was just a rough winding ?

Please let us know about the winding technique. May be others are waiting for this....
jubaernet1 year ago
I have tried this one. It worked. But, sound level is too low as a loud or ordinary speakers. I was more like a earphone in a large scale. Is there any way to increase the sound level.

*Did you wind the coil layer by layer or it was just a rough winding ?

Please let us know about the winding technique. May be others are waiting for this....
jnunez83 years ago
what if i use bigger size magnet????
Blubber3003 years ago
What if the magnet was donut shaped?
AKninja044 years ago
Would electrical tape have any affect on this project instead of clear tape?