Mechanical Wave Driver for Chladni Plate

Step 2 The Old Speaker

I started with an old speaker I found in the trash about two years ago. The cone was blown out and torn but the coil and wires were still intact. You may be able to use the stiff fabric used to support the coil. I decided to go with cardboard hoping it would give more support and a broader range of frequencies. I cut away all the old paper, cut the braided wires attached to the terminals, cut away the stiff fabric used to support the coil, and pulled the coil up out of the slot it fits in Be careful not to tear the little wires connecting the coil to braided wire going to the terminals. Leave a small ring of paper around the coil form.
Measure the bottom inside of the speaker. Use this measurement to cut a circle of cardboard out the same diameter as the lip running around bottom inside of speaker. Center the coil form on the circle of cardboard and trace around with pencil. Then use a razor blade to cut out inside circle. I also cut out a circle of canvas to sit on top of cardboard. which is really not needed but looks better. You should have a cardboard doughnut now.
There should be a lip with some paper still attached around the coil form. Insert the coil into the canvas and the cardboard and then push them flush against the lip of the coil form. Hot glue into place. Then set the coil form with attached cardboard back into slot. Check to make sure coil does not bind in slot, it should move with a bit of pressure. The cardboard sits on lip of speaker frame. Hot glue outside of circle onto frame.

Comments

[bansheekilla64]

could you use a subwoofer speaker for this? instead of a big regular speaker?

[astro boy]

 it might work but wouldn't be effective as subs are meant for low frequencies so it might be better with a regular speaker

[gabstar]

if i have a new speaker... do i still need to cut everything and leave it like this? Sorry if the question is stupid.... but i need to ask....