Transducer
Strike said:
Well, I want to know how to build a speaker, you know, with magnets, cloth, metal, and the such. Im able to use an amplifier for my science project, i just need to make the speaker itself from scratch.
Electrically a loudspeaker is a transducer, so do you need to make a "speaker" as commonly defined or a transducer? If you make a simple transducer, depending on what it activates, it will make sounds/noise. Use an alternating current, from your amplifier to move the mechanical part, have it act on something You could even use something like a servo to bang a sheeet of aluminium or sheet metal. By controlling the frequency, you could make sound
Building what is generally considered to be a loudspeaker is not trivial, just from the construction side of things. You will need to construct a voice coil, get a magnet to interact with the voice coil and a membrane of some kind (the diaphragm) to push air, a way to hold it all together (basket), etc.
One other option might be a planar speaker, where a wire is vibrated and as the frequecey of the signal changes, the frequencey of the speaker changes.
Maybe some more details as to your science project might help?