Different speaker design: (two magnets instead of one, and one electricity direction flow)

TROLL ALERT

Skybuck Flying formuleerde de vraag :

I know very well how magnets work I played with them when I was a child ;)

You seem to forget that metal is attracted by magnets too.

So for each magnet there would be some metal.

There could be many different designs.

Here is one example:

magnet - power /\\ up metal | |

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On Tue, 11 Aug 2009 14:30:05 -0700, Pim Schaeffer wrote (in article ):

Is he a troll? I just figured he was some non technical type who was a bit confused.

On Tue, 11 Aug 2009 16:25:29 -0700, Skybuck Flying wrote (in article ):

The problem is that you don't know what you're talking about and its apparent from your posts.

He's not really a troll, although he's been advised on occasion that he needs to be a little more thoughtful in which newsgroups he posts too (often he has way too many), and that his "stream of consciousness" posts don't really help.

He is pretty young, if I recall -- somewhere in high school.

Maybe, juusssttt maybe (unlikely tho) you one day may know a tiny bit about what you blather about.

Let me retract that polyanna statement i previously made. You know so little that it is a wonder you know how to turn on a light.

Just build one, and show us the demo.

Sheesh! Rich

One major problem is that the speaker cone must move in a controlled manner which follows a sinusoidal signal. Just applying and removing voltage makes it move abruptly and then slams to a stop when the metal hits the magnet.

Generally a speaker is most efficient when the mass of its voice coil and the cone are minimized and cone is rigid enough to move air without distorting, and the means of holding the cone is very flexible in the desired direction of movement but not allowed to move laterally which would misalign the voice coil within the magnet.

It is possible to make a speaker without a permanent magnet, applying current to an electromagnet as well as the voice coil, which can save some total weight, but usually you want the frame of the speaker to be as heavy as possible.

In old radios sometimes the speaker was made with an electromagnet which was also a filter choke:

There are also ceramic piezoelectric speakers which are very thin and lightweight, and use no magnets. See:

There are electrostatic speakers:

There is a moving-iron speaker:

Multiple magnetic field speaker:

Here are some inventions:

There is a lot of information in the Wiki.

If you understand all of the existing designs, and then have an idea that you think is better, please present it. Otherwise, you're just smoking some nasty stuff...

Paul

Ok this is a valid complaint.

I see two ways of solving it:

1. Trying to use timing to attract the magnet to the metal and then quickly let go of power to get the magnet in the correct position.

This might be difficult to do though if not impossible because of high precision timing requirements and shoot overs of magnetic strength.

1. Better way might be to use the strength of the magnetic field to move the membrane where it needs to be.

This would change the design from a simply on/off to a more (what I believe they call) an analog system/design...

Where the power/voltage fluctuations indicate the sinus wave...

So for example:

Would produce such a wave:

/\\ / \\ / \\

(Pyramid/JigSaw)

(The strength of the magnetic field is determined by the voltage/power/ampere/whatever ;) and can therefore be controlled by it...)

Bye, Skybuck.

That is exactly the problem.

Bm

You are the problem, suck your dick.

it does work however due to the non linearity of the magnetic field the sound quality is very bad. thats why a moving coil in a permanent field is being used. and a water speaker does exist. well hydraulic one.