Naked Science Forum
General Science => General Science => Topic started by: goofkid on 26/05/2005 20:57:05
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Hi everybody [:D]! I have an idea but am having some problems with it [:(]. Please help me out.
Click on the URL (below) to see and understand my experiment.
http://http://www.geocities.com/cooldanyal/temporarypreviewfile.html?1117075041625
I'd really appreciate your comments and concerns. Thx.
Goofkid
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What are you trying to achieve with the experiment?
Whether it makes the sound louder is largely a matter of what you plug the receiver for the microphone into - if it is a massive amplifier and speaker then it will get louder..!
you can definitely get wireless microphones the ones I have come across are the type they use on TV and concerts so not cheap - I don't know if there is a cut price version.
You could just make a wire to plug the walkman into a Hi-fi system, which would be cheaper...
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What i'm basically trying to do is to create a small (overall) speaker that, when plugged into a CD player, produces loud music (soud) [:)]. Now u did mention that there are wireless microphones. But where would i find a cheap yet decent one [?]?
Thx for your response thought. Appreciate it. [:D]
Goofkid
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You probably already know this but a microphone on it's own doesn't make sound louder, all it does is convert sound to electrical signals. The reason they appear to make things louder is that they are often attached to a big amplifier and speakers. You could use the wireless microphone to connect your cd player to your Hi-Fi system although this would be a bit silly when you could play the cd on the Hi-Fi system (even if you did want to do this you would want to use some sort of direct link rather than a speaker and a microphone as converting the electrical signal from your cd player into sound and then back to an electrical signal with the microphone will reduce the quality.)
There are two fundamental reasons why there aren't big speakers on CD players. The first is that to get good bass you need a big speaker because the lower the note the lower the freqency of the vibration so the sound wave is much larger (I can explain this more if you like but I am hungry).
The more fundamental reason is that loud noises take a lot of energy and you would have to carry a lot more batteries if you wanted to make them for very long...
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Also, if you stick a mike into a speaker, you will reinforce certain frequencies much more than others, leading to that loud whining feed-back sound during sound-checks. Which is not what you want I take it.
Looks like you're trying to get something out of nothing, like with a perpetuum mobile. Won't work. No free lunches in physics.
The living are the dead on holiday. -- Maurice de Maeterlinck (1862-1949)
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Can small speakers give good bass. (like really good quality)? Or do they always have to be big?
Thx alot for your response Daveshorts and Chimera. They helped me out quite a bit. [:D]
Goofkid
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Bass speakers need large volumes of air enclosed behind them, to get the booming sensation... or clever ways to shift air about using all sorts of clever designs, none of which would be portable. For most portable systems you just use equalizers to give the effect of added bass, by filtering and amplifying certain frequencies of sound. Modern ear phones (at least mine [;)]) are quite good at giving the effect of having a big sub by using really strong magnets (using rare earth elements mixed in like Neodyoum-Iron-Boron magnets), and the fact that they are close to your ear means you can trick your brain, since you haven't got much of a sensation of the sound travelling to gage how bass’y it is.
http://electronics.howstuffworks.com/speaker10.htm
Neil should get on this thread, doesnt he have like a hi-fi shop?
wOw the world spins?
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You could bypass all that ofcourse, and go for straight conduction of the lower frequencies via the bone. Not all vibration comes to you through the ears.
Could be a selling point even, to some, especially people into piercings and stuff... [:)]
The living are the dead on holiday. -- Maurice de Maeterlinck (1862-1949)
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Can you elaborate on what you mean by "go for straight conduction of the lower frequencies via the bone" part a bit?
[?]
Goofkid
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Sound is vibration. If you pass the lower vibration through a 'socket' in some bone at the right place, it would transfer the deep rumbling vibrations that are so hard to create if you go by air. To make the air transport something takes much more energy than through more solid matter to get the same effect.
The proposition is pure science fiction, but only because I think people would think the idea is a bit weird, sciencewise there is no 'implementation' problem that I can think of.
The living are the dead on holiday. -- Maurice de Maeterlinck (1862-1949)
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On your site I didn't see a thing about microphones, but about magnets. Maybe you want to hear some comments? If not don't keep reading :-)
Magnetism is related to electricity but it is not the same thing. Something that is electrically charged will be represented with a "+" or a "-" because electric charges can be isolated. But magnets can't be isolated. Magnets are made of groups of atoms called domains which are like tiny magnets. When they are all facing the same way, you get overall south and north poles. That is why if you cut a magnet in half, the part that was cut will become new north and south poles.
To represent a magnetic field you don't use "+" and "-" signs, you use arrows. The arrows leave from the north pole and end on a south pole. There are never any arrows that leave a magnet and don't go anywhere. Never!! The arrows show which way a compass would point if brought into the field. The more arrows per sq cm, the stronger the field.
Making a magnet levitate is relatively easy. All you need to do is know the strength of your magnets (how do you say an absolute strength for a magnet not mentioning distance? not sure of that) and how heavy they are. There is an equation that tells you how much force the fixed magnet will inflict on the levitating magnet. This force is of course in the upward direction, and the force of the mass of the magnet is in the downwards direction. as long as one is bigger than the other, the magnet will move in that direction. Once they cancel each other out the magnet will levitate at a constant height. the distance of the floating magnet to the fixed magnet changes the field strength the floating magnet is experiencing which is why the magnet changes height until the force due to field strength = the mass, and it stays still. I think the equation is F = B1B2/d^2 but I could be wrong. The equation for the force due to mass of an object is I think F = 9.8 times mass in kg???
In short, to find the height at which the magnet will levitate,
9.8Xmass in kg = B1B2/d^2
d^2X9.8Xmass in kg = B1B2
d^2= B1B2/9.8Xmass in kg
d = SQRT (B1B2/9.8Xmass in kg)
if wrong equations or dodgy maths you can fix it easily enough !!! sorry if wrong equations im very forgetful....not even a year ago that we did magnetism lol!!
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Oh, and also if you have three magnets like in your diagram, just equal out the forces which is easy because they're all on the same line, no vectors to worry about. The top-most magnet's force on the middle will be down and will of course decrease the height of floating of the middle magnet.
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oops, unless they're opposite poles which I assume is what you meant in your diagram, sorry! lol
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woops! sorry, wrong URL. Thx for replying to the magnet experiment though. I needed help on that too. [:D] Thx Quantumcat [;)]
here is the URL that I initially intendet to show everyone:
http://http://www.geocities.com/cooldanyal/Goofkid_LoudSounds.html?1117297899843
And thx Chimera [:)]!
Goofkid