Polarity....Physics
- Thread starter RumbleNTheTrunk
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RumbleNTheTrunk
OlogyAudio
10+ year member
Audio-Ologist
There are + and - terminals for the speaker.... If you hook the battery up with + terminal from battery to + terminal on speaker... and - on battery to - on speaker the cone will move one way... and if you invert the + battery so that it is connected to the - speaker... and the - battery to the + speaker, the cone will move the other direction.
Depending on the direction of the current flow... you will get a force applied in one direction or another. This is how a speaker works.
Kinda rly abridged but you can change the polarity by A. Flipping the magnet poles... (you would have to disassemble the speaker... HAH) Or B. Changing the direction of the current... (flipping the wiring)
Black_Jesus
10+ year member
The Unexpected
dpdt switch.
edit: with a center off...
radioshack has em
edit: with a center off...
radioshack has em
mattmcss
10+ year member
Shake that laffy taffy
x2 on the dpdt
basics physics of what your amp and speaker do:
a speaker is a coil suspended within a permanent magnetic gap
copper is a magnetically inert metal
meaning that unlike steel it won't be attracted to either direction of the magnetic gap
Once charged however, with DC or AC current it will move in whichever direction the positive signal is given... so if you wire + to + it will move out and if you wire + to - it will move in
where that line is the coil itself, usually made up of 4-6 layers of windings wrapped around a former
your amplifier is basically a huge DC to AC converter
it converts your low level RCA AC current (music is AC current) and amplifies this... this amplification proportion is called the gain of an amplifier....
most good amplifiers use a op amp gain system (meaning a simple dial opamp that boosts that RCA signal proportionaly as you turn that gain knob), most really classical amps simply use a pot (potemeter) which is basically a large knob that as you turn it adds more or less resistance to the input signal (RCA)
AC current is this:
where you have a signal pulsing and that pulsing is going back and forth for every Hertz of the note given a full second of playback, for instance 50hz you'd have 100 ridges... 50 positives and 50 negatives all in 1 second
for instance your wall outlet is 110v at 60hz
this pulsing of the electicity is the force
AC current is a switching polarity as you can see by that graph
DC current looks like below:
where the current flows in ONLY one direction
as you can imagine DC current would heat up a coil far faster as the coil isn't moving (which is just about all of the cooling within a speaker's motor"
I don't think I'll ever have the patience to answer this question fully again //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif
a speaker is a coil suspended within a permanent magnetic gap
copper is a magnetically inert metal
meaning that unlike steel it won't be attracted to either direction of the magnetic gap
Once charged however, with DC or AC current it will move in whichever direction the positive signal is given... so if you wire + to + it will move out and if you wire + to - it will move in
where that line is the coil itself, usually made up of 4-6 layers of windings wrapped around a former
your amplifier is basically a huge DC to AC converter
it converts your low level RCA AC current (music is AC current) and amplifies this... this amplification proportion is called the gain of an amplifier....
most good amplifiers use a op amp gain system (meaning a simple dial opamp that boosts that RCA signal proportionaly as you turn that gain knob), most really classical amps simply use a pot (potemeter) which is basically a large knob that as you turn it adds more or less resistance to the input signal (RCA)
AC current is this:
where you have a signal pulsing and that pulsing is going back and forth for every Hertz of the note given a full second of playback, for instance 50hz you'd have 100 ridges... 50 positives and 50 negatives all in 1 second
for instance your wall outlet is 110v at 60hz
this pulsing of the electicity is the force
AC current is a switching polarity as you can see by that graph
DC current looks like below:
where the current flows in ONLY one direction
as you can imagine DC current would heat up a coil far faster as the coil isn't moving (which is just about all of the cooling within a speaker's motor"
I don't think I'll ever have the patience to answer this question fully again //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif
This is probably the most important statement he made if you're planning on doing this with a speaker of yours.
If you're using a small speaker (i.e. one with a small VC) then you should be careful while you're doing the experiment to ensure that you don't fry the coil. View req's little "fun" thread and you will see why. Now, he was using an 18V source IIRC, but at any rate just don't keep it on there forever...or the chances of the coil burning increase greatly.
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