sound frequency resulting from coil windings

[jikwan]

hi everyone
i need to understand how to get a particular frequency
from the coil winding
i dont know how it works
i am thinking that if you send current through a coil you ll
get a certain frequency from a certain number of windings
can someone help me with this?

 

[Bluejets]

Frequency in (power)is frequency out.(sound wave)
Motor coils act like speaker coil at high hz.

 

[(*steve*)]

If you wind a coil loosely, the windings will move in the presence of the magnetic field and buzz in time with it.

 

[hevans1944]

@jikwan: Welcome to Electronics Point!

Hows about telling us what you are trying to DO before winding any coils?

 

[jikwan]

appreciate the replies.
this way i can understand the subject by studying the small
pieces you give. if i study the text book it might take
much longer

heres what im trying to do
i have a metal object that i could strike, record the sound
and put it through a sound editor programe and find the
exact frequency of it
im wanting an electrical wiring way of generating the same
frequency from the wire
say my object has a freq of 450 hz, i need 450 hz from the wire
i can use a speaker that gives 450hz but i dont want to use
that way
is this possible you might ask----- its easily done using a
tuning fork with 450hz freq
everything, every object has a frequency
so i listen to electric devices and hear a humm and think
coil winding does that
so exactly what im after is to place wire/ coils of wire near
my metal object causing resonance in the ame way you
get resonance using a speaker and tuning fork
i ll give $20 000 for the formula


i plan on buying some lottery tickets!

 

[jikwan]

i am thinking there is a sound that the wire makes
i could record that sound and might find it to be say, 728hz
and by shortening/lengthening it i ll get it to be exactly 440

 

[(*steve*)]

Thanks for the explanation. It tells us more about what you (mis) understand than what you want to do, but that's ok.

Making a wire vibrate is *exactly* what a speaker does. It also has a surface (often a paper cone) attached to help make the air vibrate so we can hear it better.

Also, a tuning fork and a speaker don't "resonate".

And every object doesn't "have a frequency". In particular, any object that you strike will produce vibrations at many frequencies at different relative intensities which may vary over time and/or depending how hard, where, and with what you strike it.

 

[hevans1944]

Getting sound from electricity requires a transducer (Google that!) to convert electrical energy into sound energy. There are many ways to do this both intentionally (loudspeaker) and unintentionally (transformer hum). To excite your metallic object (such as bell) with sound waves is different than exciting it electrically. Depending on the type of metal, it may be possible to excite it electrically using magnetostriction from a suitably placed coil of wire. Nickel, for example, contracts when inserted in a strong magnetic field and this effect is used to make very powerful ultrasonic transducers. But, as Steve noted, you still haven't told us what you are trying to DO. Or why the solution is worth big bux. More details, please.

 

[jikwan]

Thanks for the explanation. It tells us more about what you (miss) understand than what you want to do, but that's ok.

Making a wire vibrate is *exactly* what a speaker does. It also has a surface (often a paper cone) attached to help make the air vibrate so we can hear it better.

Also, a running fork and a speaker don't "resonate".

And every object doesn't "have a frequency". In particular, any object that you strike will produce vibrations at many frequencies at different relative intensities which may vary over time and/or depending how hard, where, and with what you strike it.

i suspect i got a whole pile more misconceptions---i dont
have many electrically minded friends
so, i take it that all i have to do is take the speaker wire
and disconnect it from the paper that makes it vibrate
that wire will deliver say, the 440hz that i require
if i solder that wire onto my metal object (which has the
freq of 440).........it should vibrate at 440
does that sound about right?

 

[Bluejets]

Windings don't have to be loose to play a tune....look at brushless motors.

 

[(*steve*)]

Well kinda...

The speaker coil typically moves within a magnetic field. The coil is connected to the cone and it also "floats" in the magnetic field. The magnet and the cone are not connected (well the kind of are, but by flexible material allowing them to move independently.

If you were to remove the cone, leaving in place the other stuff holding the coil, and attach the magnet to something solid, and the "metal" to the coil, you might be able to make tho work.

A better alternative is a surface transducer that is designed to transfer vibration to the surface it is sitting on. There are rechargeable Bluetooth "speakers" of this nature that you could far more easily use.

 

[Bluejets]

 

[jikwan]

does a good job but uses a whopping 10A!

 

[jikwan]

thanks a lot for the great replies
i do realize that the more information i give about what
exactly im trying to do---the more appropriate the answers
will be
this ive been avoiding because the nature of the device im
trying to design is considered too dangerous and this may
well be the final post and the mods will lock the thread
but maybe not, lets see...........

ive been building devices that produce hydrogen for decades
(on and off) and never had problems. hundreds of thousands
have used these devices without much problem
its exactly the same with electricity---if you know what youre
doing its safe---dont know what your doing youll get burnt
i simply need a stainless steel tube to vibrate in water at a
certain frequency. and thats it---nothing more

why do i want this? the hydrogen production increases x10

if the moderators decide to close it im ok with it
but if theyre flexible i will persue it

big dollar? just joking

 

[Alec_t]

If the stainless steel is magnetic then a solenoid coil could vibrate it. If it's non-magnetic then a piezoelectric transducer could do the job.

 

[jikwan]

If the stainless steel is magnetic then a solenoid coil could vibrate it. If it's non-magnetic then a piezoelectric transducer could do the job.

the transducer as i understand it reacts to pressure and change. the object it would be attached to is completely
stationary. but if its switched on and it vibrates all by itself
then that would do the job in a way. it would be used as
a mechanical vibrator

exactly what im after is resonance
for example, the two forks of a tuning fork shake horizontally
when theyre struck. both forks (tines) move out and in at the

Getting sound from electricity requires a transducer (Google that!) to convert electrical energy into sound energy. There are many ways to do this both intentionally (loudspeaker) and unintentionally (transformer hum). To excite your metallic object (such as bell) with sound waves is different than exciting it electrically. Depending on the type of metal, it may be possible to excite it electrically using magnetostriction from a suitably placed coil of wire. Nickel, for example, contracts when inserted in a strong magnetic field and this effect is used to make very powerful ultrasonic transducers. But, as Steve noted, you still haven't told us what you are trying to DO. Or why the solution is worth big bux. More details, please.

same time. thats the action i want. people have used
vibrators before and found an improvement but nowhere
near 10 times increase that im after

one might ask..... has this resonant frequency ever been
achieved? yes it has but no one is giving the formula away

 

[Bluejets]

10A too much..??

Ok then...there is this 5V @100mA.
https://www.adafruit.com/product/1201

 

[(*steve*)]

one might ask..... has this resonant frequency ever been
achieved? yes it has but no one is giving the formula away

It is known as the "brown note".

 

[jikwan]

It is known as the "brown note".

har har har har

 

[jikwan]

10A too much..??

Ok then...there is this 5V @100mA.
https://www.adafruit.com/product/1201

that is very cool, cheap and requires next to nothing power
i may end up using a pile of them. thanks