Hello,

I'm a beginner when it comes to electronics, though I know a thing or two from the physics course.What I have is this: a speaker, a battery and a coil. Is it possible to connect the three together so that I could create a somewhat of a sound wave that would sound just like a note.

To my current understanding, if You connect a coil to a DC, the changing current in the coil should generate an electromagnetic field which would induce an opposite current. In result, the "main" current would increase "gently" (become an AC (?) ), in my theory creating a sound wave from a hooked speaker.


If You see a mistake in my thoughts, please post the correct explanation of what do I need to do to produce sound. Thank You for Your time.

 

Are you talking about putting the coil in series with the speaker?
I don't see how you'll get ac from this parts list.

 

Then how could I get AC from an DC. Is the coil not enough? What is then?

 

Here's something written by one of our Moderators.
http://www.allaboutcircuits.com/vol_6/chpt_6/7.html

It's a 555 circuit, an audio oscillator. It's not ac, but I think it will do what you want.

 

If you want to make sound you will need oscillation of some sort.
If you want oscillation then you will need some sort of amplifying element , for example a transistor
You can make very simple oscillators using a few resistors , capacitors/coils and a transistor

 

What is the size and voltage of the battery?
What is the impedance and wattage of the speaker?

If you get some hookup wire and just connect the speaker to the battery making random connections you will hear crackling sound from the speaker.

Wait until you answer my questions before doing this otherwise you are at risk of blowing the speaker.

 

First thing, forget about the coil. A coil in series with the battery will produce a 'pop' or 'click'. A 'note" or tone as you understand, is an AC or alternating frequency.

As suggested, to produce a note or tone, an oscillator operating in the audible frequency range is needed. A sine wave oscillator provides the purest tone.