How Does A Moving Coil Microphone Work

If you are not new to music or the world of microphones, there are several times when you must have heard someone mention something like a dynamic microphone. A dynamic microphone is simply a dynamic moving coil microphone, and these are microphones that are best used for broadcasting, recording studios, and live stages, but how does a moving coil microphone work?

If you are keen on how a moving coil microphone works then you should be constantly asking yourself how important this microphone is for it to be on the lips of almost everybody. If you are on this page then you are looking for a post that will tell you more about the moving coil microphone, and we are pleased to tell you that you have found the right page. You need to stop looking for answers if you have been searching for answers to this question.

The first aspect we will like to address in this post is to break down exactly what a moving coil microphone is, so read along with us as we throw more light on what the moving coil microphone is all about.

What Is A Dynamic Microphone

Dynamic or moving coil microphones makes use of a transducer in the conversion of sound waves to microphone signals through the use of electromagnetic induction. There is a conductive coil that you will find attached to the diaphragm of this microphone, and this conductive coil oscillates inside of a magnetic field to cause the diaphragm to move. Based on this movement, there will be an alternating current voltage passed across the coil.

Interesting, the alternating current signal that is sent out is sent out as a microphone signal. Now that we have explained what a dynamic microphone is, you might want more answers regarding how it got its name. Well, not to worry as that is exactly what we want to take a look at next.

There are people who thing that dynamic microphones come with a unique or dynamic feature or build compared to condenser microphone types, and you are very correct when you say something like a dynamic microphone possesses a dynamic sound range. Truly, the dynamic range of a dynamic microphone is greater than that of the condenser microphone, and that is where it got its name from.

Switching From Dynamo To Dynamic Microphone

Without several arguments, dynamic microphones are more dynamic compared to condenser microphones, and this is because they posses a no-self design and maximum sound pressure levels. Dynamic microphones earned the name from Dynamo who we consider as their predecessor, and this might prompt you to ask questions like, what is a Dynamo? Just like other microphones, dynamo microphones works like transducers.

This is because they are also designed to use electromagnetic induction to convert mechanical energy to electrical energy. Dynamo microphones are designed to function using the rotating coils inside of an electromagnetic field, and you can trust dynamo microphones to produce direct current. However, its audio signal is known to be an alternating current.

Dynamic microphones might have been designed using the dynamo microphone’s principle, but they are yet to be considered as dynamo microphones. A dynamic microphone possesses a coil of wire which is designed to move in a magnetic field’s front and back direction, and this movement will induce alternating current to spread across the coil of wire. Technically, there are little AC dynamos that are found in a dynamic microphone. They are called magnetos.

How Does A Moving Coil Microphone Work

How Does A Moving Coil Microphone Work

Meaning Of Moving Coil

Al moving coil microphones are considered to be dynamic microphones because they act as transducers that make use of an electromagnetic induction to work. What we want you to note is that not every dynamic microphone has a moving coil, and the popular ribbon microphone is considered as a dynamic microphone. This is why the term moving coil is used to differentiate dynamic microphone with moving coils and the ones without moving coils.

Moving coil microphones are more common and popular than the ribbon type microphone, but the word ‘dynamic’ is used in describing each and every one of them. It is better or okay to refer to some microphones as ribbon microphones, instead of calling them ribbon dynamic microphones.

Moving Coil Or Conductor

Not everyone is aware of what an electrical conductor does or is, but we can classify them as objects that allow electricity flow through them in every direction. The moving coil of a dynamic microphone is tightly wound, and this coil has a conductive wire of small diameter which looks like a tiny ring. The coil functions by moving alongside the diaphragm inside of the electromagnetic field, making it a core part of the closed circuit.

A transducer has a vital two-key part, and a moving coil is one of those parts. Moving coils helps in converting mechanical to electrical energy with the help of a magnet, but the material used in making up a moving coil sometimes proves a little bit difficult to identify. It will come as a surprise to many when they find out moving coils are designed using flexible materials, and this material most times could be copper wire.

The copper wire will get wound several times, and the fact that copper supports electromagnetic induction makes it the best option used in making a moving coil. Producing strong signals is what copper is known for, but you should know that properly positioning a moving inside of a microphone is something that needs to be carefully done. We mentioned at the beginning of this post that a moving coil is designed close to the diaphragm’s groove.

This means the moving coil comes in contact with nothing except the microphone’s diaphragm, and you will find the coil suspended right inside of the gap found in a microphone’s capsule. This gap is a ring space with a magnetic structure, and copper wire will still get wound several times despite having a small diameter. This has three benefits and they are;

  • Concentrating on magnetic coils will be easy since its magnetic gap is small
  • Conductivity will be enhanced if the coil has a longer wire length inside of it
  • The presence of more loops inside the coil means an increase in number of conductors with the ability to cut through magnetic fields.

Why Two Wires Are Taken From A Moving Coil

For electromagnetic induction to fully take place, you will need more than a magnetic field and conductive coil. You will need a closed circuit which is filled with lots of wires, and this can be seen in two signal wires that are attached to a dynamic microphone’s moving coil. These wires are attached at each end of the tightly wound copper, before connecting them to transformers to pave way for electromagnetic induction despite the electrical circuit staying closed.

Conclusion – How Does A Moving Coil Microphone Work

This is the point where we have to finish up all we have said about moving coil and dynamic microphones, and we hope that you do not find this post interesting alone but you also find all the answers to your questions. You can tell us what your thoughts and opinions are regarding this post in the comment section.

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