**The Transformer: A Device with a Hidden Talent**

Did you know that in over 90% of the cases when you use an electrical device, you always use a transformer? They all have different shapes and sizes, but what they mostly do in your device is stepping down a high sine voltage like your mains voltage into a smaller sine voltage. This way, your device can create a stable DC voltage by rectifying it.

Aside from this awesome function, it also creates some loss during the transformation, which might be a bit too much to explain right now. But there's one unwanted effect that you can clearly hear when there's a big load attached or even a short-circuit – in my case, it is called 50 Hertz hum and it is referral to the frequency of our mains voltage.

Now the question is: do other frequencies work as well or even music? So, in this video, I will find out whether such a transformer can be used just like a speaker. Let's get started!

**The Experiment Begins**

I started off with the E and I section of the iron core of an old high voltage transformer that I want salvaged from a microwave. Then, I grabbed some 0.65 millimeter and 0.5 millimeter enamel copper wire which we at least withstand three amps for the thicker one and two amps for the pinna one.

I used three folding rulers and a small water level to create a similar shape like the middle section of my iron core. Now, I can start the Superfund port, which means creating two coils with 100 windings each and one with 250 windings just to have a bit of variation for later.

Let's start with 250 windings as the primary coil and 100 windings as the secondary coil. It's also very important to create a completely closed iron core to enhance the magnetic flux, which increases the see and power limitations. If I use a 25 volt peak sine wave as an input, we get around 10 volts at the outputs. So, it works as a transformer, and that's expected – the 50 Hertz hum still exists.

**Where Does the Hum Come From?**

If we take a closer look at the iron, then we see that it is not a solid material; it is made of slices which are isolated to each other to decrease eddy currents. For better understanding, let's firstly find out how normal speaker works.

We can see that there is a coil which moves a former back and forth due to the polarity changes of the magnetic fields which it creates in the middle of magnets. This moves the cone in the frequency of the input signal and creates the healable sound. And our transformer is kind of the same – the coils also create a changing magnetic field, but here the magnetic forces on the iron let's the slices vibrate.

This is due to the air gaps between them and the relative air gaps between the E and I section of my core. If we would build up the amplifier that I made for a previous video, then we could easily drive the speaker with it. But a transformer is a way bigger inductive load and needs a bit rougher treatment.

**The Output**

I went with the simple but quality lacking and channel MOSFET with a big heat sink as an output stage. If I hook up my frequency generator to its, then we can see that it actually works for frequencies higher than 50 Hertz.

Now, it's time for the final experiments – I hooked up my music player, crossed both fingers, and it did work! It actually is the loudest with no load attached to the secondary sides. By using a coil with less windings, I also moved the I section on a bit around to create all kinds of different sound patterns but just listen for bits.

It may not be a useful speaker, but it's definitely a lot of fun to play with and we learned a bit about transformer!

WEBVTTKind: captionsLanguage: endid you know that in over 90% of the cases when you use an electrical device you always use a transformer they all have different shapes and sizes but what they mostly do in your device is stepping down a high sine voltage like your mains voltage into a smaller sine voltage this way your device can create a stable DC voltage by rectifying it aside from this awesome function it also creates some loss during the transformation which might be a bit too much to explain right now but there's one unwanted effect which you can clearly hear when there's a big load attached or even a short-circuit in my case it is called 50 Hertz hum and it is referral to the frequency of our mains voltage now the question is do other frequencies work as well or even music so in this video I will find out whether such a transformer can be used just like a speaker let's get started I started off with this e and I section of the iron core of an old high voltage transformer that I want salvaged from a microwave then I grabbed some 0.65 millimeter and 0.5 millimeter enamel copper wire which we at least withstand three amps for the thicker one and two amps for the pinna one I use three folding ruler and a small water level to create a similar shape like the middle section of my iron core and now I can start the Superfund port which means I created two coils with 100 windings each and one with 250 windings just to have a bit of variation for later let's start with 250 windings as the primary coil and 100 windings as the secondary coil it's also very important to create a completely closed iron core to enhance the magnetic flux which increases the see and power limitations if I use a 25 volt peak sine wave as an inputs we get around 10 volts at the outputs so it works as a transformer and that expected the 50 Hertz hum still exists so where does it come from if we take a closer look at the iron then we see that it is not a solid material it is made of slices which are isolated to each other to decrease eddy currents and for better understanding let's firstly find out how normal speaker works we can see that there is a coil which moves a former back and forth due to the polarity changes of the magnetic fields which it creates in the middle of magnets this moves the cone in the frequency of the input signal and creates the healable sound and our transformer is kind of the same the coils also create a changing magnetic fields but here the magnetic forces on the iron let's the slices vibrate this is due to the air gaps between them and the relative air gaps between the E and I section of my core if we would build up the amplifier that I made for a previous video then we could easily drive the speaker with it but a transformer is a way bigger inductive load and needs a bit rougher treatment I went with the simple but quality lacking and channel MOSFET with a big heat sink as an output stage if I hook up my frequency generator to its then we can see that it actually works for frequencies higher than 50 Hertz now it's time for the final experiments I hooked up my music player crossed both fingers and it did work it actually is the loudest with no load attached to the secondary sides and by using a coil with less windings I also moved the I section on a bit around to create all kinds of different sound patterns but just listen for bits it may not be a useful speaker but it's definitely a lot of fun to play with and we learned a bit about transformerdid you know that in over 90% of the cases when you use an electrical device you always use a transformer they all have different shapes and sizes but what they mostly do in your device is stepping down a high sine voltage like your mains voltage into a smaller sine voltage this way your device can create a stable DC voltage by rectifying it aside from this awesome function it also creates some loss during the transformation which might be a bit too much to explain right now but there's one unwanted effect which you can clearly hear when there's a big load attached or even a short-circuit in my case it is called 50 Hertz hum and it is referral to the frequency of our mains voltage now the question is do other frequencies work as well or even music so in this video I will find out whether such a transformer can be used just like a speaker let's get started I started off with this e and I section of the iron core of an old high voltage transformer that I want salvaged from a microwave then I grabbed some 0.65 millimeter and 0.5 millimeter enamel copper wire which we at least withstand three amps for the thicker one and two amps for the pinna one I use three folding ruler and a small water level to create a similar shape like the middle section of my iron core and now I can start the Superfund port which means I created two coils with 100 windings each and one with 250 windings just to have a bit of variation for later let's start with 250 windings as the primary coil and 100 windings as the secondary coil it's also very important to create a completely closed iron core to enhance the magnetic flux which increases the see and power limitations if I use a 25 volt peak sine wave as an inputs we get around 10 volts at the outputs so it works as a transformer and that expected the 50 Hertz hum still exists so where does it come from if we take a closer look at the iron then we see that it is not a solid material it is made of slices which are isolated to each other to decrease eddy currents and for better understanding let's firstly find out how normal speaker works we can see that there is a coil which moves a former back and forth due to the polarity changes of the magnetic fields which it creates in the middle of magnets this moves the cone in the frequency of the input signal and creates the healable sound and our transformer is kind of the same the coils also create a changing magnetic fields but here the magnetic forces on the iron let's the slices vibrate this is due to the air gaps between them and the relative air gaps between the E and I section of my core if we would build up the amplifier that I made for a previous video then we could easily drive the speaker with it but a transformer is a way bigger inductive load and needs a bit rougher treatment I went with the simple but quality lacking and channel MOSFET with a big heat sink as an output stage if I hook up my frequency generator to its then we can see that it actually works for frequencies higher than 50 Hertz now it's time for the final experiments I hooked up my music player crossed both fingers and it did work it actually is the loudest with no load attached to the secondary sides and by using a coil with less windings I also moved the I section on a bit around to create all kinds of different sound patterns but just listen for bits it may not be a useful speaker but it's definitely a lot of fun to play with and we learned a bit about transformer