Electrical Engineering (EE) Exam > Electrical Engineering (EE) Videos > Build the Transmitter - Electrical Engineering
Build the Transmitter - Electrical Engineering Video Lecture - Electrical Engineering (EE)
FAQs on Build the Transmitter - Electrical Engineering Video Lecture - Electrical Engineering (EE)
| 1. What is a transmitter in electrical engineering? |  |
A transmitter in electrical engineering is a device that converts electrical signals into electromagnetic waves, which can then be transmitted through a medium such as air or a cable. It is commonly used in radio and television broadcasting, wireless communication systems, and various other applications that require the transmission of data or information wirelessly.
| 2. How does a transmitter work? | |
A transmitter works by first receiving an electrical input signal, which can be in the form of audio, video, or data. This input signal is then modulated onto a carrier wave, which is a high-frequency electromagnetic wave. The resulting modulated signal is then amplified to a suitable power level and transmitted through an antenna or other means. At the receiving end, a receiver is used to demodulate the signal and extract the original information.
| 3. What are the components of a transmitter? | |
A transmitter typically consists of several key components, including an input source (such as a microphone or data source), a modulator (which modulates the input signal onto a carrier wave), an amplifier (to increase the power of the modulated signal), and an antenna (to radiate the signal into the surrounding space). Additionally, there may be other components such as filters, oscillators, and control circuits to ensure proper operation and signal quality.
| 4. What are the different types of transmitters? | |
There are various types of transmitters used in electrical engineering, depending on the application and technology involved. Some common types include AM (Amplitude Modulation) transmitters, FM (Frequency Modulation) transmitters, and digital transmitters for data communication. Each type has its own characteristics and advantages, making them suitable for different purposes.
| 5. What are some challenges in building a transmitter? | |
Building a transmitter can come with several challenges, such as ensuring the accuracy and stability of the frequency used, minimizing interference with other signals, maintaining signal integrity over long distances, and complying with regulatory requirements for transmission power and frequency usage. Additionally, designing efficient power amplifiers, achieving good modulation accuracy, and optimizing antenna performance are also important considerations in building a transmitter.
Text Transcript from Video
- [Voiceover] Now we have to
build our light transmitter.
It's gonna take the electrical
signal from the radio
and turn it into a time
varying light signal.
So here's the circuit diagram.
We have the radio and it has
two leads coming from it.
And let me show you that.
So here's the radio
and here is, once again,
the mono phono plug.
It's got the one band on it.
It will just work with
anything you plug it into.
So I'll plug that into the radio
and that goes to two leads...
which will connect to
the rest of our circuit.
Now in that circuit there's
going to be a nine volt battery,
which has a positive and a negative side,
and a 470 ohm resistor.
If I don't have that 470 ohm resistor
when I connect the nine volt battery
to my light emitting diode,
the light emitting diode
will burn out instantly
so we need that resistor.
Now, the nine volt battery
snaps into this battery holder.
I use Velcro to hold it
in place on my breadboard.
And the battery holder is color-coded.
The positive terminal of the battery
goes into the red lead
on the battery holder.
So this red lead is the positive terminal
and it goes out and it
connects to one side
of the light emitting diode,
and the black lead goes to the other side
of the light emitting diode.
Now, my switch is simply an alligator clip
that I clipped to a bent paper clip,
and that's how I turn
my light emitting diode on and off.
Now, there's a little bit of a trickiness
about light emitting diodes.
A light emitting diode has two legs to it,
a long leg and a short leg.
And the longer leg must be connected
to the positive terminal of the battery
to make the light emitting diode glow.
So when I mounted my
light emitting diode to my circuit,
I made sure the longer
leg went to the red lead
on the battery.
Now, what's going on
here is that electrons
are actually leaving the
negative terminal of the battery,
going through the black wire,
going to the short lead of
the light emitting diode,
and they come in with the full
nine volts, very high energy,
and they drop their energy
and turn it into light.
And then the electrons with lower energy
continue around back into the battery.
build our light transmitter.
It's gonna take the electrical
signal from the radio
and turn it into a time
varying light signal.
So here's the circuit diagram.
We have the radio and it has
two leads coming from it.
And let me show you that.
So here's the radio
and here is, once again,
the mono phono plug.
It's got the one band on it.
It will just work with
anything you plug it into.
So I'll plug that into the radio
and that goes to two leads...
which will connect to
the rest of our circuit.
Now in that circuit there's
going to be a nine volt battery,
which has a positive and a negative side,
and a 470 ohm resistor.
If I don't have that 470 ohm resistor
when I connect the nine volt battery
to my light emitting diode,
the light emitting diode
will burn out instantly
so we need that resistor.
Now, the nine volt battery
snaps into this battery holder.
I use Velcro to hold it
in place on my breadboard.
And the battery holder is color-coded.
The positive terminal of the battery
goes into the red lead
on the battery holder.
So this red lead is the positive terminal
and it goes out and it
connects to one side
of the light emitting diode,
and the black lead goes to the other side
of the light emitting diode.
Now, my switch is simply an alligator clip
that I clipped to a bent paper clip,
and that's how I turn
my light emitting diode on and off.
Now, there's a little bit of a trickiness
about light emitting diodes.
A light emitting diode has two legs to it,
a long leg and a short leg.
And the longer leg must be connected
to the positive terminal of the battery
to make the light emitting diode glow.
So when I mounted my
light emitting diode to my circuit,
I made sure the longer
leg went to the red lead
on the battery.
Now, what's going on
here is that electrons
are actually leaving the
negative terminal of the battery,
going through the black wire,
going to the short lead of
the light emitting diode,
and they come in with the full
nine volts, very high energy,
and they drop their energy
and turn it into light.
And then the electrons with lower energy
continue around back into the battery.
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Nov 08, 2024 Last updated |
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