Contents
What are the components of an FM transmitter?
From the block diagram, the FM transmitter circuit consists of the following components:
- Micro-phone.
- Audio pre-amplifier.
- RF oscillator.
- Amplification stage.
- Antenna.
What causes static on FM transmitter?
If the audio you feed into your FM transmitter is too low, you’ll hear a lot of static because there is always some static in the background, and you have to turn the sound up a TON to get your music feed.
How does a FM transmitter circuit work?
The FM transmitter is a circuit that uses a very low power to operate and does uses (Frequency Modulation) FM Waves to transmit the sound. With the help of such FM transmitters we can easily transmit the audio signals through the carrier waves with different frequencies.
Why do we use feedback in FM transmitters?
The feedback signal makes the base-emitter current of the transistor vary at the resonant frequency. This causes the emitter-collector current to vary at the same frequency. This signal fed to the aerial and radiated as radio waves.
What are the main features of transmitter?
What are the main features of a transmitter? Explanation: Some of the main features which make the transmitter complex are higher clock speed, higher transmit power, directional antennas and need for a linear amplifier.
What are the two methods of FM generation?
Methods of FM Generation.
What is the function of transmitter?
The transmitter combines the information signal to be carried with the radio frequency signal which generates the radio waves, which is called the carrier signal. This process is called modulation. The information can be added to the carrier in several different ways, in different types of transmitters.
What is the basic principle of FM generation?
The basic principle behind FM is that the amplitude of an analog baseband signal can be represented by a slightly different frequency of the carrier. We represent this relationship in the graph below.
What kind of capacitor does a FM transmitter need?
The 74LS138 along with 22pF capacitor acts as a Tank circuit which produces a strong carrier frequency and modulate it with our amplified audio signal. We do not have a RF-Amplifier in our circuit, but it can be added if you need to achieve a higher range. The Circuit Diagram of this Simple FM Transmitter is shown in the image below.
What kind of inductor does an FM transmitter need?
The circuit uses an LM386 Audio amplifier which acts as an Pre-Amplifier, this IC amplified the audio signals from the audio device and feeds it to the Oscillating circuit. The Oscillating circuit should have an Inductor and a Capacitor.
How is FM transmission done in a circuit?
FM Transmitter Circuit Principle: FM transmission is done by the process of audio pre amplification, modulation and then transmission. Here we have adapted the same formula by first amplifying the audio signal, generating a carrier signal using an oscillating and then modulating the carrier signal with the amplified audio signal.
Why is an oscillator needed in a FM transmitter?
The oscillator is required in FM Transmitter Circuit in order to generate the radio frequency carrier waves. The transmitter circuit is capable of storing the energy for the oscillation as it is a derived from the (inductor and capacitor) LC circuits.