TV Transmitter Circuit

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TV Transmitter Circuit

SKU: TV Transmitter Circuit Categories: ,

Description

TV Transmitter Circuit

Introduction

         Audio and Video signals are amplified by the simple circuits,. These are transmitted by the Very high frequency bands.

Princilple

Audio signals are frequency modulated and video signals are PAL modulated. These modulated signals are applied for the antenna.

Circuit design

  • The audio signal is applied to the base of the transistor through a resistor and capacitor of 10Kohms and 10uf respectively. Emitter of the transistor is connected to the radio frequency transformer. The audio signal here is pre-amplified by the transistor.
  • Radio frequency transformers are used for maximum power transfer. They have two windings Primary and secondary. The voltage is applied at the primary winding and due to mutual inductance some voltage is induced in the secondary winding of the transformer. Hence voltage can be transferred from one circuit to another circuit. Here in this circuit, a transformer with an inbuilt capacitor is used.
  • Signal diode is a diode which allows the current to flow only in one direction. They pass small currents upto 100mA and process the information in the electrical signals. They are used widely in signal processing. Here signal diode is used for video modulation.
  • The audio input is connected to the base of the transistor through a resistor and capacitor in series. A  LC tank circuit is connected to the collector terminal of the transistor .This tank circuit produces the carrier frequency for modulation .The tank circuit consists of a variable capacitor and a resistor in parallel.
  • Video input signal is applied to the transistor through the variable resistor of 1kohms. It is fed to the pot through a capacitor of 0.1uf and a signal diode in parallel to it.
  • The modulated signals are fed to the antenna. Antenna is required to transmit the signal. Antenna takes the electrical signal and converts them into an electromagnetic radiation. This radiation is emitted by the antenna.

Applications

  • broadcasting applications.
  • transmit audio and video signals from DVD, videogames, etc.
  • surveillance cameras.

Additional information

Weight 1.000000 kg

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