WIRELESS TV HEADPHONE CIRCUIT Project Title Under the Guidance of Submitted by WIRELESS TV HEADPHONE CIRCUIT

ABSTARCT This circuit allows you to watch your favourite TV programmes late at night without disturbing other family members. Most modern TVs are nowadays equipped with audio-in/out and video-in/out RCA sockets. Using an RCA-to-RCA cord, connect the audio output of your TV to the transmitter’s input. Adjust the gain of the audio preamplifier with the help of preset VR1 for clear reception in a portable FM receiver equipped with an earphone socket. This transmitter draws only a few mill amperes of current and doesn’t require on/off switch. It can be fabricated on a small piece of strip board.

PROJECT BLOCK DIAGRAM

HARDWARE COMPONENTS BATTERY RECTIFIER FILTER VOLTAGE REGULATOR TRANSISTOR COIL LED 1N4007 RESISTOR CAPACITOR

BATTERY An electrical battery is a combination of one or more electrochemical cells, used to convert stored chemical energy into electrical energy. The battery has become a common power source for many household, robotics and industrial applications. Larger batteries provide standby power for telephone exchanges or computer data centers

TRANSISTOR The BC547 transistor is an NPN Epitaxial Silicon Transistor. It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA NPN general-purpose transistors. The transistor is a "CURRENT" operated device and that a large current (Ic) flows freely through the device between the collector and the emitter terminals.

BC548 The BC548 transistor is an NPN Epitaxial Silicon Transistor. The BC548 transistor is a general-purpose transistor in small plastic packages. It is used in general-purpose switching and amplification BC848/BC548 series 45 V, 100 mA NPN general-purpose transistors. Whenever base is high, then current starts flowing through base and emitter and after that only current will pass from collector to emitter  

NPN Transistor Configuration PNP Transistor Configuration

COIL

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