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Music Transmission and reception with high S/N ratio using
fiber optic communication
Technical Specifications:
Title of the project
Music Transmission and reception with high S/N ratio
using fiber optic communication
Optical Communication Systems Design
Power Supply
+5V, 500mA Regulated Power Supply
Telecommunications, Fiber optics, wireless music system
Developed By
M/S Wine Yard Technologies
040- 6464 6363,
Fiber Optics is the technique of transmitting light through transparent, flexible fibers of
glass or plastic. An optical fiber acts as a waveguide, or "light pipe", to transmit light between
the two ends of the fiber. The field of applied science and engineering concerned with the design
and application of optical fibers is known as fiber optics. Optical fibers are widely used in fiberoptic
higher bandwidths (data rates) than other forms of communication
By using this project audio musical notes can be generated and heard up using fiber optic
communication through optical cable. The circuit can be divided into two parts: transmitter and
receiver. The music transmitter works for a 9V battery, while the music receiver works for
regulated 9V to 12V. The transmitter uses popular melody generator IC UM66 that can
continuously generate musical tones. The output of this music melody generator is fed to the
driver stage to get the maximum range.
An LED is connected in the Transmitter section. This LED flickers according to the
musical tones generated by UM66 IC, indicating modulation. Two LEDs are connected in series.
For maximum sound transmission these should be oriented towards IR phototransistor L14F1.
The music receiver uses popular op-amp IC μA741 and audio-frequency amplifier IC LM386
along with phototransistor L14F1 and some discrete components. The melody generated by IC
UM66 is transmitted through IR LEDs, received by phototransistor and fed to pin 2 of IC μA741.
Its gain can be varied using potentiometer VR1. The output of IC μA741 is fed to IC LM386 via
capacitor C5 and potentiometer. The melody produced is heard through the receiver’s
loudspeaker. Potentiometer VR2 is used to control the volume of loudspeaker (8-ohm, 1W).
Switching off the power supply stops melody generation.
This project uses regulated 5V, 500mA power supply. 7805 three terminal voltage regulator is
used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of
secondary of 230/12V step down transformer.
Block Diagram: Music Transmission using Fiber Optic communication