DESIGN, CONSTRUCTION AND TESTING OF LASER TORCH-BASED VOICE TRASNSMITTER AND RECEIVER
No Thumbnail Available
Date
2010-11-30
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Nuhu Bamalli Polytechnic Zaria
Abstract
This project present the design and construction of laser torch based voice transmitter and receiver is aim at providing a means of communication between two people located within the same area not more than 50 meters. The transmitter section is designed using a condenser microphone, which detect the voice and convert it into an electrical signal. The output of the microphone is given first amplification by driver transistor T1 and it output is modulated by an oscillator signal design using a comparator IC. The modulated output is further amplified by a power transistor T2 and the signal is transmitted inform of light by a laser torch. The receiver circuit on the other hand, a phototransistor T3 which received the light transmitted by the laser torch, and changes it back to electrical signal. The signal is demodulated by a demodulator build around transistor T4 and T5. The demodulated signal is amplified by an audio amplifier IC LM 386 and finally the output is taken by the speaker.