Laser Torch

major PROJECT LASER TORCH BASED vocalisation pointter AND RECEIVER CHAPTER -1 INTRODUCTION 1.1 ABOUT PROJECT LASER TORCH-BASED join sender AND RECEIVER Using this racing turn you bum communicate with your neighbors wirelessly. Instead of RF signals, light from a ocular maser torch is used as the carrier in the circuit. The visual maser torch can transmit light up to a distance of about viosterol meters. The photo junction electronic electronic transistor of the receiver must be accurately oriented towards the laser beam from the torch. If there is any(prenominal) obstruction in the cart overlay of the laser beam, no sound will be ascertain from the receiver. The vector circuit comprises condenser microphone transistor amplifier BC548 (T1) followed by an opamp stage built around µA741 (IC1). The gain of the op-amp can be wangleled with the help of 1-mega-ohm pot meter VR1. The AF output from IC1 is coupled to the theme of transistor BD139 (T2), which, in turn, modulates the laser beam. The transmitter uses 9V power supply. However, the 3-volt laser torch (after removal of its battery) can be nowadays inclined to the circuitwith the body of the torch connected to the emitter of BD139 and the spring-loaded forestall up protruding from inside the torch to circuit ground.

The receiver circuit uses an npn phototransistor as the light sensor that is followed by a two-stage transistor preamplifier and LM386-based audio power amplifier. The receiver does non need any manifold alignment. Just keep the phototransistor oriented towards the remote transmitters laser point and adjust the volume control for a clear s! ound. To avoid 50Hz hum noise in the speaker, keep the phototransistor away from AC light sources such as bulbs. The reflected sunlight, however, does non cause any problem. But the sensor should not directly face the sun. DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGG, HARYANA COLLEGE OF TECHNOLOGY AND MANAGEMENT, KAITHAL-136027 1  major PROJECT LASER TORCH BASED VOICE sender AND RECEIVER 1.2 Laser information page 1....If you want to make out a full essay, order it on our website: BestEssayCheap.com

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