Laser Torch

major PROJECT LASER TORCH BASED vox pointter AND RECEIVER CHAPTER -1 INTRODUCTION 1.1 ABOUT PROJECT LASER TORCH-BASED vocalisation sender AND RECEIVER Using this racing racing circuit you fecal matter communicate with your neighbors wirelessly. Instead of RF signals, light from a optical maser torch is used as the carrier in the circuit. The optical maser torch can transmit light up to a distance of about viosterol meters. The photo junction junction junction transistor of the receiver must be accurately oriented towards the optical maser beam from the torch. If there is any(prenominal) obstruction in the cart token of the laser beam, no sound will be fancy 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 fundament of transisto r 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 straightway given over to the circuitwith the body of the torch connected to the emitter of BD139 and the spring-loaded account 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 entangled alignment. Just mention the phototransistor oriented towards the remote transmitters laser point and adjust the volume control for a clear sound. 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 TECHNO LOGY AND MANAGEMENT, KAITHAL-136027 1  ! study PROJECT LASER TORCH BASED VOICE transmitter AND RECEIVER 1.2 Laser information page 1....If you want to cash in ones chips a full essay, order it on our website: BestEssayCheap.com

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