IR-BASED VOICE TRANSMITTER AND RECEIVER


INTRODUCTION:

IR-BASED VOICE TRANSMITTER AND RECEIVER, the aim of the project is to communicate wirelessly. In this project we are using various transistors, LED, op-amp etc. and we made a detailed study on this so as to effectively use them in our project.

1.1 OBJECTIVE OF THE PROJECT: -
The aim of the project is to communicate between any 2 distant places wirelessly which are at a distance of 5meters apart. The distance can be improve ....etc

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CONTENTS

1. INTRODUCTION……………..……………………………………………………. 2
2. BLOCK DIAGRAM………………………………………………………………… 4
3. BLOCK DESCRIPTION…….……………………………………………………...5
4. THEORY & PRINCIPLE OF OPERATION…. ………………………………….6
5. CIRCUIT DIAGRAM………..……………………………………………………. 8
6. CIRCUIT DESCRIPTION……� ....etc

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CONTENTS

1. INTRODUCTION……………..……………………………………………………. 2
2. BLOCK DIAGRAM………………………………………………………………… 4
3. BLOCK DESCRIPTION…….……………………………………………………...5
4. THEORY & PRINCIPLE OF OPERATION…. ………………………………….6
5. CIRCUIT DIAGRAM………..……………………………………………………. 8
6. CIRCUIT DESCRIPTION…… ....etc

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Please give me the answer for construction and working of photo transistor and its features
....etc

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advantage and disadvantages of phototransistor pdf ....etc

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PHOTOTRANSISTOR A LEAP OF OPTOELECTRONICS

Like diodes, all transistors are light-sensitive. Phototransistors are designed specifically to take advantage of this fact .the most-common variant is an NPN bipolar transistor with an exposed base region. Here, light striking the base Replaces what would ordinarily be voltage applied to the base “ so, a photo- transistor amplifies variations in the light striking it. Phototransistors may or may not have a base lead . (if they do, the base lead allows us to bias the phototransis ....etc

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LASER TORCH BASED VOICE TRANSMITTER AND RECEIVER
Using this circuit you can communicate with your neighbors wirelessly. Instead of RF signals, light from a laser torch is used as the carrier in the circuit. The laser torch can transmit light up to a distance of about 500 meters. The phototransistor of the receiver must be accurately oriented towards the laser beam from the torch. If there is any obstruction in the path of the laser beam, no sound will be heard from the receiver. The transmitter circuit (Fig. 1) comprises c ....etc

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advantage and disadvantages of phototransistor pdf ....etc

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WIRELESS SWITCH

Normally, home appliances are
controlled by means of switches,
sensors, etc. However,
physical contact with switches may be
dangerous if there is any shorting.
The circuit described here requires
no physical contact for operating the
appliance. You just need to move
your hand between the infrared LED
(IR LED1) and the phototransistor
(T1). The infrared rays transmitted by
IR LED1 is detected by the phototransistor
to activate the hidden lock, flush
system, hand dryer or else.
This circuit is very s ....etc

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PHOTOTRANSISTOR A LEAP OF OPTOELECTRONICS

Like diodes, all transistors are light-sensitive. Phototransistors are designed specifically to take advantage of this fact .the most-common variant is an NPN bipolar transistor with an exposed base region. Here, light striking the base Replaces what would ordinarily be voltage applied to the base “ so, a photo- transistor amplifies variations in the light striking it. Phototransistors may or may not have a base lead . (if they do, the base lead allows us to bias the phototransis ....etc

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Abstract—A fundamental question in multihop wireless network protocol design is how to partition the network's transport capacity among contending flows. A classically “fair” allocation leads to poor throughput performance for all flows because connections that traverse a large number of hops (i.e., long connections) consume a disproportionate share of resources. However, naïvely biasing against longer connections can lead to poor network utilization, because a significantly high fraction of total connections are long in large networks w ....etc

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Normally, home appliances are controlled by means of switches, sensors, etc. However, physical contact with switches may be dangerous if there is any shorting. The circuit described here requires no physical contact for operating the appliance. You just need to move your hand between the infrared LED (IR LED1) and the phototransistor (T1). The infrared rays transmitted by IR LED1 is detected by the phototransistor to activate the hidden lock, flush system, hand dryer or else. This circuit is very stable and sensitive compared to other AC appli ....etc

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Suggest correct circuit
How to construct the circuit with l14f1 so that iT operate as switch ....etc

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plz send me the abstract for wireless switch in efy magazine using op amp and phototransistor? ....etc

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LASER TORCH BASED VOICE TRANSMITTER AND RECEIVER
Using this circuit you can communicate with your neighbors wirelessly. Instead of RF signals, light from a laser torch is used as the carrier in the circuit. The laser torch can transmit light up to a distance of about 500 meters. The phototransistor of the receiver must be accurately oriented towards the laser beam from the torch. If there is any obstruction in the path of the laser beam, no sound will be heard from the receiver. The transmitter circuit (Fig. 1) comprises c ....etc

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