Instead of RF signals, light from a laser torch is used as the carrier in a circuit. A laser torch can transmit light up to a distance of about metres. 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. The gain of the op-amp can be controlled with the help of 1-mega-ohm potmeter VR1.
|Published (Last):||24 March 2010|
|PDF File Size:||12.14 Mb|
|ePub File Size:||10.73 Mb|
|Price:||Free* [*Free Regsitration Required]|
Instead of RF signals, light from a laser torch is used as the carrier in a circuit. A laser torch can transmit light up to a distance of about metres. 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. The gain of the op-amp can be controlled with the help of 1-mega-ohm potmeter VR1. The transmitter uses 9V power supply. However, the 3-volt laser torch after removal of its battery can be directly connected to the circuit—with the body of the torch connected to the emitter of BD and the spring-loaded lead protruding from inside the torch to circuit ground. T3 is a photo sensitive transistor which receives the laser from the LED transmitter.
The transistor puts out a signal that is proportional to the light from the LED. This not only receives the signal it also demodulates it. C5 couples this audio to T4 and T5 which amplify the signal.
The signal is them coupled through C8 to VR2. VR2 is a volume control for IC2. IC2 amplifies the signal more and drives the speaker, LS1. To avoid 50Hz hum noise in the speaker, keep the photo-transistor away from AC light sources such as bulbs. The reflected sunlight, however, does not cause any problem. But the sensor should not directly face the sun. I have made this circuit but all I can observe is a noise at the receiver speaker. I am using a laser torch and when it is pointed to the base terminal of the 2n photo transistor a sound can be heard.
Other than this I am not even sure whether the mic is peaking up the sound or the transmission is happening or the receiver is working properly. I am using a condenser mic. Please reply me soon…. Yes, you may get some noise in the receiver. To minimise the noise please follow the instructions given in the article. Query is not clear. Feed audio signal into transmitter side. Transmit the audio signal wirelessly using Laser torch.
You should get the same audio signal at the output of the receiver side. This circuit works perfectly with all the components as specified. But I wish to know more about its design and concepts. Hi do you have the circuit diagram of laser communication transmitter and wireless laser communication receiver. Can we connect the output directly to the speaker without using the lm ic?? May i know whether this circuit will work for underwater application to be testeed in an underwater tank of length 2 m.
If yes what may be the expected distance it can communicate. If i want to design for the underwater application will there be any change i may have to make wrt the circuit and type of laser. I had the subscription of the EFY magazine in I remember seeing this project around mid in the print version. There was no internet back then. This was one of the ideas that blew my mind. I was in 12th and tried to attempt this for my 12th Vocational electronics final year project.
Since this circuit was not elaborately explained like every other project, my teammates warned me against wasting my time in this one. However, the fascination with this idea compelled me to hunt for the components and put the circuit together.
In one attempt, I was able to transmit a crisp voice meters away along the corridor of my electronics laboratory Focussed the beam on the receiver using a lens. The received voice was so clear that one could identify who the transmitter was on the other end. I am truly thankful to EFY for shaping my childhood. Sign in Join. Sign in.
Log into your account. Sign up. Password recovery. Friday, June 5, Advertise Contact About Magazine. Forgot your password? Get help. Create an account. Electronics For You. The mic is the audio input. Electronics Projects: Four Frequencies Generator. Simple Interface for Digital Sound Synthesis. Pls reply…Can I use an audio jack instead of condenser mic in transmitter circuit..?
My transmitter laser torch not glow what is the fault…? Please tell me…. Is there any specification for the condenser mic used…please reply soon.
The circuit works perfectly. Thank You Niraj for your valuable feedback and keep up the good work. Please enter your comment! Please enter your name here. You have entered an incorrect email address! IOT Zone. Popular circuits! LM Audio Amplifier. Micro Inverter. Make This Joystick-Controlled Robot. Wireless Gate Alarm.
Graduate Engineer Trainees 4 June Associate Software Engineer 4 June Release Engineer 4 June In analogue electronics, oscillators and their implementation using integrated circuits ICs is an important subject. As Read more.
Sorting fruit one-by-one using hands is one of the most tiring jobs. It requires lots of effort Professional Electronics Design. Testing Times. All Time Fav Videos! What is an MCB? How To: Constructing an Inverter. Profit from Tech. Electric Bikes Changing Perceptions 4 September Industry Talk. Career advice and jobs related to electronics and IOT. A resource for professional design engineers.
Project Report on Laser Torch Based Voice Transmitter and Receiver
Laser Torch based Voice Transmitter and Receiver
Right from the origin communication system had undergone several changes in terms of its advancement, continuous modernization taking place in every aspect of global communication. This electronic media starting from satellite communications had invented new dimensions in the field of wireless communication, research in these areas created a new concept of communication by means of lasers, no one ever expected this kind of development in communication strategies and its always a raising question that how we communicate by implementing lasers, in our project we give a detailed answer about how we communicate with others by using laser technology. The main operation of our project is based on the two sections one is laser transmitter section and the other laser receiver section the combination of these two sections constitutes the entire circuit block. The proposed circuit basically had the transmitter circuit and this block consists of transistor amplifier BC coupled with condenser microphone, and an audio modulator BD And the total components with their specifications are elaborately explained in this paper.
Laser Based Transmitter And Receiver