LASER Transmitter/Receiver


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This set of two circuits from the basis for a very simple light wave transmitter. A LASER beam is modulated and then aimed at a receiver that demodulates the signal and then presents the information (voice, data, etc..). The whole thing is very easy to build and requires no specialized parts execpt for the LASER itself. LASERs are available from MWK Industries.

CAUTION:LASER RADIATION CAUTION:LASER RADIATION CAUTION:LASER RADIATION CAUTION:LASER RADIATION

Schematic Of Transmitter

Schematic for LASER transmitter

Schematic Of Receiver

Schematic for LASER receiver

Parts

Part
Total Qty.
Description
Substitutions
C1, C220.1uf Ceramic Disc Capacitor
C31100uf 25V Electrolytic Capacitor
R11100K Ohm 1/4W Resistor
R211M Ohm 1/4W Resistor
R3110K Pot
Q11NPN Phototransistor
U11741 Op Amp
U21LM386 Audio Amp
SPKR118 Ohm Speaker
T118 Ohm:2K Audio Transformer
MISC1Wire, Board, Knob For R3, LASER Tube and Power Supply

Notes

  1. In the transmitter schematic, no ballast resistor is shown because most small LASER power supplies already have one built in. Yours may differ, and a resistor may be needed.
  2. The receiver should be kept away from bright lights. You may want to put a piece of wax paper in front of Q1 to keep the LASER from swamping it.
  3. In order to get any decent amount of modulation, you may need to drive T1 with more then a watt.
  4. The circuit can be made to transmit computer data with the use of two modem chips.

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Comments

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Shahid Manzoor
LASER Transmitter/Receiver
Saturday, November 23, 2013 5:28:33 AM
This is to inform all of you that I already tried this project and i am successful. I have submitted it as my final year University project in which I succered 100% marks. Only few amendment I have made to the both Transmitter & the Receiver circuits. In Transmitter I used 1-Ordinary Laser Pointer instead of Laser Tube and 2-Audio Transformer of 8:1000 Ohms instead of 8:2000 Ohms. And at Receiver Circuit 1-Ordinary LDR instead of NPN Photo transistor. And apply totally two different power sources to the Circuits of TX & RX. If Any Body Needs Help Then Leave A Message For Me In This Regard.
anonymous
LASER Transmitter/Receiver
Monday, August 05, 2013 12:33:37 PM
can u suggest which class laser do i need to use and which is reasonable in cost
zinabu
LASER Transmitter/Receiver
Friday, July 26, 2013 7:28:20 AM
in my receiver part i have got a problem of voltage drop at U2 sorry may you help me to find the solution
Birendra Suwal
LASER Transmitter/Receiver
Thursday, June 07, 2012 8:31:15 AM
i am trying to demonstrate this transmission as my 1st semester project. i build-up the transmitter using 555-timer circuit and receiver as u mentioned but its quite not working. I had used l14f1 qt840 photo-transistor; is it appropriate to use it? what you suggest me to do? i try to get the audio transformer of 8-2000 ohms but i couldn't get it on market which one can replace it?
anonymous
LASER
Tuesday, December 14, 2010 10:26:31 AM
is there a class of laser that is needed? like a minimum of a class BII?
anonymous
LASER Transmitter/Receiver
Friday, August 27, 2010 8:11:38 AM
Hi how can i add a small mic to the transmitter circuit? Thank You
Aon
LASER Transmitter/Receiver
Tuesday, March 02, 2010 7:02:46 AM
i am using the same concept to modulate a red laser at 2.5khz and recieve it 100m with a light sensor to count a hit or a miss.The problem is that it works fine in the dark but with sunlight it doesnt..any idea as to WHY???(is my laser getting saturated(decreased intensity) or is it the noise due to the sunlight?) any ideas on how to solve this problem?? can i get an off-the-shelf laser TX/Rx module that is immune to daylight with 100m range??
s.barthez
LASER Transmitter/Receiver
Sunday, December 13, 2009 3:29:03 PM
i need help for my project. i have two analog signals to send (i must use 2 transmitter device and 1 receiver device : according to the project) so i dont know how can i spread at the end of receiver.
naveen reddy
LASER Transmitter/Receiver
Monday, August 24, 2009 1:08:00 PM
hello sir, could you send the brief explanation on this project,because i was prepare one power point presentation on this topic.
anonymous
LASER Transmitter/Receiver
Monday, August 24, 2009 12:01:46 AM
the circuit its work but if you need some more special aplication so need a more sophisticated circuit . this is a very basic circuit to show how it works the theory . don be ox
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