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

anonymous
LASER Transmitter/Receiver
Thursday, May 08, 2008 3:19:12 AM
Can someone please tell me how do a laser torch - based voice transmitter and receiver works ?
Mick
LASER Transmitter/Receiver
Wednesday, May 07, 2008 11:53:37 PM
What is it with all these students that don't know shit about electronics. If you can't figure out how to transmit data with this schematic so nicely laid out for you then maybe you shouldn't be playing with lasers.
john paul rairata
LASER Transmitter/Receiver
Sunday, May 04, 2008 8:23:12 AM
thank you for simple diagram...i want to use this to trnsmit data to my com.........how it work? and what are 2 modem chips thnks again
anonymous
LASER Transmitter/Receiver
Monday, April 28, 2008 5:41:04 PM
Replace the laser they show with a laser pointer. Oh, and if you simply hook it up to a headphone jack you eliminate the need for a speaker as well,as a pair of headphones will act the same. As shown, this mother is costing about $400-$500 scitoys.com has a better explaination

(Editor's notes: $400-$500?)

anonymous
LASER Transmitter/Receiver
Thursday, April 17, 2008 8:42:37 PM
how close are to today's light transmitters and receivers to those conceived by Feynman almost 50 years ago???
anu.c.j
LASER Transmitter/Receiver
Saturday, March 15, 2008 6:57:45 AM
i am very happy in this moment.because i want to make a laser project.this circuit is suitable for these project.thank you
Ross
LASER Transmitter/Receiver
Saturday, February 23, 2008 6:25:30 AM
this might be the thing that i need. Unless it is an amplitude modulation circuit. pls send and email to me if you have any idea on how to construct a laser FM audio circuit. thanks. btw, i am a Computer systems Engineering student in De La Salle University Manila.
v.vinoth
LASER Transmitter/Receiver
Thursday, February 21, 2008 5:22:46 AM
respeted sir, you didn't give any detailed about laser beam on your text and how it will work?
anonymous
LASER Transmitter/Receiver
Tuesday, February 12, 2008 10:14:25 AM
please, would u suggest what are the applications and advantages of this?
pkumar
LASER Transmitter/Receiver
Sunday, January 20, 2008 1:35:09 AM
hai sir i am pkumar, please would you give brief description about this circuit.Has like to do seminar on this project.
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