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LASER Transmitter/Receiver

Source: http://www.aaroncake.net/

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

Schematic Of Transmitter


Schematic for LASER transmitter

 

Schematic Of Receiver


Schematic for LASER receiver

Parts:


Part

Total Qty.

Description

Substitutions

C1, C2

2

0.1uf Ceramic Disc Capacitor

C3

1

100uf 25V Electrolytic Capacitor

R1

1

100K Ohm 1/4W Resistor

R2

1

1M Ohm 1/4W Resistor

R3

1

10K Pot

Q1

1

NPN Phototransistor

U1

1

741 Op Amp

U2

1

LM386 Audio Amp

SPKR1

1

8 Ohm Speaker

T1

1

8 Ohm:2K Audio Transformer

MISC

1

Wire, 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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