LASER COMMUNICATION

PRINCIPLE:

 

Laser communication is a wireless communication. This type of communication is an advanced version of the fiber optic communication.

My circuit replaces the existing fiber optic cables by a wireless means.

CIRCUIT DESCRIPTION:

The voice signal begins as a sound wave. It is converted to electrical signal by means of a electric microphone in the transmitting circuit. This signal is amplified by means of LM358 audio amplifier and converted into a optical signal by switching the voltage to the laser source via a signal transistor. This optical signal is focused on the phototransistor in the receiver end.

At the receiver end the optical signals from the laser source is sensed by the phototransistor which converts it into an electrical signal again. This signal is amplified and fed into a speaker where it becomes a sound wave. A voltage regulator has been used in the circuit to overcome the feedback in the circuit

COMPONENTS REQUIRED:

100R (brown, black, brown)

 1K (brown, black, red)

10K (brown, black, orange)

22K (red, red, orange)

100K (brown, black, yellow) 

220K (red, red, yellow)

680K (blue, grey, yellow)

1M (brown, black, green)

100K Koa trim pot (104)

Capacitors:

10 uF electrolytic

100 uF electrolytic 

0.1 uF mono block (104)

10nF Mylar (103)

Fiber optic cable1

Speaker 8 ohm, 1/2W

78L05 regulator

BC547 transistor

 IF-D93 detector - red dot on black case

IF-E96 emitter - pink dot on blue case

Elect ret microphone

9V battery snap

 Nut & bolt set

LM358 IC

LM386 IC

8 pin IC sockets

Kit 26 Receiver PCB

Kit 26 Transmitter PCB

2 pole terminal block