LASER TRANSMITTER PLUS RECEIVER
TRANSMITTER
Transmitter is a laser tube connected to high voltage supply.The message to be transmitted is
supplied to Audio in side with resistance of the coil 8ohm.The other side coil has resistance
2000ohm.
When audio signal is given to the coil it modulates the high voltage supply and lazer tube will
emit laser light in proportional to the sound signal
RECEIVER
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The receiver consists of 741 Op Amp , LM386 Audio Amp , NPN Phototransistor.
When modulated lazer beam strikes phototransistor it gets biased and corresponding electric
signal will generate.This will gets amplified by Opamp and gives the output to audio amplifier
and then to the speaker.
Parts are
C1, C2 2 0.1uf Ceramic Disc Capacitor
C3 1 100uf 25V Electrolytic Capacitor
U1174 1 Op Amp
U2 1 LM386 Audio Amp
SPKR 1 18 Ohm Speaker
T1 1 8Ohm: 2K Audio Transformer
R1 1 100K Ohm 1/4W Resistor
R2 1 1M Ohm 1/4W Resistor
R3 1 10K Potentiometer
Q1 1 NPN Phototransistor
MISC 1 Wire, Board, Knob For R3, LASER Tube and Power Supply
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