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.
Receiver:
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.
| Symbol | Quantity | Description | Value |
| C1, C2 | 2 | Ceramic Disc Capacitor | 0.1uf |
| C3 | 1 | Electrolytic Capacitor | 100uf 25V |
| U1174 | 1 | Op Amp | |
| U2 | 1 | Audio Amp | LM386 |
| SPKR | 1 | Speaker | 18 Ohm |
| T1 | 1 | Audio Transformer | 8Ohm: 2K |
| R1 | 1 | Resistor | 100K Ohm 1/4W |
| R2 | 1 | Resistor | 1M Ohm 1/4W |
| R3 | 1 | Potentiometer | 10K |
| Q1 | 1 | NPN Phototransistor | |
| MISC | 1 | Wire, Board, Knob For R3, LASER Tube and Power Supply | |
That's It.
