This is a simple Laser communication system. It can transmit and receive signal from any audio device.Communication distance is few meters. All components are not critical.
This is a simple communication system that transmits data using laser beam. Transmitter output is a laser diode which transmits a signal to a photo transistor in the receiver. Laser diode is best taken from a laser pointer costing around 20kn.
Transistors Q6 and Q7 signal amplifier consists of photo transistor. The transistor Q6 is necessary to put a small refrigerator. Components are not critical.
