LASER Transmitter/Receiver
The described light wave transmitter system consists of two primary components: the transmitter circuit and the receiver circuit. The transmitter circuit utilizes a laser diode, which serves as the light source. The modulation of the laser beam can be achieved through various methods, such as pulse-width modulation (PWM) or amplitude modulation (AM), depending on the type of information being transmitted.
In the case of voice or audio data, the input signal is typically fed into a modulator circuit that adjusts the intensity of the laser beam in accordance with the audio waveform. This modulated light is then directed towards the receiver circuit, which is designed to detect and demodulate the incoming laser signal. The receiver usually consists of a photodiode or phototransistor, which converts the light signal back into an electrical signal.
The demodulation process may involve additional circuitry, such as an amplifier and a low-pass filter, to reconstruct the original audio or data signal from the modulated light. The output can then be connected to an audio output device or a data processing unit, depending on the application.
It is essential to ensure that the laser power supply used is compatible with the laser diode specifications. If a ballast resistor is not integrated into the power supply, it must be added externally to prevent damage to the laser diode due to excessive current. Proper thermal management should also be considered, as laser diodes can generate significant heat during operation, which may affect performance and longevity.
Overall, this simple light wave transmitter system provides a fundamental approach to wireless communication using modulated light, making it suitable for a variety of applications, including remote audio transmission, data link setups, and educational projects in optics and electronics.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 MW K Industries. 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. 🔗 External reference
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