Thus, efforts to directly modulate a laser with an analog signal are usually unsatisfactory. Too little current and the diode refuses to "lase". Lasers are inherently non-linear devices laser diodes happily operate only in a narrow range of drive currents. The system has been successfully demonstrated to a distance of 6.5 miles (10.5km). The high-fidelity circuits employ a cheap laser pointer as the light source and a readily available photodiode as the detector.
If you'd like to experiment with point-to-point (free-space, without a glass fiber) light-beam voice or other audio communications, or with music transmission (say, to a remote clandestine radio transmitter), these circuits might be of interest to you. Laser Pointer Audio Modulator - Laser Beam Detector/Demodulatorįind on this page | Range Calculator/Estimator High Fidelity Laser Pointer Audio Modulator - Laser Beam Detector/Demodulator Modulate a cheap laser pointer with voice or music.
0 kommentar(er)
