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Light Beam Communications Circuits
Freespace Circuits:  #'s - K         L - Z 
 

Last Updated: October 24, 2017 02:54 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Circuits Designed by Dave Johnson, P.E. :

Laser Communication SystE - M -  This laser communication system transmits sound or music signals through a laser beam.  The intensity of the laser beam changes with the amplitude of the sound signal.  The variation in the...___ Electronics Projects for You

Laser Communication SystE - M -  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.  Transistor 2N2222 may be on the coolrib.  Laser diode is from laser pointer.   __ Designed by Keith Carter, Michael Muccio

Laser Light Detyector-10Mhz to 20Mhz -  This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system.  It has good ambient light immunity . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Light Detector with High Ambient Light Immunity -  This circuit is designed for detecting infrared light modulated at around 40KHz.  Itís feedback scheme cancels much of the DC component from ambient light.  Itís conversion factor is about 100 millivolts per microwatt of 900nm light.. . . Circuit by David Johnson P.E.-July, 2006

Light Detectors with Ambient Light Compensation -  These circuits were taken from a few application notes on infrared remote control devices.  They use a current compensation method to separate the modulated light pulses from ambient light.  They appear to have limited bandwidth and may only work at the 30K. . . Circuit by David A. Johnson P.E.-July, 2000

Light Receiver 30Khz Amp -  This circuit uses NPN darlington transistor to amplify the signal produced from short light flashes, as detected by a PIN photo diode.  The circuit draws only about 330uA from a 6v battery . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002

Light Receiver-10MHz to 20MHz -  Light power to volts conversion = APPROX.15mV per microwatt at 850nM . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Light to Frequency Converter -  This circuit uses a CMOS version of the classic 555 timer, to form a light intensity to frequency converter.  A small PIN photo diode is used as the light detector.  The pulses produced are short, so in some applications you may want to stretch them or . . . Hobby Circuit designed by David Johnson P.E.-May, 2008

Light to Frequency Converter -  Fout = Ė1.4kHz per microampere of photo diode current, IPD.  The LTC6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz.  It can be used as a fixed-frequency or voltage-controlled oscillator (VCO).  The LTC6990 is part of the TimerBlox family of versatile silicon timing devices.  A single___ Linear Technology/Analog Devices App Note, Jun 16th 2010

Light, LED/Laser, Output Intensity Meter -  This circuit uses a large 1cm X 1cm silicon PIN photo diode and a transimpedance amplifier to measure the light power output of infrared and visible LEDs and laser diodes.  It can be modified to produce almost any milliwatts to volts scale factor.  It can b . . . Hobby Circuit designed by David Johnson P.E.-July, 2000

Line-Powered Xenon Flash Transmitter -  This line powered xenon flash circuit drives a small camera type flash tube.  It has an optical isolator to allow the flash to be safely triggered from some remote device.  A flash rate of 2Hz is possible with the circuit. . . Circuit by David Johnson P.E.-June, 2000

Low Power 100khz Light Receiver -  By starving a high speed logic inverter for current, this circuit can produce a sensitive 100KHz light receiver circuit, which is immune to ambient light, but only drawing 100 micro amps from a 3 volt supply. . . Circuit by David Johnson P.E.-April, 2005

Low Power 40KHz Light Detector -  This circuit is designed for detecting infrared light modulated at around 40KHz.  Itís feedback scheme cancels much of the DC component from ambient light.  Itís conversion factor is about 100 millivolts per microwatt of 900nm light.. . . Circuit by David A. Johnson P.E.-July, 2006

Nitrogen Spark Generator -  Nitrogen or air sparks are very powerful light sources that produce flashes that last only a few nanoseconds.  This line powered circuit generates a continuous series of very small sparks across electrodes with a 0.05 inch gap . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Pulsed LED Test Circuit -  This circuit is designed to test visible and infrared LEDs in pulsed mode operations.  It can drive the LED with peak currents in excess of 10 amps.  A light detector nearby can monitor the response time and intensity of the LED under test. . . Circuit by David Johnson P.E.-June, 2000

RFID Test Circuit -  I designed this test the concept of using light techniques to send identification data instead of RF. . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

Simple Circuit Nitrogen Spark Generator -  Nitrogen or air sparks are very powerful light sources that produce flashes that last only a few nanoseconds.  This line powered circuit generates a continuous series of very small sparks across electrodes with a 0.05 inch gap. . . Circuit by Dave Johnson P.E.-June, 2000

Tester for Pulsed LEDs -  This circuit is designed to test visible and infrared LEDs in pulsed mode operations.  It can drive the LED with peak currents in excess of 10 amps.  A light detector nearby can monitor the response time and intensity of the LED under test . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Transmitter for Line Powered Xenon Flash -  This line powered xenon flash circuit drives a small camera type flash tube.  It has an optical isolator to allow the flash to be safely triggered from some remote device.  A flash rate of 2Hz is possible with the circuit . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Voltage to Frequency Converter + 1us LED Pulse Driver -  This circuit receives the signal from the above amplifier and launches powerful 1uS infrared light pulses from a low cost LED that are frequency modulated by the audio information.  The 10KHz center frequency of the pulse stream is low enough so a standard. . . Circuit by Dave Johnson P.E.-March, 1999

Xenon Flash Receiver-AIR Transparancy Monitor -  I designed this receiver circuit many years ago to monitor the quality of a mile long column of air for future optical communications experiments.  The transmitter system (circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Xenon Flash Transmitter-AIR Transparency Monitor -  This is the matching transmitter for the above receiver.  The transmitter launches powerful 1000-watt light pulses that last about 20 microseconds . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000


Free Space Circuits:  #'s - K         L - Z

 


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