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Laser Circuits

Lasers:  #'s - H      I - L      M-Z
 

Last Updated: November 30, 2017 10:29 AM


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

Circuits Designed by Dave Johnson, P.E. :

40Khz Burst Laser Diode DriverSome laser tag or simulated combat games can use this circuit to send short bursts of modulated laser light at the opponent's vest, equipped with a matching light receiver.  The circuit operates from three 1.5v cells   (4.5v) that should provide enough energy . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Laser Diode TesterThis circuit can either be used to test laser diodes or as a general purpose modulated light source.  The circuit has an adjustable diode threshold current and an adjustable modulation frequency.  The frequency can be adjusted from below 30KHz to above 50MH. . . Circuit by David Johnson P.E.-March, 1999

LED/Laser Light Output Intensity MeterThis 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 Dave Johnson P.E.-July, 2000

Micro Power 40Khz Burst Laser Diode DriverSome laser tag or simulated combat games can use this circuit to send short bursts of modulated laser light at the opponent's vest, equipped with a matching light receiver.  The circuit operates from three 1.5v cells (4.5v) that should provide enough energy. . . Circuit by David Johnson P.E.-June, 2000

 Count Cars with LaserThis is an illustration how a laser could be used to count traffic and measure the speed of each car passing through the sensor area . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2007

 Laser Used as Vehicular Traffic CounterThis is an illustration how a laser could be used to count traffic and measure the speed of each car passing through the sensor area. . . Circuit by David A. Johnson P.E.-January, 2007

 Tester for Modulated Laser DiodeThis circuit can either be used to test laser diodes or as a general purpose modulated light source.  The circuit has an adjustable diode threshold current and an adjustable modulation frequency.  The frequency can be adjusted from below 30KHz to above 50MH . . . Hobby Circuit designed by Dave Johnson P.E.-March, 1999


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

Laser Alarm triggered by broken beam -  This circuit is a laser alarm system like the one we see in various movies.  It uses a laser pointer beam to secure your valuables and property.  Essentially, when the beam gets interrupted by a person, animal or object, the resistance of a photodiode will increase and an alarm will be activated.  The laser and the receiver can be fitted in same box, sharing a common power supply.__ Learning Electronics

Laser beam Alarm systE - M -  When I did the First Design of this project I used a 3 Terminal "2N5777".  Later I found some manufacturers changed this part to a Two Terminal Device, But the 2 Pin Version is the same, just without that adjustment.  Additionally some persons have had troubles in getting the Relay to work.  "The Circuit IS Correct".  In Any Case, the New Design below uses an SCR to Acomplish the same thing
as the Relay.  And its Cheaper.   __ Designed by G.L. Chemelec

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 Andy Collison

Laser communication via serial Port & More? -  Lately I have been daydreaming a lot in my laser communication course.  Surfing around Search after class, I managed to find an article on sending serial port data over a laser link.  The article is rather old  (1997) , but was published in a prominent Australian magazine.  This is way back when a good, red laser pointer was only $70

Laser Detector-W4KAE -  Schematic only __ Designed by va3iul

Laser Diode Modulator -  Schematic only __ Designed by va3iul

Laser Diode Tester -  This circuit can either be used to test laser diodes or as a general purpose modulated light source.  The circuit has an adjustable diode threshold current and an adjustable modulation frequency.  The frequency can be adjusted from below 30KHz to above 50MH. . . Circuit by David Johnson P.E.-March, 1999

Laser diode transmitter RF section -  Schematic only, no circuit description

Laser Door Alarm -  This simple fake car alarm or alarm decoy circuit device will simulate the presence of a burglar alarm in automobiles or homes.  It has a few components, uses LM3909 and is easy to build.  Mount R1 where daylight can fall on it.  You may change the capacitor value for different flashing rates.  During darkness, LED1 flashes,  __ Designed by Popescu Marian

Laser- Guided Door Opener -  This automatic door opener can be made using readily available components.  The electromagnetic relay at the output of this gadget can be used to control the DC/AC door-opener motor/solenoid of an...__ Electronics Projects for You

Laser Head 1.0 -  74AC86-based solar head; lights a high-intensity LED when locked on a bright light.  

Laser high-voltage power supply -  The traditional approach is to use a small neon-tube transformer with a variable autotransfomer  (a Variac) used to control the AC input voltage to the transformer.  While larger transformers may be rated at 15kV at up to 60mA this is overkill for most applications  (not to mention overkill in the lethal sense60mA will ensure almost certain death !) .  Smaller transformers may be found which output 8kV at 5mA and are better suited to capacitor charging applications.  Similar transformers may be found in old photocopiers __ Designed by Professor Mark Csele's Homebuilt Lasers Page

Laser Link Communicator -  Audio transmission up to few hundred metersThere's something rather futuristic about talking 'over' a laser beam, which is what this inexpensive project allows.  It will easily give a communication distance of several hundred metres, and with a parabolic light reflector, up to several kilometres.  It transmits high quality audio and the link is virtually impossible for anyone else to tap into.   __ Designed by Peter Philips, ELECTRONICS Australia, July 1997, page 62

LASER Power Supply -  If you have ever worked with lasers, you know how fun and interesting it can be, you also know how expensive it can be.  The high voltage power supplies for the laser tubes are often more expensive then the tubes themselves.  This supply can be built with commmon parts, most of which you probably already have in your junk box.  The secret is the transformer used.  It is a common 9V 1A unit, connected backwards for step up __ Designed by Aaron Cake

Laser Range Finder -  This is based on the Servo robotics magazine's laser range finding article  (Aug-Sept '06) . 
My goal is to create a device that can return a vector of distances to obstacles 360 degrees around. 
I'll probably have to rotate a single  (or dual!) laser ranger assembly on a stepper/motors to scan around.   __ Designed by Stephane's Robotics web page

Laser RX/TX Audio -  Schematic only __ Designed by va3iul

Laser Security SystE - M -  This project powered using a mobile charger which gives 6volts and 500mA.  It can also powered using battery ranging 6volts.  In this 2x5v relays are used.  There is a simple password...__ Electronics Projects for You

Laser simulator helps avoid Destroyed diodes -  6-Jan-05 EDN-Design Ideas Laser diodes can destroy themselves in a few nanoseconds, so testing the response and stability of a feedback-stabilized laser-diode driver can be expensive.  The simulator circuit in Figure 1 shows a typical laser-diode package, which contains not only the diode, which is driven by current I - L, but also a photodiode __ Circuit Design by Nick Cornford, Berkhamsted, Hertfordshire, UK

Laser Target Finder Sensor  -  I originally built this sensor to be able to perform triangulation navigation.  I needed a way to locate three targets from some distance, so a laser pointer seemed to be tailored for the job.  To keep things simple, I wanted to have passive targets, and used catadioptric reflectors to send back laser beam to the sensor.  Now I needed to be able to detect this reflected light.  I first thought of integrated circuits used as infra-red remote control receivers, but these devices are sold as modules integrating the IR sensitive element and a filter eliminating visible light.  I was out of luck: inexpensive laser pointers are red, a wavelength well out of the sensitivity range.  I then found Plessey SL486 device, an old remote control receiver chip __ Designed by Philippe "Philo"Hurbain

Laser Torch-Based Voice Transmitter & Receiver -  Using this circuit you can communicate with your neighbours wirelessly.  Instead of RF signals, light from a laser torch is used as the carrier in the circuit.  The laser torch can__ Electronics Projects for You

Laser transmitter/receiver -  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 MWK Industries.   __ Designed by Aaron Cake

Laser Used as Vehicular Traffic Counter -  This is an illustration how a laser could be used to count traffic and measure the speed of each car passing through the sensor area. . . Circuit by David A. Johnson P.E.-January, 2007

Laser-Based Intruder Alarm -  You can use this laser-based intruder alarm conveniently at the entrance of a hall or any other similar location to protect the same from unauthorised access as and when desired.  Its...__ Electronics Projects for You

Laser-diode control -  09/19/02  EDN-Design Ideas Laser diodes are sensitive to ESD, rapid turn-on currents, and overvoltage conditions.  To address those problems, the simple laser-diode controller in Figure 1 has several functions.  The first part of the circuit comprises an 8.2V  __ Circuit Design by Michael Fisch, Agere Systems, Longmont, CO

Laser-Diode Driver Stabilizes Sensitivity Parameters -  11/05/98 EDN-Design Ideas -  (File has many circuits, scroll to this one) The conventional advantages of lasers—coherence, monochromaticity, and extreme compactness—make laser diodes popular in most of their potential applications.  Biomedical diagnostics and high-resolution-spectroscopy applications exploit laser diodes' wavelength tunability.  These applications use the laser wavelength's sensitivity to drive current and operating temperature—0.025 nm/ and __ Circuit Design by Anil Kumar Maini and Nita Sen, Defence Science Centre, Delhi, India

Laser-Guided Door Opener -  This automatic door opener can be made using readily available components.  The electromagnetic relay at the output of this gadget can be used to control the DC/AC door-opener motor/solenoid of an electromechanical door opener assembly, with slight intervention in its electrical wiring.  A laser diode  (LED1) is used here as the light transmitter.__ Learning Electronics

Laser-Torch Wireless Communication -  Schematic only __ Designed by va3iul

Lazer Tag Equipment Modifications -  I added a "fast-fire" circuit to get around the annoying delay that prevents you from firing again immediately.  It used the target LED contact on the trigger switch to reset the pulse generator.  That way, normally when you fire the sound goes on for its normal duration  (we banned any mod that would turn off the sound or always __ Designed by John DuBois

LED/Laser Light 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 Dave Johnson P.E.-July, 2000

Low noise PIN diode laser receiver -  This article will describe a simple low noise PIN diode front end suitable for laser communications.  Two schematics are presented, one for nighttime use and one for daylight use.  Although it may be possible to add switching to the front end to allow one front end to work for both night and day I decided against this due to the extremely high impedance involved and degradation associated with loading on the PIN diode. __ Designed by JohnK3PGP


Lasers:  #'s - H      I - L      M-Z


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