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LASER DIODE Laser is the shortened form of light amplification by stimulated emission of radiation. a laser emits radiation of essentially one wave length or a very narrow band of wavelengths. This means that the light has a single colour. ie; monochromatic The unique property of light produced by a laser is that the emission is in the form of a very narrow beam without significant divergence. The light generating process of a laser diode is similar to that of an LED and the materials used are often the same. The difference is that the laser diode uses a much smaller junction and the concentration of injected carriers is much higher. The active region of a laser diode is enclosed by two aluminum enriched layers of lower refractive index to act as optical reflectors. Because of the confinement caused by these reflectors, light can exit only from the front or back faces of the laser diode. These faces are semi-transparent and form a resonator cavity for the light. At a certain current...

This Laser Controlled ON/OFF switch circuit is built around a 555 timer using very few components. Since the circuit is very simple, even a novice can easily build it and use it as a controlling device. A laser pointer, now easily available in the market, can be used to operate this device. This circuit has been tested in operational conditions from a distance of 500 meters and was found to work satisfactorily,though it can be controlled from still longer distances. . Laser Controlled ON/OFF switch Circuit diagram : Laser Controlled ON/OFF Switch Circuit Diagram Aiming (aligning) the laser beam exactly on to the LDR is a practical problem. The circuit is very useful in switching on/off a fan at night without getting off the bed. It can also be used for controlling a variety of other devices like radio or music system. The limitation is that the circuit is operational only in dark or dull lit environments. By focusing the laser beam on LDR1 the connected gadget can be activated throug...

This is a simple project of Laser Level Detector Circuit Diagram. Rotating laser levels, which are very handy  for setting objects in a room or garden at the  same height, are available at prices of a few  dozen pounds. At relatively large distances  and for outdoor use, the light from the rotating laser beam is often not easy to see, and  the laser beam detector described here can  be useful in such situations. The detector  works well at distances up to 50 metres (150  feet) and consists entirely of standard components. The detector is housed in a plastic case  that can be fixed to an object (such as a post  or a beam). It has three LEDs and a beeper that  indicate whether the object should be raised  or lowered. . . LEDs with a transparent package and integrated lens (round surface) are used as sensors. The top and bottom detection zones  each have five LEDs and two opamps (IC1a &  IC1b or IC1c & IC1d), whic...

SIMPLE LASER BURGLAR ALARM CIRCUIT It is an advanced, simple, efficient and low cost circuit. You can use this circuit on Home, office, locker or anywhere for Security purpose. As the name suggests, the circuit is based on Laser. We all know about the features of Laser, Long Range, pointed beam, Low power consumption and so on. The Transmitter section of this circuit is a LASER. Circuit Diagram of Laser Burglar Alarm Components Used In Laser Burglar alarm circuit IC TLO71 T1 L14F1 (Photo Transistor) T2 BC 548 R1 1KΩ R2 4.7KΩ R3 4.7KΩ R4 100Ω C1 470μF C2 1000μF LED Buzzer 9V Battery Working of Laser Intruder/Burglar Alarm Circuit. This circuit alarms whenever someone cross the Laser beam transmitted from a LASER. The output of IC TL071 goes high whenever their is no Light(Laser) Ray. This output voltage is further amplified by means of a NPN transistor Q2, which will drive the buzzer and generates an alarm. How to Setup Laser Burglar Alarm? As i mentioned above, you can use an ordinary...

The circuit below is similar to the one above but can be used with a laser pointer to toggle the relay rather than a push button. The IR photo transistor Q1 (Radio Shack 276-145A) or similar is connected to the set input (pin 6). The photo transistor should be shielded from direct light so that the voltage at the set input (pin 6) is less than 1 volt under ambient conditions and moves to more than 10 volts when illuminated by the laser pointer or other light source. The reset time is about a half second using a 4.7uF cap which prevents the circuit from toggling more than once during a half second interval. The 10K resistor and diode provide a faster discharge path for the 4.7uF cap so the circuit can be retoggled in less than 1 second. The 3K resistor in series with the photo transistor may need be adjusted for best performance. The relay shown is a solid state variety to be used with lights or other resistive loads at less than 3 amps. A mechanical relay can also be used as shown in c...