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laser trip wire alarm system
Building a DIY Alarm System: The Concept So, you want to protect your property, or maybe a room, car, or even your backyard. The concept of an alarm system is to notify the ""alarm administrator"" that there is an intruder entering the previously designated boundaries. The triggers for this boundary could be as simple as a pressure sensor, or as...
laser door alarm circuit
This is a circuit for laser door alarm is based on the interruption of Laser beam. A low cost Laser pointer is used as the source of light beam. When somebody breaks the laser path, the alarm will be generated for few seconds. This is the figure of the circuit; The laser door alarm circuit has two sections. The laser transmitter is a laser pointer
laser diode driver circuit
This is circuit design for a laser diode driver can be implemented using voltage-controlled current source. This simple linear laser diode driver gives cleaner drive current than a switched (PWM) drivers. This circuit is based on OPA350 IC. This is the figure of the circuit. A Howland current pump with a current booster is used as the basic of thi
40khz laser burst detector
This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst, modulated at 40KHz. It is very sensitive and could be modified for long-range laser communicati
This page describes the conversion of a simple, inexpensive green laser pointer into a lab-grade laser. The heart of this DPSS laser is an inexpensive green laser pointer. Such pointers are actually diode-pumped solid-state (DPSS) lasers consisting of a small vanadate (Nd:YVO4) laser (operating at 1064nm) pumped by an 808nm diode laser and...
stealth action laser tripwire system
With these, you can make your very own security system that gives intruders a sporting chance! It`s the laser-version of saying But before I kill you, Mister Bond This laser tripwire system will trigger an audio alarm (made from a 110dB piezo personal alarm from the 1$ store) when something breaks the laser beam, which is provided by a si
laser sup circuit
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 tran
laser controlled on off switch
This circuit is built around a 555timer using very few components. Since the circuit is verysimple, even a novice can easily build itand 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 operationalconditions from a distance of500 metres and...
police laser lidar jammers
That HID headlights + small slim line plates REDUCE the distance a police car can ambush you (lock in with laser/LIDAR) to get..
laser tag game multi player
This system includes a processor which may have been a microcontroller but it did not have alarge memory and so an obvious improvment to this system is to use the internal RAM and ROM in a modern microcontroller. Note There are lots of circuit elements here that you can use such as a Xenon strobe light driver. Flowcharts are also included that sho
build a modified green laser pointer
home built laser system
I have developed an inexpensive control system (less than $70) that can be used to both get more cutting power out of a DC discharge laser and significantly improve cutting accuracy for home built laser systems. The control system implements a control technique known as Pulse-Per-Inch (PPI) control. PPI control involves pulsing the laser every tim
cnc laser buildlog
The recent Epilog Laser Challenge at Instructables. com got me thinking about building a low cost CNC laser. The engrave r they had as the prize had a list price of about $8, 000. The income tax on that would be quite a lot. I thought a larger more powerful machine could easily be built for less than the amount you would have to pay for the tax....
sound via laser light
The transmission distance can be increased greatly by replacing the transmitter`s red LED with a cheap red laser diode purchased from a $2 Dollar Shop . The circuit design makes a compromise between laser brightness and sound quality and loudness. This is because the laser needs to be bright enough so that it is easy to locate the beam when posi
cmos toggle flip flop using laser pointer
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..
laser communication project circuit
laser command circuit
Laser Command is a game which I build using a 8x8 matrix LED and an Arduino Mini. This game was developed as a "sample" class project in S10-05833 Gadgets, Sensors and Activity Recognition in HCI. The class is taught by Scott Hudson at Carnegie Mellon University, and I`m doing TA for the class. The name "Laser Command" comes from an old game...
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
Laser Alarm Schematic
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,
Laser Controlled ON - OFF Switch
This 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 co..
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 t..
Nitrogen Laser High Voltage Power Supply
The schematic of the power supply is shown below. It runs off standard household power of 120VAC 50/60Hz, and the output is adjustable up to 25kV or more. For..
Help with Laser Alarm Circuit
Hey all I`m new to both the forums and electronics. Recently I chanced upon a Laser Alarm System and decided to give it a go..
Laser Door Alarm Circuit
This laser door alarm is based on the interruption of Laser beam. A low cost Laser pointer is used as the source of light beam. When somebody breaks the la..
laser security system
A simple and cheap Laser Based Security System, which costs below Rs. 100. It is a simple circuit using LM358 OP-AMP and LM555 Timer. This circuit is triggered when the Laser beam falls on the LDR interrupts, which sounds the buzzer connected to it. This can be used to protect your valuable items, money, room etc. By using different mirror
Speed of Light with Nanosecond Pulsed 650 nm Diode Laser
Wireless Stepper Motor Control using Laser and IC555
Wireless stepper motor speed control project using laser and IC555. Read to know about basics and circuit construction using a wireless stepper motor which has speed control through laser and IC 555
laser transmitter receiver
CMOS Toggle Flip Flop Using Laser Pointer circuit
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 volts when illuminated by the laser pointer or other light source..
Laser Power Supplies
Construct universal power supplies, including: Low-voltage power supplies for operating electronic equipment are in the next section. There you`ll find designs for single- and dual-voltage regulated supplies, including an all-purpose adjustable version and battery pack regulators. A helium-neon laser tube must be connected to a high-voltage...
Build an Experimenters Power Supply
Note the incoming ac routed to the primary terminals on a 12. 6-volt transformer. The hot side of the ac is connected through a fuse and a single-pole single-throw (SPST) toggle switch. With the switch in the OFF (open) position, the transformer receives no power so the supply is off. The 117 VAC is stepped down to about 12. 6 volts. The...
Light Sensing Circuits
Light Dimmer Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
DIY HV Variable Capacitor
DIY PMA Alternator Plans
Digital Signal Integrity