XREP – A Combination of Taser and Shotgun

We have already discussed about StunRay Technology and its capability to substitute tasers and guns used in law enforcement. But, there are some limitations to the amount of damage you can do to the suspect if he is not in front of you. That is why tasers are considered more effective as it will leave the suspect electrocuted and numb for a quite a long time, which is more than enough to...

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PIR Sensor Based Security System

The circuit of an inexpensive and highly secure electronic security system is explained below. This electronic security system can be used in banks and other high security areas.A normal electronic security system will have a transmitter and a receiver. The transmitter sends out an IR laser and this will be received by the receiver. When an intruder walks past the device, the IR beam is cut and thus...

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‘Cling-Film’ Solar Cells – A New Revolution for Renewable Energy

Polymer Solar CellScientists from the Universities of Sheffield and Cambridge have started a new research that promises to produce cost-effective and highly efficient cling film solar cells. The idea was first published in the journal “Advanced Energy Materials”. According to them, these solar cells can also be produced with much ease. This has clearly become a great advancement in the field of renewable...

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The World’s Largest Fusion Reactor

Since, 1932, researchers have been successful in combining hot fusion with nuclei. Till then the concept of cold fusion was used and did not produce any satisfactory results. The research in hot fusion is still continuing and they have been successful in providing danger-free, very good potential energy source without producing much wastes. Some of the main advantages of a fusion power plant is that...

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Water level alarm circuit

Description. Here is a simple water level alarm circuit that will produce an audible alarm when the water level reaches  a preset level.The circuit can be powered of a  3V battery and is very handy to use. The circuit is based on an astable multivibrator wired around IC1 (NE 555).The operating frequency of the astable multivibrator here will depend on capacitor C1, resistances R1,R2...

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Door bell circuit using NE555

Description. The main part of this doorbell circuit are two NE555 timer ICs.When some one presses switch S1 momentarily ,the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1. When the switch S1 pressed, IC1 is triggered at its pin 2 and output pin 3 goes high for a time period previously set by the values of POT R4 and POT R5.When the...

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IC based TV transmitter circuit

TV transmitter circuit. A very simple and high quality TV transmitter circuit based on IC MC374 is shown in this article.MC1374 is an integrated TV modulator circuit that can be used in various TV transmitter applications. The MC1374 includes all necessary circuitries required for a TV modulator such as sound carrier oscillator, FM audio modulator, dual input RF modulator etc. The IC packed with...

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Magnetic Microprocessors Can Make High-End Computers in Future

Two researchers at the University of California, Berkeley, Jeffrey Bokor and Brian Lambson are developing a new concept called “Magnetic Microprocessors”. According to them, this new concept would be so efficient that the energy consumed by them will be very less as described by the 2nd law of thermodynamics. Though the multi-processors used today are known to be efficient, the fact is that...

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