Cell Phone Detector Posted Mar 09‚ 2013 at 10:16 am Project Summary This is a mobile phone sniffer circuit that can detect the signals being used in the GSM (Global System for Mobile Communication) band at about 900 MHz. Since the signals are digitally encoded‚ it can detect only the signal activity‚ not the speech or the message contents. A headphone is used to hear the detected signals. Project Description The circuit schematic is given in the .rar archive attachment. There are two separate
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Metal detectors in schools pose more of a threat than a sense of security. Every student carries metal of some form on them. Pens‚ pencils‚ notebooks and other school supplies all contain metals. If we try to make schools “safer” by placing metal detectors in the entrance and exit of every school building. With many school shootings and stabbings‚ media and parents have proposed new safety measures. Placing metal detectors and spending extra time on safety management takes time away from class and
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ULTRASONIC TESTING (UT) USEFUL FORMULAE 1. Velocity of Ultrasonic Waves in a medium (V) = f x l OR W here f = Number of cycles per second is called frequency. Measured in ‘Hertz’. Abbreviated as ‘Hz’. One Hertz is equivalent to One cycle per second l = Distance covered in one cycle is wavelength V= Velocity of Ultrasonic wave inside the medium in ‘mm/s’ 2. A coustic Impedance (Z) = V x r W here: Z= Acoustic Impedance r= D ensity V= Velocity 3. R eflection Coefficient
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Ultra Sonic Radar General Description This is a very interesting project with many practical applications in security and alarm systems for homes‚ shops and cars. It consists of a set of ultrasonic receiver and transmitter which operate at the same frequency. When something moves in the area covered by the circuit the circuit’s fine balance is disturbed and the alarm is triggered. The circuit is very sensitive and can be adjusted to reset itself automatically or to stay triggered till it is reset
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surface or groove that imparts motion to a follower ➢ Cams are very important and frequently occurring elements in many types of machines – especially AUTOMATIC MACHINES ➢ Cams are the heart of such automatic devices as automatic devices as automatic machine tools‚ record changers‚ mechanical calculators‚ cash registers‚ and many other devices. Types of Cams: Motions Used for Cam Followers: ➢ The motion of the follower is of primary interest
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One World: Motion Topic: Write an article that explores how the Physics of Motion is (or can be) used to solve a specific problem in a local or global context. Millions of people everywhere around the world make use of the principles of motion to travel up and down quickly within a tall building. The use of elevators has been around since ancient medieval times since then has grown from being powered by a hoist and winder to electric and hydraulic motors1. An elevator
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Lab #1: Uniformly Accelerated Motion This is an example of a laboratory report. For a detailed description of how to complete a lab report‚ consult the laboratory manual. When writing your lab reports‚ use your own words. Do not copy from this sample or from the laboratory manual. Your name: Lab partners’ names: PHYS 1.2 L Section: Instructor: Prof. Gelman Date: Objectives To investigate the properties of a uniformly accelerated cart moving down an inclined plane. To measure the instantaneous
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1.5.2.5 Detectors The detectors used in UPLC should be able to handle very fast scanning methods because half-height peak widths of less than one second are usually obtained with columns packed with 1.7 µm particles. The detector must be able to give high sampling rate adequate to capture enough data points across the peak for an accurate and reproducible integration of analyte peak. The dispersion (volume) of the detector flow cell must be minimal to maintain separation efficiency. Conceptually
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ELEGANT HOME WITH POWER SAVING‚ SECURITY‚ SAFETY‚ REMOTE CONTROLLING AND AUTO CONTROL OF WATER TANK MOTOR CHAPTER 1 ABSTRACT The main aim of this project is provide security‚ safety and automation for homes and offices. These are very essential in present life style. Security is primary concern for every one. This Project describes a design of effective security alarm system that can monitor the house with eight different sensors. Unauthorized access‚ Fire accident‚ wall
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the TMS project under the Department of Electronics and Instrumentation‚ Bits Pilani. The cooperating teachers and experienced staff has added to the entire experience of the learning. The report covers the basics of Resistance Temperature Detectors (RTDs) and their characteristics. The report also discusses about RTDs in Bridge
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