The Law Enforcement In England And Wales Criminology Essay

The Law Enforcement In England And Wales Criminology Essay Police officers are perceived as the gatekeepers of the criminal justice system (Mendias Kehoe, 2006:70). They are in charge in ensuring safety and security of the public, preventing crimes, and apprehending offenders. Law enforcement in the England and Wales traces its roots back to the kin policing established in the 1800s to provide protection in the communities. This form of policing flourished until increasing threats brought by terrorism compelled the government to implement changes in the police force in the 1960s. The decades following this transformation gave way to various concepts aimed at enhancing the quality of police service. Today, England and Wales follow a law enforcement style of policing in each of their decentralized forces. This paper aims to provide a critical appraisal of the policing style in the England and Wales. The next section of the paper presents the evolution of the police force. This is followed by a discussion of the different features of the England law enforcement. Critical appraisal is presented in the discussion section. Lastly, a conclusion is presented. Law enforcement in England and Wales According to Alpert and Dunham (2009), policing in England started as a private force for the elite members of society. Those who cannot afford to hire their own guards rely on a shared and informal form of policing called the kin policing. People are expected to ensure their own safety, serve as guardians of their own community, and bring forth criminal acts to the court of law. According to Beckley (2007: 938), this form of policing was employed until the 1960s when terrorism threats prompted the development of more appropriate policing strategies. The Police Act of 1964 provided for the establishment of more scientific and organized law enforcement to meet the changing needs of the public. Police professionalism standards such as the Metropolitan Police Principles and the Association of Chief Police Officers Statement of Common Purpose and Values of 1985 were established. Various innovative changes in the police force followed these developments and continued to this day. Despite these changes, policing in England and Wales still exhibit some characteristics of its older form as evidenced by the lack of centralized police system. Today, law enforcement in England and Wales consist of 43 individual county police forces. Having this system implies diversity in policing strategies between the different counties (Hawdon, 2008: 191). Moore (1992: 107) on the other hand observed that despite all this, professional law enforcement remained the main basis of any policing strategy. Features of law enforcement in UK and Wales Das and Verma (2003: 190) contend that police organizations are shaped by culture, political priorities, and immediate needs of the situations surrounding them. Law enforcement in England and Wales has distinct features that separate it from other police forces in the world. Professionalism Das Verma (2003: 204) noted that law enforcers in Europe are noted for their professionalism. They are among the best in terms of training and education. Despite this advantage, Moore (1992: 110) argued that professionalism in police force is an ambivalent concept. He believes that police professionalism should not only focus on criminal laws but also those laws that protect citizens from arbitrary action by government agencies- including the police. Thus, the police officers emphasis on the crime control rather than the law contradicts the essence of their professional duty. Multi-functioning McGarrell, Freilich, and Chermak (2007: 143-4) contend that law enforcement has changed more than any other agency in the public bureaucracy since the 1960s. The authors added that the developments in Englands police force were not only brought by threats of terrorism but also by the social and political changes in the past two decades. Police force had to adjust to meet the changing needs of the public. Police officers are not only expected to enforce laws but also to ensure public safety and security, investigate crimes, do job-related community service, control traffic, and respond to publics call for assistance (Das Verma, 2003: 224). The multitude of tasks expected from the police makes it hard to measure police performance and thus result to ambivalent perceptions about the force. Alpert and Dunham (2009) assert that people have conflicting views of the police. They are brave crime fighters and heroes on one hand and corrupt, heartless, and brutal on the other. Public perceptions about the police are often based on selective positive and negative experiences and not on their collective performance. Beckley (2007: 939) also noted the lack of centralized police organization like the National Guard or Compagnie Re ´publicaine de Se ´curite ´ in the United States and France in the UK. This function is decentralised to the various police forces. UK police officers are in charge of community policing tasks as well as specialist police duties. They have to perform tasks from traffic supervision and community patrol to criminal investigation. Technologically advanced According to Swanson, Territo and Taylor (1993), police officers not only need human and conceptual skills but also technical skills. They have to be able to use computers; analyse evidence; apply management principles; and perform planning, accounting and budgeting functions. The use of radios, mobile phones and vehicles in patrolling enables police to respond to calls for help quickly. Computers made reporting and record keeping more effective and efficient. The advancements in forensic science brought investigations to a different level. However, critics say that the use of patrol cars instead of foot patrolling limits interaction between the community and police, thus contributing to the degradation of police and community relations. Power Weisburd and Braga (2006:13) stressed the polices capability to perform their tasks without public intrusion. Despite the fact that they are established by the government and accountable to the public, they remain independent (Moore, 1992:109). Alpert and Dunham (2009) contended that police officers are provided with enormous discretionary power which may not be beneficial to the public. Das and Verma (2003:224) argued that the fact that the UN General Assembly formulated the Code of Conduct for Police Officials in 1979 attests to the authority of the police and the need to prevent abuse and misuse of this power. Reactive policing Moore (1992: 112) also recognised the reactive characteristic of policing. Police officers tend to rely on patrols and calls from the public to solve crimes. The advantage of this strategy is that it prevents the police from interfering in private lives of the people without their consent. This ensures that the participation of the police in the situation is necessary, official and acceptable to the community. However, this strategy is problematic because it implies that a crime has to be committed before action can be taken. While this is an effective law enforcement strategy, it is not a good crime control method. Moore also observed that it cannot be utilised in crimes where there are no victims or witnesses or where victims refuse to come forward. Discussion and appraisal of the law enforcement policing Based on the discussion provided above, it is apparent that the law enforcement style of policing in England and Wales has advantages and disadvantages. Although police officers in the England are known for their professionalism, their tendency to focus on crime prevention rather than law enforcement reflects misguided understanding of their professional duty. As a result, police legitimacy and effectiveness remains problematic. According to Moore (1992: 111), there is no indication that policing has delivered in their diverse functions. He noted that: there are no positive correlations between patrolling and crime prevention; police crime investigations are not always fruitful; response systems do not guarantee arrests; and criminal punishments do not always result to rehabilitation. This shows that implementation of policies like the UN General Assemblys Code of Conduct for Police Officials and the UNDP Police Act (UNDP Bureau for Crisis Prevention and Recovery, 2003) are necessary to ensure police accountability; improve efficiency and effectivity; and prevent police misuse and abuse of power. The multitude of police functions makes performance evaluation difficult and inconsistent. Beckley (2007: 939) noted the absence of specialised duty delegation in the UK police. Police officers are expected to be able to perform duties from the community patrolling to crime investigation. While this is advantageous in the overall growth of police officers, it prevents the development of specialised and quality skills that can only be learnt from constant exposure to a specific task. The multiple functions required of the police force prevent them from specializing and optimizing their potential in a given function. They are spread too thin to be efficient and effective. Technological advancements on the other hand have undoubtedly promoted the efficiency and responsiveness of the police force. They are able to provide timely response to citizen calls. However, too much reliance on technology discourages the police to depend on their own resources and hone their skills. By using vehicles instead of foot patrolling, the police loses the opportunity to mingle and connect with the people. Some police officers obtain information from the internet and database records instead of going to the field. Investigation and prosecution proceedings are relying more and more on forensic science to provide evidence. This reduces if not eliminates the need for people participation in the process. Employment of technology reduces interaction and prevents the creation of a better and more cooperative relationship between police and the people. As a result, the gap between police and community expands. People are not comfortable dealing with the police and may hesitate to call for assistance or help them in their investigations. Hillyard and Tomlinson (2000: 400) believe that police officers have political, legal and financial accountabilities. However, closer inspection of the police force reveals that police officers are only accountable to their professional mandates and not to anyone else (Moore, 1992: 116). Despite the introduction of the value for money service in law enforcement under the Thatcher government (Long, 2004), the police force still have the discretion to decide which public concerns are important and which are not part of the police work. They can refuse assistance if they deem the work to be irrelevant to police functions. This promotes public distrust to the police. Although there is increasing recognition of the need to enforce police accountability, the question about how and to whom they should be made accountable remains. The authority and autonomy given to the police force on the other hand creates dangers on the way police works. While the idea of a law enforcement emancipated from the government is alluring, the unrestrained power it afforded the police can be daunting. The police functions as an objective agency that protects the people from criminals and from the government abuses; however, there are beliefs that the people are also susceptible to dangers from the police force itself. Organisations like the UNDP recognize the authority of the police force and how this could result to abuse and misuse of power. There is a need to draw the line between accountability and authority; between policing and coercion; and between public safety and citizen liberty. Furthermore, Moore (1992: 117) also argued that the lack of governmental regulation and public control in policing also results to their stagnation. They remain oblivious of the government and citizens views, thus they are limited by their own perceptions and mandates and fail to make appropriate improvements in their services. The UK police force is now perceived as an industry rather than an agency. They have become productivity-oriented (high clearance rate, high arrest rate and high productivity) rather than community-oriented. As mentioned earlier, the lack of centralised police agency in the UK gives the police force more authority and responsibility. Their involvement is not only limited to the community but to the entire nation. They have more authority than their counterparts from other countries. They have too much power and too little regulation, thus, the risk of police domination. Reactive policing requires the police to take action after a crime is committed. This ensures that the police are not unlawfully intruding into the lives of the citizens. However, this promotes retrospective instead of preventive action. It relies on victims and witnesses in order to enforce the suitable police action. Also, reactive policing does not ensure the apprehension of the offenders. Thus, this strategy does not help reduce crime. Another issue is the deterioration of relationship between police and the public. Negative issues like police discrimination, aggression, abuse and corruption had resulted to the publics mistrust of law enforcers. This prevents the public from cooperating with police officers in community patrols and crime investigations. They do not believe that helping the police will lead to safer and more secure community. The flow of information to the police is not as strong as it used to be. According to Moore (1992:117), some people choose to stay quiet than cooperate with the police to avoid retaliation from the violators. This implies not only the peoples lack of trust on the integrity of the police force but also on their capability to protect them. Conclusion The law enforcement style of policing in the UK and Wales is both favourable and detrimental to the performance and effectivity of policing and the publics perception of the police force. It promotes professionalism of the police force. The various features of policing in England and Wales reflect the governments attempt to improve the police force and meet the changing needs of the public. The integration of various strategies such as reactive policing addresses the concern of involvement and interference. Technological advancements are incorporated for more efficient, effective, responsive, and up-to-date system. However, the multitude of functions makes performance evaluation problematic. Despite these imperfections, law enforcement style of policing in the UK and Wales is effective as it provides a common backdrop to the various police agencies in the said places.

Fastest Finger First Project Report

Fastest Finger First Project Report Abstract In the buzzer round of quiz contests, the question is thrown open to all the teams. The person who knows the answer hits the buzzer first and then answers the question. Sometimes two or more players hit the buzzer almost simultaneously and it is very difficult to detect which of them has pressed the buzzer first. In television shows, where the whole event is recorded, the actions are replayed in slow motion to detect the first hit. Such slow motions are possible only where huge funds are available to conduct the show. For this reason buzzer rounds are avoided for quiz contests held in colleges. This project is an electronic quiz buzzer that is affordable by the colleges and even individuals. This project is useful for a 4-team quiz contest, although it can be modified for more number of teams. This system is sensitive. The circuit can detect and record the first hit contestant among all the contestants that may appear to be simultaneous Buzzer controllers for 4-team quizzes are readily available in the market. However, buzzer controller capable handling six or eight team are hard to find. The circuit presented here can be used for up to eight teams. It can be easily expanded to accommodated more teams through suitable cascading of latches and AND gates along with transistors, relays, etc. In the buzzer round of any quiz contest question are thrown open to all the participating teams. Each team has a push button switch to ring the buzzer. After hearing the question any member of a team who knows the answer and hits there switch first gets a chance to answer. In multiple cases who hit the switch first gets the opportunity to reply. For next round the quiz master reset the buzzer operation circuit by pressing the reset switch. For visual indication all teams have the lamp fitted on their desk. The lamps glow until the reset of buzzer controller indicating the eligible team for replying the question. For audio indication the buzzer rings and turns off automatically after a few second. The audio visual circuit is powered through actuation of relay contacts. Here 230v AC has been used. BLOCK DIAGRAM Figure:1 CIRCUIT DIAGRAM Figure:2 Figure:2 Working of Finger first indicator Fastest finger first indicators (FFFIs) are used to test the players reaction time. The players designated number is displayed with an audio alarm when the player presses his entry button. The circuit presented here determines as to which of the 8 contestants first pressed the button and locks out the remaining three entries. Simultaneously, an audio alarm and the correct decimal number display of the corresponding contestant are activated. When a contestant presses his switch, the corresponding output of latch IC1 (74373) changes its logic state from 1 to 0. The combinational circuitry comprising dual 4-input NAND gates of IC3 (7430) locks out subsequent entries by producing the appropriate latch-disable signal. Priority encoder IC2 (74147) encodes the active-low input condition into the corresponding binary coded decimal (BCD) number output. The outputs of IC4 after inversion by inverter gates inside hex inverter 74LS04 (IC5) are coupled to BCDto-7-segment decoder/display driver IC6 (7447). The output of IC6 drives common anode 7-segment LED display (DIS.1, FND507 or LT543). The audio alarm generator comprises clock oscillator (555), whose output drives a loudspeaker. The oscillator frequency can be varied with the help of Preset VR1. Logic 0 state at one of the outputs of IC2 produces logic 1 input condition at pin 4 of 555, thereby enabling the audio oscillator. 555 needs +12V DC supply for sufficient alarm level. The remaining circuit operates on regulated +5V DC supply, which is obtained using (7805).Once the organiser identifies the contestant who pressed the switch first, he disables the audio alarm and at the same time forces the digital display to 0 by pressing reset pushbutton S9 PCB FABRICATION PCB Designing is an important part of the project development, complexity size the PCB for our Project Buzzer Controller For 8-Team Quiz Contests is made by Photo chemical process on copper clad base materials the following steps are involved in Fabrication. Layout designing 1. Art work designing 2. Negative preparation 3. Eleclining 4. Cleaning 5. Coating of Protective layer 6. Drilling 7. Testing Figure:3LAYOUT DESIGNING:- First of all we have prepared the layout designing on graph paper according to the schematic diagram. To layout diagram shown in the tracks on PCB to join the components as per schematic diagram. Taking the consideration actual size (100%) of each components and pin to pin distance of the components. ART WORK DESIGNING:- Art work is the preparation after the layout Modification. Art work is prepared on clad shed by tracking the circuit. On it with tapes different width, circular pads, IC pads cutter 2. NEGATIVE PREPARETION:- For the preparation of Negative the photographic with feint is to cut to the six of the art work it is then place with film in the vertical photographic camera the developer used in the lithe developer. Which consist of A B developer mixed in same proportion. The film is then fixed through fixer which is the Sodium Thiosulphate solution the film then washed with the water and then dried. At least to clean the liquor thinner to protect the tracks from corrosion and moisture effects. Figure:4 4. ELECLINING:- It is the process in which extra copper is removed from copper clad sheet with heep Ferric Chloride(feels) solution. The copper clad sheet is dipped in the feels for about 3 hours. By this process we got the PCB with wanted tracks. 5. CLEANING:- Now remove the dye with help of thinner, wash it with water and dry it in sun light. 6. COATING OF PROTECTIVE LAYERS:- The PCB is now Coated with non-conducting solution. LAQUAR to prevent the tracks from environment hazards like corrosion and moisture effects. Figure:5 PCB LAYOUT FOR FINGER FIRST INDICATOR Figure:6 7. DRILLING:- Drilling is done to create the components lead holes Drill of 1mm.(Diameter) is used. 8. TESTING:- The copper tracks are tested with the digital multimeter if any track is open short can be repaired before mounting the components on PCB. Now PCB is ready for assembly. COMPONENTS LIST Semiconductors: IC1 -74LS373 IC2 -74LS147 IC3 -74LS30 IC4 -74LS00 IC5 74LS04 IC6 74LS47 IC7 -7805, 5V regulator IC8 NE555 timer T1 -BC547 NPN transistor 7- segment display- DIS.1, FND507 or LT543 Resistors (all1/4-watt, +/-5% carbons): R1-R8 -1kilo-ohm R9 -2.2 kilo-ohm R10 -R11 10-kilo-ohm R12-R18 560 ohm VR1 -2-mega-ohm preset Capacitors: C1 -0.01microF, 35V electrolytic C2 0.1microF, 16V electrolytic C3 0.01microF, ceramic disk Miscellaneous: X1 -230V AC primary to 12V, 500mA Secondary transformer S1-S8 -push-to-on switch S9 push-to-off switch BELL -230V AC electric bell Details of various components used Figure:71.74LS373 Figure:8 2.74LS147 Figure:9 Figure:10 3.74LS30 Figure:11 Internal description of 74LS30 Figure:12 Figure:13 5.74LS04 Figure:14 Figure:15 6.74LS00 Figure:16 Figure:18 Figure:17 Figure:19 Figure:20 7. IC7447 Figure:20 8 .Transformer Figure:21 Laminated steel core Transformers for use at power or audio frequencies typically have cores made of high Permeability (electromagnetism) permeabilitysilicon steel. permeability many times that of free space, and the core thus serves to greatly reduce the magnetizing current, and confine the flux to a path which closely couples the windings. Early transformer developers soon realized that cores constructed from solid iron resulted in prohibitive eddy-current losses, and their designs mitigated this effect with cores consisting of bundles of insulated iron wires. Later designs constructed the core by stacking layers of thin steel laminations, a principle that has remained in use. Each lamination is insulated from its neighbors by a thin non-conducting layer of insulation.indicates a minimum cross-sectional area for the core to avoid saturation. The effect of laminations is to confine eddy currents to highly elliptical paths that enclose little flux, and so reduce their magnitude. Thinner laminations reduce losses, Thin laminations are generally used on high frequency transformers, with some types of very thin steel laminations able to operate up to 10  kHz. One common design of laminated core is made from interleaved stacks of pieces, leading to its name of E-I transformer.Such a design tends to exhibit more losses, but is very economical to manufacture. The cut-core or C-core type is made by winding a steel strip around a rectangular form and then bonding the layers together. It is then cut in two, forming two C shapes, and the core assembled by binding the two C halves together with a steel strap. They have the advantage that the flux is always oriented parallel to the metal grains, reducing reluctance. A steel cores means that it retains a static magnetic field when power is removed. When power is then reapplied, the residual field will cause a high until the effect of the remaining magnetism is reduced, usually after a few cycles of the applied alternating current. Over current protection devices such as must be selected to allow this harmless inrush to pass. On transformers connected to long, overhead power transmission lines, induced currents due to during can cause saturation of the core and operation of transformer protection devices. The transformer converts the 220 V AC into 9 V AC. The Bridge wave rectifier converts the ( V AC into rippled DC. This rippled DC is given as input to the 7805/7809 Voltage regulator IC. A separate power supply is given for the Stepper Motor which has the same power supply setup for converting the 220 V AC into 9V DC. The DC Power Supply circuit is based around the 7805 voltage regulator. It has only 3 connections (input, output and ground) and it provides a fixed output. The last two digits of the part number specify the output voltage, eg. 05, 06, 08, 10, 12, 15, 18, or 24. The 7800 series provides up to 1 amp load current and has on-chip circuitry to shut down the regulator if any attempt is made to operate it outside its safe operating area. (If this happens to you, let the chip cool down attach the heatsink.) It can be seen that there are in fact two separate circuits in this power supply. One 7805 is directly connected as a fixed 5V regulator. The second 7805 has a resistor divider network on the output. A variable 500 ohm potentiometer is used to vary the output voltage from a minimum of 5V up to the maximum DC voltage depending on the input voltage. It will be about 2V below the input DC voltage.) The capacitor across the output improves transient response. The large capacitor across the input is a filter capacitor to help smooth out ripple in the rectified AC voltage. The larger the filter capacitor the lower the ripple IC-7805 One can get a constant high-voltage power supply using inexpensive 3-terminal voltage regulators through some simple techniques described below. Depending upon the current requirement, a reasonable load regulation can be achieved. Line regulation in all cases is equal to that of the voltage regulator used. Though high voltage can be obtained with suitable voltage boost circuitry using ICs like LM 723, some advantages of the circuits presented below are: simplicity, low cost, and practically reasonable regulation characteristics. For currents of the order of 1A or less, only one zener and some resistors and capacitors are needed. For higher currents, one pass transistor such as ECP055 is needed. Before developing the final circuits, let us first understand the 3-terminal type constant voltage regulators. Let us see the schematic in Fig. where 78XX is a 3-terminal voltage regulator. Schematic for obtaining low-voltage regulated output using 3-terminal Figure:22 voltage regulators. Rectified and filtered unregulated voltage is applied at VIN and a constant voltage appears between pins 2 and 2 of the voltage regulator. *The distribution of two currents in the circuit (IBIAS and ILOAD) is as shown. It is highly recommended to use the two capacitors as shown. Electrically regulator will be at a distance from the rectifier supply. Thus, a tantalum grade capacitor of 5mf and rated voltage is good. Electrolytic capacitor is not suitable for it is poor in response to load transients, which have high frequency components.At the output side a 0.22mf disc ceramic capacitor is useful to eliminate spurious oscillations, which the regulator might break into because of its internal high gain circuitry. Figure:23 These voltage regulators have a typical bias current of 5 mA, which is reasonably constant. By inserting a small resistor Rx between pin 2 and ground, the output voltage in many cases. By this method voltage increment of 5 to 10 per cent is practically feasible. However, if a high-value resistance is used to obtain a higher output voltage, a slight variation in bias current will result in wide variation of the output voltage. 8. BC547 Transistor In electronics, a transistor is a semiconductor device commonly used to amplify or switch electronic signals. A transistor is made of a solid piece of a semiconductor material, with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistors terminals changes the current flowing through another pair of terminals. Because the controlled (output) power can be much larger than the controlling (input) power, the transistor provides amplification of a signal. The transistor is the fundamental building block of modern electronic devices, and is used in radio, telephone, computer and other electronic systems. Some transistors are packaged individually but most are found in integrated circuits. Figure:24 Features à ¢Ã¢â€š ¬Ã‚ ¢ NPN Silicon Epitaxial Planar Transistors à ¢Ã¢â€š ¬Ã‚ ¢ These transistors are subdivided into three groups A, B, and C according to their current gain. The type BC546 is available in groups A and B,n however, the types BC547 and BC548 can be supplied in all three groups. As complementary types the PNP transistors BC556BC558 are recommended. à ¢Ã¢â€š ¬Ã‚ ¢ On special request, these transistors are also manufactured in the pin configuration TO-18. Mechanical Data Case: TO-92 Plastic Package Weight: approx. 0.18g Packaging Codes/Options: E6/Bulk 5K per container, 20K/box E7/4K per Ammo mag., 20K/box Figure:25 9.Ceramic capacitor: These are the disk-type ceramic capacitors. Because the high frequency characteristic is good, these are used as the coupling capacitors (It cuts the direct current but it lets through the alternating current. Figure:26 10.Electrolytic Capacitor: This capacitor is used as the ripple filter capacitor of the power circuit. There is polarity. So, be careful so as not to make a mistake when mounting it. Figure:27 Electrolyte Capacitor Figure:28 Metallised Polyester Film Capacitors With tolerance of 10%. Operating temperature -40oC to +85oC. Compact Size Non Inductive Design 11.RESISTANCE Resistance is the opposition of a material to the current. It is measured in Ohms ( -). All conductors represent a certain amount of resistance, since no conductor is 100% efficient. To control the electron flow (current) in a predictable manner, we use resistors. Electronic circuits use calibrated lumped resistance to control the flow of current. Broadly speaking, resistor can be divided into two groups viz. fixed adjustable (variable) resistors. In fixed resistors, the value is fixed cannot be varied. In variable resistors, the resistance value can be varied by an adjusteknob. It can be divided into (a) Carbon composition (b) Wire wound (c) Special type. The most common type of resistors used in our projects is carbon type. The resistance value is normally indicated by colour bands. Each resistance has four colours, one of the band on either side will be gold or silver, this is called fourth band and indicates the tolerance, others three band will give the value of resistance (see table). For example if a resistor has the following marking on it say red, violet, gold. Comparing these coloured rings with the colour code, its value is 27000 ohms or 27 kilo ohms and its tolerance is  ±5%. Resistor comes in various sizes (Power rating). The bigger, the size, the more power rating of 1/4 watts. The four colour rings on its body tells us the value of resistor value as given below. COLOURS CODE Black 0 Brown 1 Red 2 Orange 3 Yellow 4 Green 5 Blue 6 Violet 7 Grey 8 White 9 Figure:29 The first rings give the first digit. The second ring gives the second digit. The third ring indicates the number of zeroes to be placed after the digits. The fourth ring gives tolerance (gold  ±5%, silver  ± 10%, No colour  ± 20%). In variable resistors, we have the dial type of resistance boxes. There is a knob with a metal pointer. This presses over brass pieces placed along a circle with some space b/w each of them. Resistance coils of different values are connected b/w the gaps. When the knob is rotated, the pointer also moves over the brass pieces. If a gap is skipped over, its resistance is included in the circuit. If two gaps are skipped over, the resistances of both together are included in the circuit and so on. 12.The 555 TIMER Description The LM555/NE555/SA555 is a highly stable controller capable of producing accurate timing pulses. With a monostable operation, the time delay is controlled by one external resistor and one capacitor. With an astable operation, the frequency and duty cycle are accurately controlled by two external resistors and one capacitor. Figure:30 Features à ¢Ã¢â€š ¬Ã‚ ¢ High Current Drive Capability (200mA) à ¢Ã¢â€š ¬Ã‚ ¢ Adjustable Duty Cycle à ¢Ã¢â€š ¬Ã‚ ¢ Temperature Stability of 0.005%/ ½Ã‚ °C à ¢Ã¢â€š ¬Ã‚ ¢ Timing FromÃŽÂ ¼Sec to Hours à ¢Ã¢â€š ¬Ã‚ ¢ Turn off Time Less Than 2ÃŽÂ ¼Sec Applications à ¢Ã¢â€š ¬Ã‚ ¢ Precision Timing à ¢Ã¢â€š ¬Ã‚ ¢ Pulse Generation à ¢Ã¢â€š ¬Ã‚ ¢ Time Delay Generation à ¢Ã¢â€š ¬Ã‚ ¢ Sequential Timing Pin Description of 555 Timer Figure:31 Power supply: Pin 8 is used to connect the positive power supply (Vs) to the 555. This can be any voltage between 3V and 15V DC, but is commonly 5V DC when working with digital ICs. Pin 1 is the 0V connection to the power supply. Trigger and Reset Inputs: Pin 2 is called the trigger input as it is this input that sets the output to the high state. Pin 4 is called the reset input as it is this input that resets the o/p to the low state. Both pins may be connected to push buttons to control the operation of the 555.Sometimes the reset input is not used in a circuit, in which case it is connected directly to Vs to that unwanted resetting cant occur. Threshold and discharge: Pins 6 and7 (and sometimes the Trigger i/p, pin2) are used to set up the timing aspect of the 555 IC. They are normally connected to a combination of resistors and a capacitor. Offset: Pin 5 can be used to alter the timing aspect of the 555 IC in applications such as frequency modulation. Output: Pin 3 is the digital output of the 555.It can be connected directly to the inputs of other digitaICs, or it can control other devices Figure:32 When the low signal input is applied to the reset terminal, the timer output remains low regardless of the threshold voltage or the trigger voltage. Only when the high signal is applied to the reset terminal, the timers output changes according to threshold voltage and trigger voltage. When the threshold voltage exceeds 2/3 of the supply voltage while the timer output is high, the timers internal discharge Tr. turns on, lowering the threshold voltage to below 1/3 of the supply voltage. During this time, the timer output is maintained low. Later, if a low signal is applied to the trigger voltage so that it becomes 1/3 of the supply voltage, the timers internal discharge Tr. turns off, increasing the threshold voltage and driving the timer output again at high. Fig 33 :Monostable Operation Figure:34 Figure 34. illustrates a monostable circuit. In this mode, the timer generates a fixed pulse whenever the trigger voltage falls below Vcc/3. When the trigger pulse voltage applied to the #2 pin falls below Vcc/3 while the timer output is low, the timers internal flip-flop turns the discharging Tr. off and causes the timer output to become high by charging the external capacitor C1 and setting the flip-flop output at the same time. The voltage across the external capacitor C1, VC1 increases exponentially with the time constant t=RA*C and reaches 2Vcc/3 at td=1.1RA*C. Hence, capacitor C1 is charged through resistor RA. The greater the time constant RAC, the longer it takes for the VC1 to reach 2Vcc/3. In other words, the time constant RAC controls the output pulse width. When the applied voltage to the capacitor C1 reaches 2Vcc/3, the comparator on the trigger terminal resets the flip-flop, turning the discharging Tr. on. At this time, C1 begins to discharge and the timer output conver ts to low. In this way, the timer operating in the monostablerepeats the above process. Figure 10 shows the general waveforms during the monostable operation. It must be noted that, for a normal operation, the trigger pulse voltage needs to maintain a minimum of Vcc/3 before the timer output turns low. That is, although the output remains unaffected even if a different trigger pulse is applied while the output is high, it may be affected and the waveform does not operate properly if the trigger pulse voltage at the end of the output pulse remains at below Vcc/3 Fig 35 :Astable operation An astable timer operation is achieved by adding resistor RB to Figure 1 and configuring as shown on Figure 5. In the astable operation, the trigger terminal and the threshold terminal are connected so that a self-trigger is formed, operating as a multi vibrator. When the timer output is high, its internal discharging Tr. turns off and the VC1 increases by exponential function with the time constant (RA+RB)*C. When the VC1, or the threshold voltage, reaches 2Vcc/3, the comparator output on the trigger terminal becomes high, resetting the F/F and causing the timer output to become low. This in turn turns on the discharging Tr. and the C1 discharges through the discharging channel formed by RB and the discharging Tr. When the VC1 falls below Vcc/3, the comparator output on the trigger terminal becomes high and the timer output becomes high again. The discharging Tr. turns off and the VC1 rises again. In the above process, the section where the timer output is high is the time it takes for the VC1 to rise from Vcc/3 to 2Vcc/3, and the section where the timer output is low is the time it takes for the VC1 to drop from 2Vcc/3 to Vcc/3. When timer output is high, the equivalent circuit for charging capacitor C1 is as follows Fig 36 :Astable operation Waveform 12.Diode The simplest semiconductor device is made up of a sandwich of P-type semiconducting material, with contacts provided to connect the p-and n-type layers to an external circuit. This is a junction Diode. If the positive terminal of the battery is connected to the p-type material (cathode) and the negative terminal to the N-type material (Anode), a large current will flow. This is called forward current or forward biased. If the connections are reversed, a very little current will flow. This is because under this condition, the p-type material will accept the electrons from the negative terminal of the battery and the N-type material will give up its free electrons to the battery, resulting in the state of electrical equilibrium since the N-type material has no more electrons. Thus there will be a small current to flow and the diode is called Reverse biased. Thus the Diode allows direct current to pass only in one direction while blocking it in the other direction. Power diodes are used in concerting AC into DC. In this, current will flow freely during the first half cycle (forward biased) and practically not at all during the other half cycle (reverse biased). This makes the diode an effective rectifier, which convert ac into pulsating dc. Signal diodes are used in radio circuits for detection. Zener diodes are used in the circuit to control the voltage. Figure:37 Some common diodes are:- 1. Zener diode. 2. Photo diode. 3. Light Emitting diode. ZENER DIODE:- A zener diode is specially designed junction diode, which can operate continuously without being damaged in the region of reverse break down voltage. One of the most important applications of zener diode is the design of constant voltage power supply. The zener diode is joined in reverse bias to d.c. through a resistance R of suitable value. PHOTO DIODE:- A photo diode is a junction diode made from photo- sensitive semiconductor or material. In such a diode, there is a provision to allow the light of suitable frequency to fall on the p-n junction. It is reverse biased, but the voltage applied is less than the break down voltage. As the intensity of incident light is increased, current goes on increasing till it becomes maximum. The maximum current is called saturation current. LIGHT EMITTING DIODE (LED):- When a junction diode is forward biased, energy is released at the junction diode is forward biased, energy is released at the junction due to recombination of electrons and holes. In case of silicon and germanium diodes, the energy released is in infrared region. In the junction diode made of gallium arsenate or indium phosphide, the energy is released in visible region. Such a junction diode is called a light emitting diode or LED. LIST OF INSRUMENTS TOOLS TOOLS: Soldering Iron Tweezers Screw Driver Cutter De Soldering Pump INSTRUMENTS: Digital Multimeter OTHER MATERIALS: Solder Flux De Soldering Wick Soldering Iron Stand Image of project Figure:38 Applications: 1.Electronic Jam Is Commonly Used In Quiz Contests Figure:39 2.Finger First Is The Basic Principle 3.It Adds Beauty To Active Quiz Shows Contains Many Buzzer Rounds 4.Inputs Can Be Handle At A Time Figure:40 5.Uses Seven Segment Display Instead of LED/bulb For Visual Interface 6.This Electronic Jam Is Built With The View Of Making The Game Show Priority Less Advantages: Handy device Low power consumption More accurate Easy to use Visual interface adds its advantage Disadvantages: Input is limited to eight. Future scope: Instead of Seven Segment display LCD screens can be implemented Priority list of all inputs can be imparted in Output Conclusion: Project Aims the Implemenatation of Electonic Jam for making Quiz shows priority Less Seven Segment display included for more User nterface Cost of Project: S.No. Component Quantity Cost 1. IC74373 1 60 2. IC 555 1 30 3. IC 7430 1 60 4. IC 7447 1 35 5. IC 74147 1 65 6. IC7400 1 24 7. IC7404 1 20 8. Transistor 1 3 9. Diode 2 4 10. 7 segment display 1 20 11. Transformer 1 40 12. Ceramic Capacitor 2 4 13. Electrolytic Capacitors 1 5 14. Resistor 18 40 15. PCB designing 600 16. Misc(Solder wire, connecting wire, Connectors etc) 200 Total 1210

Wedding Toasts to the Bride and Groom :: Wedding Toasts Roasts Speeches

Wedding Toasts to the Bride and Groom The Upper Hand The following tidbit began a wonderful and personal toast to the bride and groom: "John, take Emily's hand and place your hand over her's. Now, remember this moment and cherish it... because this will be the last time you'll ever have the upper hand!" Toilet Roll Let us all hope and pray that your married life is like this toilet roll - soft, strong and ever so long. Never Lie, Cheat, and Drink May you never lie, cheat or drink. But if you must lie, lie with each other. And if you must cheat, cheat death. And if you must drink, drink with us for we all love you and wish you both the love and happiness of which you deserve. Let Us Toast Let us toast the health of the bride, let us toast the health of the groom, let us toast the priest who tied. And I'd personally like to toast every guest in the room." Swear, Steal, Lie May you swear, steal, and lie. Swear by all that's good and true. Steal away your cares and sorrows. And lie in the arms of the one you love. Live as long as you want May you both live as long as you want and never want as long as you live. Today's Love May the love you express to each other today, always be the first thoughts during any trying times in the future. Love that Grows I see the love you both have in each other's eyes and as your love grows for one another, may you look back on this day and know this is when you loved each other the least. Leave It To The Expert I'll be toasting the bride and groom with Shakespeare's sonnets. Shakespeare's sonnet 18 for the bride Shall I compare thee to a summer's day? Thou art more lovely and more temperate: Rough winds do shake the darling buds of May, And summer's lease hath all too short a date: Sometime too hot the eye of heaven shines, And often is his gold complexion dimm'd; And every fair from fair sometime declines, By chance or nature's changing course untrimm'd; But thy eternal summer shall not fade Nor lose possession of that fair thou owest; Nor shall Death brag thou wander'st in his shade, When in eternal lines to time thou growest: So long as men can breathe or eyes can see, So long lives this and this gives life to thee. Shakespeare's sonnet 53 for the groom

Ulysses Alighieri Essays -- Dante Inferno Essays

Ulysses Alighieri In Dante’s â€Å"Inferno†, among many other sins, in Canto XXVI the â€Å"counselors of fraud† are being punished. These people are being constantly consumed by flames, and more importantly, as Dante points out, are forced to speak through the â€Å"tongues† or fire, which pains them greatly. This follows Dante’s idea of punishment that is the same as the sin -- just as they spoke falsely at ease, they should have great difficulty speaking now. The most prominent man in this bowge is a legendary figure -- Ulysses. The description of his sin, which Dante creates for Ulysses, is an account that conflicts with some of the previous works about him, like Homer’s, so we are forced to assume that Dante’s Ulysses is completely, save for his name, the author’s creation. The beginning of Canto XXVI is Dante’s reproach to the people of Florence, whom he places in almost all layers of Hell. Dante uses irony in his reproach: â€Å"Florence, rejoice, because thy soaring fame / Beats its broad wings across both land and sea, / And all the deep of Hell rings with thy name!† (Canto 26, 1-3), but after these few lines of insulting his fellow citizens, he completes the Canto without mention of any Flourentines. There can be many interpretations to this fact, and one of them is that Dante wanted to show that evil in men has existed since much earlier times, and it is not only their generation of Florentines that goes to Hell, but many legendary figures from other great nations as well. Also I believe Dante is also trying to have all sides â€Å"represented† in Hell -- the Italians, as well as their legendary enemies -- the Greeks who conquered Troy, and tried to destroy their ancestors. However Ulysses is not placed with Brutus into the m outh of ... ...by his utter shame in his position, for in the next Canto, another â€Å"flame†, Guido da Montefeltro, is very anxious to speak to the poet. I think that Ulysses does not talk freely because he does not completely deserve to be punished for his sin, since he did not fully intend to fool his crew into killing them, but rather he was driven by the desire for good, for searching out a new way, which Dante holds in high esteem, but he accomplishes this through sin, and must therefore be punished. He is therefore reluctant to speak of his sin, for he believes there was none. I believe that in part of Ulysses, Dante is trying to see himself, with the difference that Ulysses strives for the exploration of the forbidden, while Dante strives for the exploration of the divine and righteous, but otherwise the same, with the same desire to explore previously untouched territory.

The Power of the Witches in Shakespeares Macbeth Essay -- Macbeth e

The Power of the Witches in Shakespeare's Macbeth    The tragedy of Macbeth comes about because of a single event in his life. If that one moment, the meeting with the witches on the heath, had not happened then Macbeth would no doubt have gone on to be a loyal and respected subject of King Duncan and, later, King Malcolm. However, the meeting did happen and the powerful force of ambition was unleashed within Macbeth and Lady Macbeth. It is the combination of these two factors, the meeting with the witches and Macbeth's own inner demons, that lead to tragedy, and make the play 'terrifying' in the Aristotelian sense. The three witches are certainly responsible for initiating the events that lead to Macbeth's tragedy. Their greeting to him All hail, Macbeth! Hail to thee thane of Glamis! All hail, Macbeth! Hail to thee, thane of Cawdor! All hail Macbeth! That shalt be king hereafter! feed straight into his desire for advancement. At this point in the play he is the newly appointed thane of Glamis but assumes that the thane of Cawdor still lives. When news arrives that he is to be the new thane of Cawdor, Macbeth sees the second greeting as a prediction and cannot help but wonder whether the third greeting will also prove accurate. Banquo says that the forces of darkness use the truth to win us to harm but Macbeth is unsure.    This supernatural soliciting cannot be good, Cannot be ill.    For the audience there is even more to think about. They know from the conversation about the sailor whose wife had offended one of them that the witches' power is circumscribed.    They can torment him but not change his fate. Though his bark cannot be lost Yet it shall ... ...with witches, partly to flatter the witch-hating James I and partly to introduce an exciting flavour of the supernatural into the play. But, exciting as the scenes with the witches and Hecate are, they are not at the heart of the tragedy. The witches' powers are limited, Lady Macbeth is only a helper: it is Macbeth's own weaknesses that bring him down.    Works Cited and Consulted: Greenblatt, Stephen. "Introduction to Macbeth." The Norton Shakespeare. New York: Norton, 1997. 2555-63. Hawkins, Michael. "The Witches and Macbeth." Focus on Macbeth. Ed. John Russell Brown. London: Routledge, 1982. 155-88. Kermode, Frank. "Introduction to Macbeth." The Riverside Shakespeare. Boston: Houghton, 1974. 1307-11. Shakespeare, William.   Tragedy of Macbeth . Ed. Barbara Mowat and Paul  Ã‚   Warstine. New York: Washington Press, 1992.  Ã‚  Ã‚     Ã‚  Ã‚  Ã‚  Ã‚  

Boys&Girls Club

The Boys & Girls Club has opened my eyes to many opportunities. This is a safe place where parents can drop off their children or child when they have to go to work. Every day after school I go the Boys & Girls and I have so many things I could do. Such as playing sports in the gym, and even swim in the indoor swimming pool. The Boys &Girls club has a teen center where I always have someone to talk to like friends, counselors, even staff members.I have been a member of the Boys & Girls club since the third grade. I used to like coming to the club but now I love it even more. The club is where I can study and do my homework. I have many interests I’m involved with such as the torch club, mentoring, and previously in apprentice. These activities help me get involved with the community as I grow up. For example the torch club helps me keep the earth clean by recycling, helping the elderly, and giving food and other items needed by people.The mentoring program helps me improve my learning skills for any subject. They help with homework, tests, quizzes, and have fun with you like a best friend. The club means a lot to me as you can see and I’m pretty sure other kids think the same way. I think I am very lucky to be part of the club. I will always keep the club in my heart because their like my second family. I have been a member for 5 years and I think this place is sweet. The club is a great place to be. That’s what the Boys & Girls club means to me.

Lucy, by Jamaica kincaid

There are a lot of ways of reading this novel. It could be read, somewhat conventionally, with focus on Lucy, people and places. But if we look into the deep, we’ll see well-marked psychological picture of the young woman, her everyday struggle with herself. In â€Å"Lucy†, Jamaica Kincaid challenges the idea of passive/pathological sexuality in women. Lucy's deepest conflicts and her greatest anger arise from her relationships with her mother and then with her substitute mother, Mariah. Her own family seems fragmented, and in some sense her island community does, as well. The novel itself, however, does seem to connect mother and motherland–the island. That may explain somewhat the intensity of her anger and feeling of suffocation. Her rage against her mother is not simply psychological, an especially strong version of the usual parent-child conflict. Lucy’s relationship to her mother is highly complex; she has very ambivalent feelings about her. She is cruel to her, but also loves her deeply; she hates her and admires her at the same time. Although Lucy constantly discusses her anger toward her mother and Annie’s inadequacy and failure as a mother, she also peppers the novel with tender stories of their interactions. â€Å"I reminded her that my whole upbringing had been devoted to preventing me from becoming a slut.† it is one lesson, which mother gave to Lucy. Lucy describes her mother’s large hands, and her love of plants; she tells us of Annie’s lessons to Lucy about sex, men, and abortion, and of sitting on Annie’s lap as a child and caressing her face. Lucy also proudly shares stories of her mother’s life and her various triumphs. Despite Lucy’s anger toward her mother, she still feels a deep connection to her and identifies with her in many ways. Until she was nineteen years old, Lucy Potter had not ventured from her own little world on the small island where she was born. Now she is living with a family and learning a culture that is very different from her own. Lewis and Mariah and their four daughters want Lucy to feel like she is part of the family but at first she finds it difficult to fit in. She just wants to do her duty and in her off-hours discovers a new world through her friend Peggy and sexuality through young men, Hugh and Paul. Lucy often reflects on her life back on the island; the conflicts between she and her mother, and the British influence on the islanders. She remembers the time her mother showed her how to mix herbs that supposedly would cleanse a woman's womb but what they both knew was an abortion remedy. Lucy knows what is expected of her, to study for a respectable job like a nurse and to honour her family. She finds out that the tidy, neat world of the family she has come to love is not all it purports to be and how silence is a universal language. Lucy comes to North America to work as an au pair for Lewis and Mariah and their four children. Lewis and Mariah are a thrice-blessed couple–handsome, rich, and seemingly happy. Yet, almost at once, Lucy begins to notice cracks in their beautiful facade. With mingled anger and compassion, Lucy scrutinizes the assumptions and verities of her employers' world and compares them with the vivid realities of her native place. Lucy has no illusions about her own past, but neither is she prepared to be deceived about where she presently is. At the same time that Lucy is coming to terms with Lewis's and Mariah's lives, she is also unravelling the mysteries of her own sexuality. Gradually a new person unfolds: passionate, forthright, and disarmingly honest. Lucy leaves the novel crying with shame over her wish to â€Å"love someone so much that I would die from it.† Lucy does love someone that much, but she has thrown that love away because she could not adequately create a space for herself within it. When her mother tells her â€Å"You can run away, but you cannot escape the fact that I am your mother, my blood runs in you, I carried you for nine months inside me,† Lucy interprets that as a prison sentence. â€Å"To myself I then began calling her Mrs. Judas, and I began to plan a separation from her that even then I suspected would never be complete.†   Yet this is a prison sentence that all human beings must face, and Lucy’s way of dealing with it leaves her empty and ashamed at the end of the novel. Indeed, she states, â€Å"I was now living a life I had always wanted to live. I was living apart from my family†¦ The feeling of bliss, the feeling of happiness, the feeling of longing fulfilled that I had thought would come with this situation was nowhere to be found inside me.†