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555 Timer Practical.

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Introduction

555 Timer Practical                                                   Scenario: A chef requires an egg timer which sounds a buzzer. The buzzer needs to have an adjustable timer, so that different times can be set for the egg to boil.   Method: To make an egg timer I will need to make a 555 timer with a variable resistor to adjust the time set for the egg to boil In order to do this experiment, I will need the following components to make the timer: > 9 volt battery > Battery Snap > Switch (s.p.s.t) > 2x 10k? Resistor > 0.1?F Capacitor > 1m? Potentiometer > 220?F Capacitor > 680? Resistor > Light Emitting Diode > Buzzer > PCB Board (Printed Circuit Board) > Connector Wires � Red and Black > 555 Timer + Holder The tools I will require while making the timer are a soldering iron and solder, a mini-pillar drill, and a sucker while making the Timer. I will also need 2 different sized drill-bits according to the size of the holes that I need to drill for the components to fit in. After I have collected my components, I will follow the following procedure: Making the PCB Board I will firstly remove the protective covering from the PCB Board. I will then lay the master circuit film onto the U.V Light box, aligning the PCB Boards on top. ...read more.

Middle

The battery sends an electrical charge to the processing components, such as the resistors, the 555 timers and the capacitor. The current flowing through the circuit fills the capacitor with a charge, and once it is full, it will release the charge. You can control the amount of charge flowing through the circuit using a potentiometer. By using the potentiometer, you can increase or decrease the resistance flowing through the circuit, meaning it will take more time to fill the charge in the capacitor, and increase the time for the buzzer to go off, and the L.E.D to be turned on. Once the charge is full the capacitor releases the charge and the outputs are activated. In this case these are the L.E.D and the buzzer. Below is a table showing the list of components, showing what they do and their electrical symbol. Name of component Component Diagram What the component does 555 timer The 555 timer is an integrated circuit. It contains a very small circuit built onto a piece of silicon. The timer can be used in two different ways, monostable and astable. Buzzer Gives off a sound when turned on to alert a person on something. Resistor Resistors resist or restrict the flow of electricity, measure in ohms Potentiometer Also known as variable resistors. They can stop the flow of electricity, or allow a small amount to trickle through, or allow a full flow. This can be adjusted with a knob on top Capacitor A capacitor is a component that fills up when the circuit is turned on. ...read more.

Conclusion

In industry, the PCB Boards would be made by using machines. They would have computers to control, the U.V light given to the boards, and would be put in a computer controlled etching tank. Machines would drill all the holes in the PCB Boards, and they would be produced in a very large amount. Companies would hire only the best electricians who specialise in soldering to solder the components to the PCB Boards. Major electrical companies might have machines to solder and add components to the PCB Boards, but most companies hire electricians specialising in soldering. The PCB Boards made in industry would also be very small. Some of the circuits produced are very small in order save space for other boards or components in a device. However the PCB board being very small is not always an advantage. If the boards are small, they will heath up more faster as the components are closer together, and this also means that there will be more resistance in the circuit, which could result to a device not being able to function properly. This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ ...read more.

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