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Printed Circuit Boards.

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Introduction

Printed Circuit Boards Printed circuit boards were invented in the1930's and are used in a variety of electronic circuits. The uses range from simple one-transistor amplifiers to super computers. Printed circuit boards are a large part of technology in the modern world. They can be found in products such as cars, toys, TV's, computers, telephones, oven etc. In my report I am going to itemise and explain the process involved in producing a printed circuit board with the characteristics below. There are many methods to making printed circuit boards. The first method is a traditional manual method. It involves using subtractive techniques; this is where the excess copper layer is removed from a board coated in copper, therefore leaving the artwork exposed. This traditional method of making a printed circuit board involves six main stages. The first is drawing a schematic diagram of the circuit; this is the diagram to show the circuits components and how they are connected. The schematic diagram can be designed in many different ways, it can be drawn and designed by hand and then transfer the image onto the circuit board. ...read more.

Middle

The artwork would be printed onto a transparent film; a piece of overhead projector paper would also be suitable. The third step is to transfer an image of the artwork to a copper coated circuit board. The image that is to be transferred to the circuit board must be etch resistant in order for it not to react with the chemical solution used for etching the pattern. As with all aspects of making a printed circuit board, there are many methods available to use to transfer the image to the circuit board. The simplest is to apply rub-on or press on patterns directly to the copper. With the specific board type which is shown, the most suitable method is to use photographic techniques, which expose onto the board, and due to the layer of photo-sensitive etch resistant material the image will de develop on the board. This works by first peeling off the protective coating in a dim light, and then exposing the board, which has the transparency image in place on the board, and al fixed together using a glass plate, and then exposing the circuit board to ultra violet light. ...read more.

Conclusion

The board must be thoroughly rinsed and dried. If the board is made successfully then the layer of photo-resist must be removed. This can be done using acetone. After the etching process is complete then the printed circuit board is ready for drilling, where the board is drilled for component and mounting holes. Then soldering can be done, where the components are mounted onto the board and soldered to their pads. The printed circuit board is then ready for testing, installing and using. Printed circuit boards are provided and produced in many different stages, and each of these stages has many different construction offers. Making printed circuit boards can be cheap and quick but it can also be a long process and can be expensive. The methods explained for mass-production. Time is needed in designing the artwork, but this only needs to be designed once, whereas the other stages, such as transferring the image, drilling, soldering etc can be done using batch or assembly line methods, therefore the more boards you make, the less time is spent per board. Printed Circuit Assignment Product design BSc Applied technology Jeanette Griggs 20089227 ...read more.

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