Fabricating Printed Circuit Boards (Demystifying Technology) by Jon Varteresian

By Jon Varteresian

Jon Varteresian is proprietor of JV companies, an organization focusing on the layout and manufacture of revealed circuit forums. He deals a number of counsel and strategies from his years of expertise that warrantly a soft and painless computer board layout and fabrication method utilizing his step-by-step method. various illustrations and pictures show every one step of the method. issues lined within the booklet contain: issues of safety, schematic trap, circuit placement and routing, making published circuit forums, and plans for tasks. an intensive source record and word list also are provided.

*Gives an entire review of the published circuit board layout process
*Describes tips to produce revealed circuit forums in small amounts (ideal for prototypes), with an emphasis on safety
*Author is proprietor an organization focusing on the layout and manufacture of revealed circuit forums

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Extra info for Fabricating Printed Circuit Boards (Demystifying Technology)

Example text

For the purposes of nearly all circuit boards, your goal as a board de­ signer is to produce transmission lines of a known characteristic impedance. This will allow the circuit board to “match” to the components on it, resulting in a minimum of transmission line reflections. What is the dielectric constant (εr), you ask? It is a material property of the circuit board you have chosen to use, and it is usually outside of the board designer’s control. Nearly all (99%) of circuit boards are built on “FR-4” woven fiberglass circuit boards, including the ones used in this manual.

This can be a problem for the home hobbyist who has to swage or solder each via individually. The best thing that I can say about automatic placement and routing soft­ ware tools is that they have their place, but they should not be used carelessly. You know your design better than any piece of software. If you can place and route the board manually, then you should. The result will be a higher quality circuit board, and you will have thought and learned more both about your de­ sign and the design process.

Note also that the ground fill is removed in certain areas of the board. This is because, in those areas, the fill could not be connected to ground on that layer. If the ground fill were there, it would be an isolated island of metal, electrically connected to nothing on the board. This could be a severe board problem, since the “floating” metal area could act as a large an­ tenna or coupler, and cause noise or interference problems to the other circuits on the board. Special Routing Consideration: Power Power distribution can be as nearly as important as circuit board grounding, and most of the above comments apply equally to ground or power signals.

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