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CIRCUIT DIAGRAM TO PCB LAYOUT 2

V. Ryan 2002

 

Below is an example of a 555 monostable timer circuit. When a circuit is designed it is first drawn on a piece of software that allows the components to be set out in the circuit. Software such as 'Crocodile Clips' is ideal for school use as it allows each component to be moved around the screen and testing of the circuit once it is complete. Once complete as a working circuit diagram it must then be converted into a printed circuit board layout (PCB). Normally the completed circuit diagram is imported into a second piece of software such as PCB Wizard which converts the diagram automatically.

Left is the monostable circuit drawn as a circuit diagram. Circuit diagrams are often easier to understand and follow. Some of the components have been labelled. If you compare the circuit diagram with the printed circuit board version (below it) one of the main differences is the numbering of the pins of the 555 IC. On a PCB these are always in order but this is not always the case for the circuit diagrams.

The PCB layout is set out in a slightly different way as the tracks are set in a more efficient layout, which saves space and expensive printed circuit board.

The animation (below) displays each stage of drawing a PCB layout for the circuit diagram.

 
   

555 MONOSTABLE CIRCUIT DIAGRAM

 
   

555 MONOSTABLE PCB LAYOUT

555 MONOSTABLE PCB LAYOUT- STAGE BY STAGE

   

   

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