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A schematic, or schematic diagram, is a designed representation of the elements of a system using abstract, graphic symbols rather than realistic pictures. A schematic usually omits all details that are not relevant to the key information the schematic is intended to convey, and may include oversimplified elements in order to make this essential meaning easier to grasp, as well as additional organization of the information.

For example, a subway map intended for passengers may represent a subway station with a dot. The dot is not intended to resemble the actual station at all but aims to give the viewer information without unnecessary visual clutter. A schematic diagram of a chemical process uses symbols in place of detailed representations of the vessels, piping, valves, pumps, and other equipment that compose the system, thus emphasizing the functions of the individual elements and the interconnections among them and suppresses their physical details. In an electronic circuit diagram, the layout of the symbols may not look anything like the circuit as it appears in the physical world: instead of representing the way the circuit looks, the schematic aims to capture, on a more general level, the way it works. This may be contrasted with a wiring diagram, which preserves the spatial relationships between each of its components.

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A semi-schematic diagram combines some of the abstraction of a purely schematic diagram with other elements displayed as realistically as possible, for various reasons. It is a compromise between a purely abstract diagram (e.g. the schematic of the Washington Metro) and an exclusively realistic representation (e.g. the corresponding aerial view of Washington).

In electrical and electronic industry, a schematic diagram is often used to describe the design of equipment. Schematic diagrams are often used for the maintenance and repair of electronic and electromechanical systems.[1] While schematics were traditionally drawn by hand, using standardized templates or pre-printed adhesive symbols, today electronic design automation software (EDA or "electrical CAD") is often used.

In electronic design automation, until the 1980s schematics were virtually the only formal representation for circuits. More recently, with the progress of computer technology, other representations were introduced and specialized computer languages were developed, since with the explosive growth of the complexity of electronic circuits, traditional schematics are becoming less practical. For example, hardware description languages are indispensable for modern digital circuit design.

Schematics for electronic circuits are prepared by designers using EDA (electronic design automation) tools called schematic capture tools or schematic entry tools. These tools go beyond simple drawing of devices and connections. Usually they are integrated into the whole design flow and linked to other EDA tools for verification and simulation of the circuit under design.

In electric power systems design, a schematic drawing called a one-line diagram is frequently used to represent substations, distribution systems or even whole electrical power grids. These diagrams simplify and compress the details that would be repeated on each phase of a three-phase system, showing only one element instead of three. Electrical diagrams for switchgear often have common device functions designate by standard function numbers. Another type of diagram used for power systems is a three-line diagram.

For analysis purposes of a power system, from the one-line diagram, if the system is balanced, an equivalent per-phase (or single-phase) schematic diagram can be obtained. If all of the parameters are represented as impedances and voltage sources, the equivalent per-phase schematic diagram is called an impedance diagram. If all of the parameters are represented as admittances and current sources, the equivalent per-phase schematic diagram is called an admittance diagram.

If the power system is unbalanced, but it is linear (or can be approximated by a linear system), then Fortescue's theorem (symmetrical components) can be applied. In this way, from the one-line diagram, three different per-phase schematic diagrams are obtained, known as sequence diagrams: positive sequence diagram, negative sequence diagram, and zero sequence diagram. Each of these diagrams can be represented as an impedance diagram or as an admittance diagram.

Schematic diagrams are used extensively in repair manuals to help users understand the interconnections of parts, and to provide graphical instruction to assist in dismantling and rebuilding mechanical assemblies. Many automotive and motorcycle repair manuals devote a significant number of pages to schematic diagrams.

There are some (I think at least 2 different) projects that are made to extract pinout data from datasheets and make KiCad symbols from them. If you have complex hand made parts in your old schematic (>100 pins) then that may be worth looking into. But the schematic symbols are not saved in the schematic itself, so if you made such, then they are probably still in a schematic symbol library.

You are right - I should have tried it right away. I renamed the only file with a .bak extension in the folder containing all the files pertinent to this project - to .sch - and opened it. Unfortunately, what appears again is the blank/starting eeschema screen. The folder contains a .pro file and - particularly frustrating - a saved.pro file. Both of those are about 1kb in size. What should I see if I open those files? None of the files in the folder is big enough to be a schematic - typically, 1kb or less. The only file big enough was the pdf file made months ago - before the schematic was extensively edited. I appreciate your assistance.

Running the plugin lays out component footprints in Pcbnew in the same spatial pattern as their corresponding components in the schematic. Hierarchical sheets are laid out one after another down the page in non-overlapping areas.

Note that the footprint organisation produced by this script is intended only to aid with keeping track of where everything is at the very start of component placement. For example, if you have a large number of decoupling capacitors for a component, you can place them near to the component in the schematic and the plugin will move them to be near to the component in the layout too. Another example where this might be useful is for analog sections where it might be useful to mirror signal flow and component placement on the schematic in an initial view of the PCB layout.

I'v browsed internet for that kind of problem, it was amazing to see that it is a "common" Cadence software problem for Capture schematic to be gone like that, and typical workaround is to add .dsn file by hand and it should work.

I'm trying to clean up some old schematics that drew parts from different locations, and hence have different formatting. I'm running into issues with how to make changes to entire pages or the whole design. The fixes are easy part by part, but there are hundreds of them. Many options seem to be unavailable when using the search function, like setting property visibility.

1. You need to visit each page and make the required property visible. If this is a future requirement, you can make the property visible in the library part and then it will always be visible within the schematics, you can use the visible "Placeholder" to locate the position of the displayed property..

5. It is not possible to have "empty" Schematic level properties, any properties added to a schematic without a value will be automatically removed. IF you have "Current Properties" that are empty, these likely came from "Placeholders" added to the library part because it is possible for a library part to have a property attached without a value.

Is there no similar way to export displayed properties for an instance of a part? I was hoping for some way to export all of the lines/text that make up the schematic symbol along with the pin locations/properties, displayed properties with their settings and position, and part location on the schematic. That would let me script changes to virtually all aspects of the schematic. But if that doesn't exist, I'll just have to work around it.

The above schematic from Firesledge is probably overly cautious about input protection, with Schottky diodes D1 and D2. I worry that their reverse leakage current could cause the op amp output to not stay at the 4.5V virtual ground, given the high DC impedance. It probably still works, but the headroom will be reduced. The low-pass caused by C8 to ground is 159KHz only if the upstream device is low impedance. A guitar pickup is not. I would nix C8 altogether. Also, it is best practice to have a large (say 2Meg) resistor to ground directly on the input. This eliminates the possibility of a pop if this circuit is wired up to a true bypass stomp switch. Then again C7 is small enough that it will not be severe. On the output, C14 should be way bigger than 100n. Best practice is that guitar pedals should have low output impedance, just in case they are not driving another high impedance pedal or amplifier input.

You can do something very similar to what you want, if you create your design using hierarchical blocks. Imbedd your schematic into a hierarchical block, then when you select the block, all the parts in the schematic will highlight and move as a group.

Question for you, i can seem to crossprobe in reverse as easy, select a part in layout and zoom to the schematic page. the only whay I can make this work is select a function in the pcb like chage color, then select the symbol and then the schematic will zoom to the part.

Crossprobing works with the highlight/dehighlight tool. If you select a part in the schematic it will highlight the part in Allegro (it only works if there is no active command). If you highlight a part in Allegro it selects the part in the schematic. I haven't found a way to have it stick to the mouse as in the move function. It would be nice if it did work that way. ff782bc1db