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Custom Library and Symbols Design

AVSnap provides a simple way to create custom symbol libraries.  All commands within the AVSnap are the same as you move from the Project Mode to the Library mode. We recommend that you use keyboard shortcuts us much as possible to increase speed with which you can design new symbols.

The keyboard shortcuts are displayed by pressing "F1" while in AVSnap. More detailed explanation of each shortcut is also located in the AVSnap user guide.

From File menu select "New Library".

The AVSnap will switch into "LIbrary Mode" and a new "Untitled" library will be created with two symbols automatically inserted into the library.

The first symbol is the "Header Symbol" for the library and it will always appear at the top of the library viewer pane. This symbol has a pre-defined text that can be adjusted by user. The second symbol is shown empty and that is where the new symbol can be created or it can be deleted and a new symbol added.

The text in the "Header Symbol" can be modified  by double clicking on the text object in the Design Window. to enter the Library Name, Date, Manufacturer name and Revision letter. The text box can be extended to fit typed text properly. The font and text size can also be adjusted.

In the Properties tab, several fields can be filled out to help in creation of consequent symbols. This step is critical since it will make creation of other symbols very simple.

The highlighted fields in the first symbol in the library will be copied automatically to other symbols created in the library. It is important to leave the Model Number field open in the first symbol. Since all symbols in the library are arranged alphabetically by Model Number, modifying this field in the first symbol, may move it to a different position in the library.

The Designator field allows user to automatically assign designator to each symbol placed on the sheet during the project design phase. Typically the designator field consist of 1 to 5 letters. For example for an amplifier the designator may be AMP, for switchers SW, for Mixers MX and so on. When symbols are added to design page, symbols with the same designators will have number appended to them. For example if two symbols with the AMP designators are added to the design sheet, first symbol will be automatically numbered as AMP1 and the second symbol as AMP2. This will also happen if symbols are copied or pasted on a page. This will be significant later when the List of Materials or List of Cables is required.

Now that we are done with the "Header Symbol" it is time to create a symbol that we can use in our designs.

Every Model Number in AVSnap can have several symbol types associated with the same model number. Different symbol types can be used to create system diagrams, product photos, physical layout of components, or for creating symbol in Metric Units. When a symbol is created, select the type of symbol by checking one of the selections on the Property Tab. In the Project Mode, library view in the Library View pane can be filtered using '/' shortcut key to show only specific type of symbols.

 

When a new symbol is created, the Origin object is placed on the middle of the page. The Origin object can be used as an aid to place snap points at the precise point on the page. Also Origin object can be used to measure the distance from the Origin object to the mouse position, it can also be used for rotating objects, and mirroring objects. It is also used as the snap point when symbol is placed on a project page. Typically Origin object is placed on one of the snap points.

First decide if you wan to draw your symbol or to insert .BMP or .JPG image. If you insert a large bitmap image and then size it down, use Resample option to keep your library small and fast.

Once your symbol is drawn or image is inserted it is time to add some smarts to the input and output pins.

 

The key in creating a useful symbol is to add Snap Points. Snap Points identify place where cables get connected and where symbols can snap together. Each snap point has number and associated properties. The Snap Point number is assigned sequentially when Snap Point is placed on the symbol. Select Snap Point tool and place 6 snap points on the symbol.

 

 

Double clicking on any Snap Point allows easy property settings. Properties include Connector type and Signal type. There are many connector types that can be selected. This should match physical connectors available on the product. Signal type can be Input, Output or Bi-Directional.

Once Snap points are assigned the symbol is ready to use. Additional symbols can be created by duplicating existing symbol, copying symbols from other libraries or by creating a new symbol from scratch.

The final step is to save the library on the disk. No you can start a new project and add this library to the list of libraries on the right of your screen. To use the symbol, drag it from the library and drop it on the active project page.

 

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