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I am drawing a schematics in Altium designer. I have several schematics (sheets) in my current project. Some of the components have already a designator numbers like R5, C20, L13 ... etc.

But some new components does not have yet, and it is like R?, C?, L? ...etc.

My question: How to make numbers to these new components ? Can one assign numbers to all these components at once ?

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    \$\begingroup\$ Tools->Annotate Schematic; And Tools->Board Level Annotate. Google or the Help function can tell you more. Too lazy to type it all out right now. \$\endgroup\$
    – Asmyldof
    Feb 26, 2016 at 13:00

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The easiest way to annotate just the new components is to go to Tools -> Annotate Schematics Quietly and click Yes.

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  • \$\begingroup\$ Is it possible to start annotation with a specific number for new components? For example, I have schematics with components and annotations on it, I added new components and I want annotation to start for example R300. \$\endgroup\$ Mar 17, 2022 at 16:38
  • \$\begingroup\$ @MubinIcyer you can set the start index. See here: altium.com/documentation/altium-designer/… \$\endgroup\$
    – Armandas
    Mar 18, 2022 at 11:10

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