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We do things a bit like that - we break things up in the schematic by page (between one and a couple of sub-circuits per page), and then the designator is page number plus a sequential ID. So you might have C405 (4th cap on page 4) or C847, etc.

We don’t print designators on silkscreen, so it’s not really a problem with the length (e.g when you get over 10 pages and have a five or more digit long designator. With a page that is subclassed you might have one like R1208B for example!)

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