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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I assume you mean that you want a separate display for the - sign.
If so, just modify what I suggested so that the g output of IC1 drives the g segment of the third display.
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