Flexible capacitor size
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NecroDavid 1 week ago
Hello guys, I am designing a PCB for an H bridge inverter with an interrupter to adjust duty cycle. The circuit requires a lot of MKP capacitors, but it's very hard to determine if the size/package of these capacitors will match the packaging on the PCB designer, because they come in various sizes. Is there a way to create a PCB package that has multiple pads of different distances to allow different capacitor size options? Project: [https://easyeda.com/ss4c0001/h-bridge-inverter](https://easyeda.com/ss4c0001/h-bridge-inverter) ![Capture.JPG](//image.easyeda.com/pullimage/E21Iln2rrLd5X1zG0bZgeo7kJ5T0fsrYf2LX8k3g.jpeg)
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andyfierman 1 week ago
From your picture, you are using twin pinned caps, two pins at one end  connected together to one plate and two pins at the other end connected together to the plate. Rule One in Footprints is that all copper must be made using pads. Do not use solid regions or track within the Footprint because that generates DRC errors. Make a Footprint with two multi-layer pads both numbered "1" at one end. Copy them, paste them into the positions required for the other end for the smallest capacitor (or the largest: it doesn't matter). Renumber both pads to be numbered "2". Copy and paste them to the locations of for the other sizes of capacitors. If you want both "1" pads and all the "2" pads to be connected together as part of the footprint then overlay them with a Top (and/or if desired a Bottom) Layer pad also numbered "1" or "2" as required. For thinner joins between the multi-layer pads, use several Top or Bottom Layer pads, all numbered as "1" or "2" as appropriate, to join the multi-layer pads. Then draw a suitable silkscreen outline to indicate the different possible sizes that can be fitted.
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andyfierman 1 week ago
More: [https://easyeda.com/forum/topic/How-to-avoid-DRC-errors-when-connecting-to-PCB-Footprints-a-k-a-PCB-Libs-90bf944fe3644b21a7d27a9e9d8df8d6](https://easyeda.com/forum/topic/How-to-avoid-DRC-errors-when-connecting-to-PCB-Footprints-a-k-a-PCB-Libs-90bf944fe3644b21a7d27a9e9d8df8d6)
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NecroDavid 1 week ago
@andyfierman The picture is not mine and I am not using twin pinned capacitors, but your suggestion seem helpful regardless of which type of capacitors. Thank you very much!
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andyfierman 1 week ago
@ss4c0001, Sorry but it wasn't clear from your schematic which caps you were referring to. This is an example of the techniques I was describing: ![image.png](//image.easyeda.com/pullimage/HkWJQG6zPuLsIqlP8mdH2r4MWlnU73Gypporb9Hn.png)
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NecroDavid 1 week ago
@andyfierman Thanks. By the way, I was referring to C1, C2 and C18-C25.
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