Electronics > Beginners
Creating controller for LED display, help / review needed
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muktupavels:
I have updated both boards. In both boards I tried to use polygon for power, is that good or in this case traces was better? In USB to RS485 both shields are now connected to GND. How boards looks now?
Lt_Flash:
Now they look very nice to me! Good job putting these VCC polygons in and forming a good GND planes! You can extend VCC plane just a bit so it would connect directly to IC1 output and covering C15. Same with all component connections - you can just extend your VCC poly to cover all the contacts of resistors and capacitors, like R3,R5 and C5 can be covered by extended VCC poly instead of connecting them with a trace. And, as I said before, it would be even better if you'd use straight join instead of 3-point one.
muktupavels:

--- Quote from: Lt_Flash on May 11, 2018, 05:06:30 pm ---And, as I said before, it would be even better if you'd use straight join instead of 3-point one.

--- End quote ---

You mean thermals? From what I understand they are used to make soldering easier. If that really helps then I would prefer to keep them. I don't have good temperature controlled soldering iron.
Lt_Flash:

--- Quote from: muktupavels on May 11, 2018, 06:03:50 pm ---
--- Quote from: Lt_Flash on May 11, 2018, 05:06:30 pm ---And, as I said before, it would be even better if you'd use straight join instead of 3-point one.

--- End quote ---

You mean thermals? From what I understand they are used to make soldering easier. If that really helps then I would prefer to keep them. I don't have good temperature controlled soldering iron.

--- End quote ---

I'm talking about polygon connect style. You're using 'Relief connect' and yes, that helps with soldering, but you really don't need any good temperature controlled iron to solder even direct connect. I'm not using my reflow gun when soldering any types of components except for BGA or QFN ones, I'm using just a soldering iron. Usually you just put some flux on one contact of resistor/capacitor/other component, solder it, using twizzers to align component, and when you're happy with alignment - just remove iron from component while holding it with twizzers, let it cool down so it holds, and then just solder another contact pad of component. And I never had any issues using direct connect polygons and soldering components with just a simple cheap soldering iron. Yes, that would take a bit more time to heat up because of polygon plane, but nothing bad would happen. But again - that's up to you, I've seen many designs where relief connect is used, as an example - Atmel's evaluation boards, like ATSAM Xplained series and others.

Here's a link to connect styles in CircuitMaker:
https://documentation.circuitmaker.com/display/CMAK/PCB_Dlg-PolygonConnectStyleRule_Frame((Polygon+Connect+Style))_CM
Lt_Flash:
 Here's how a board with direct poly connects looks like. Also note the full GND plating on top, how C5 and L1 are connected together with a polygon and a couple of polygons for VCC and other voltages on the right.
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