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About designing the boards which carry the components of an electronic circuit. For questions about getting them built instead use PCB-fabrication. If your question is specific to a certain CAD tool, say which tool and version you are using.

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I notice that you do not have any decoupling capacitors anywhere. Not around your regulators, not around your CPU. Also you do not have a reset circuit. You need one! Fix those first before doing a …
answered May 11 '18 by Oldfart
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Don't make the middle part too small. PCBs are produced in a 'frame' and removing the PCB from the frame has the danger that the debug portion breaks off easily in the last stage of manufacturing. I w …
answered Feb 15 '18 by Oldfart
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I normally leave them unconnected and program them as output. I would never connect them to ground or VCC if only to prevent a short circuit when the program is developed/changed. If you want to do …
answered May 31 '18 by Oldfart
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It is a capacitor use for power supply decoupling. A very 'standard' function where the value is no too critical. (With which I mean that in this case making it too big does not hurt). The value depe …
answered May 12 by Oldfart
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I Like Viewmate. I always use it as the last check before my Gerbers go to the factory. Often I still find some detail which I had no seen and fix the PCB. Load gerbers with File->Import->Gerber... T …
answered Aug 8 '18 by Oldfart
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I worked for a company that put ground layers at top and bottom and stitched them together all round the board perimeter, trying to make a Faraday cage. The product still radiated a lot. Turned out t …
answered Nov 27 '17 by Oldfart
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The real gull wing ICs had long (often golden) leads: In your case it looks like they gave the name to SMD pins you find on TSSOP, TQFP etc. packages. Looking at your footprint it looks rather lon …
answered Oct 26 '18 by Oldfart
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I am in a bit of a quandary here. I always tell everybody to follow the recommendations of the manufacturer. At the same time I know that the L298 has been used on many circuit boards, sold in the te …
answered Apr 14 '18 by Oldfart
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I've wondered, is it because the LCD only receives data from SPI Master and not sending back any data? That is very well possible. Is it possible to use SPI bus like that with route only 3 p …
answered Oct 6 '18 by Oldfart
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You have to 'patch' your PCB. I would do as I have tried to draw below: place two pull up resistors (10K) on the existing pads shorting them out. Then a wire from the other ends to the nearest 3V3 co …
answered Jan 26 by Oldfart
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There are literally hundreds of micro-controllers with a USB interface, all of which can do what you want. Most of them have example USB software. Some of them have built-in temperature sensors, but …
answered Nov 13 '18 by Oldfart
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Ok, this maybe weird but how about soldering some other SMD resistors (very high value) or capacitors(very low value) underneath? It greatly depends on which pads are active and which are passive.
answered May 2 by Oldfart
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I normally have one 100nF per supply pin, which is what you have too. The extra 10uF is good but you have rather lot if you add up them all up in the in various places. Fine if you can place them on t …
answered Jun 4 '18 by Oldfart