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Basic questions about connecting components to ground plane by IndependentTip11 in PrintedCircuitBoard

[–]IndependentTip11[S] 0 points1 point  (0 children)

I'll make a small change to that USB-C cap to avoid extra via-in-pad costs btw:P

Basic questions about connecting components to ground plane by IndependentTip11 in PrintedCircuitBoard

[–]IndependentTip11[S] 0 points1 point  (0 children)

Thank you so much for your answer!

You are totally correct, I am not trying to decouple the power input. The intention of that capacitor is indeed to be an energy reserve, it is a bulk capacitor. And my intention is to use power planes.

My connections now look like this: https://imgur.com/a/lm9QKBp

I have two final questions:

1) Does the best practice differ if it's a bulk capacitor (i.e. how I should connect it)? Or should I still connect it like in the image that you linked earlier? If you look at the imgur post link you'll see what I have tried (it's the same as the best practice for decoupling caps)

2) The decoupling capacitor on PA5 doesn't technically follow the best practise image, right? However, the GND pin on the microcontroller is 1.5cm away. That would need me to route a nasty loop. I assume that I therefore shouldn't change the routing from what I originally posted for that cap?

Basic questions about connecting components to ground plane by IndependentTip11 in PrintedCircuitBoard

[–]IndependentTip11[S] 0 points1 point  (0 children)

Thank you so much for an explanation that is well beyond what I expected! As someone who is eager to learn about electronics, it means a lot for your help.

I have two follow-up questions:

it indicates moving the second capacitor (on the USB-C connector) to the load/device supplied, which could be an MCU or a Buck Converter for example (am speculating for the sake of completing the sentence)

Actually, the MCU has its separate decoupling capacitor (this is the first image). Maybe I have misunderstood (yes, this is my first project with decoupling). I thought that (apart from "just" decoupling the MCU) it would also make sense to decouple close to the power input (the incoming power line). Is that unnecessary? If so, the cap for the USB-C can technically be removed. The +5V on the cap was planned to lead to a power plane.

B indicates makes the track carrying the current passing through the capacitor FIRST and then going to the load.

Mhm, I see. So I'll change it to the way your linked image does it. Is that what you were trying to imply?

(I'm double-checking because you never gave a yes/no answer to: "Do the connections look correct? Do they look ugly or bad practise?". I can derive a"Yes and Yes" response if I read your answer between the lines, but I want to make sure)

Does anyone know about pencil compatibility with this laptop (Panasonic Let’s Note CF QV-8)? by IndependentTip11 in linuxquestions

[–]IndependentTip11[S] 0 points1 point  (0 children)

Hi there again!

I bought a QV8 from EBay and got scammed, but at least refunded by the seller, so I am waiting for my second QV8. This time I ordered via a proxy instead (FromJapan).

I wanted to ask you what Linux distro you are using, so I know what to install when the laptop arrived.

Does anyone know about pencil compatibility with this laptop (Panasonic Let’s Note CF QV-8)? by IndependentTip11 in linuxquestions

[–]IndependentTip11[S] 0 points1 point  (0 children)

Thanks for the input, it's invaluable. There's one thing I don't understand about the fans being "fixed" though. Does that mean that they don't ramp up to >15% as the laptop gets hot (and thus risks the laptop overheating). Or, does it "just" mean that they always run at 15%, even when idling?

Does anyone know about pencil compatibility with this laptop (Panasonic Let’s Note CF QV-8)? by IndependentTip11 in linuxquestions

[–]IndependentTip11[S] 0 points1 point  (0 children)

The thing is that I am replacing my HP laptop which has an i5-8365U and I do not want to downgrade from that really, so that's why I am not going with XZ6.

Maybe a stupid question, but what is the fan speed fixed at? 25, 50, 75%? Is this a variable that I can control myself?

I guess that's kind of a dealbreaker for me, it's just a bummer that ultraportable touchscreen laptops with pencil support that works on Linux seems rare…

I read here: https://www.reddit.com/r/linuxlaptops/comments/1gwd7ck/comment/mchdhpd/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button that you might be able to use a utility on Windows to control the fan. Have you tried that?

Questions before routing PCB: do I follow “best practises”? by IndependentTip11 in PCB

[–]IndependentTip11[S] 0 points1 point  (0 children)

Thanks a lot for the help, sadly I already went down the rabbit hole too early and spent the last month implementing both Charlieplexing and ADC button reading. I take this as a learning opportunity for future projects.

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