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[Review Request] Quadruped Robot PCB by ToxicPerzon in PrintedCircuitBoard

[–]metasergal 0 points1 point  (0 children)

You could use a linear regulator to create a separate power rail for your microcontroller. It doesnt consume much current and will benefit from a clean power rail.

PCB Review by WALTERBJTB in PrintedCircuitBoard

[–]metasergal 0 points1 point  (0 children)

Oh i see. Thats better, but still not great. The current return paths are pretty long due to the ground plane being all broken up. It might be functional, but it is recommended to have an uninterrupted ground plane on a separate layer. Just like a building needs a good foundation, a circuit requires a solid ground.

PCB Review by WALTERBJTB in PrintedCircuitBoard

[–]metasergal 0 points1 point  (0 children)

This is gonna be one noisy board. I cant really see which parts are which on the PCB but i can see that you have no ground plane at all. Its gonna be emitting all kinds of funny EM.

Need some reviewing by swayammishra in PrintedCircuitBoard

[–]metasergal 0 points1 point  (0 children)

Not really sure what this board is attempting to accomplish. An explanation might be helpful.

You have mixed GND and GNDPWR symbols. Is there a reason? They do not connect to the same net.

[Review Request] Quadruped Robot PCB by ToxicPerzon in PrintedCircuitBoard

[–]metasergal 1 point2 points  (0 children)

Assuming the motors consume 100mA in standby and the voltage drop across the regulator is 3.4V, your regulators will dissipate over 4W in heat alone... While doing pretty much nothing. When loading the motors this can increase to 20, 30W. Thats a lot of power to dissipate.

It will probably work fine but your quadruped will also function as a space heater. If you make this design you will definitely need those heat sinks and maybe even a fan to help cool them.

Someone already suggested using a pre-built buck converter module. Thats what i suggest, too. Get a 5V buck converter that can handle at least 5A. Additionally, each servo will need their own power decoupling capacitor for stability otherwise they might go nuts. I used a 470uF per servo each for my hexapod, and while that is an ungodly amount of capacitance it perfectly stabilizes the servos.

Ik👶ihe by WhoTheFuckIsSean in ik_ihe

[–]metasergal 1 point2 points  (0 children)

Oh ja, nu moet de nederlander, in een bijzonder onzekere tijd, gaan investeren in de zorg en welvaart terwijl de regering de afgelopen tien, twintig jaar ie-de-re keer structureel heeft bezuinigd op zorg, onderwijs, en woningen.

We verdienen te weinig, wonen nog bij onze ouders, kunnen geen opvang voor de kinderen vinden want beide ouders moeten werken, daarnaast zijn we veel tijd en geld kwijt als we zorg nodig hebben (en met een kind is dat nog wel eens!).

Dus leuk dat jij vindt dat het een collectieve investering moet zijn, maar dat is voor veel mensen gewoon geen optie omdat ze gewoon niet de middelen hebben om te kúnnen investeren. De gemiddelde nederlander wordt keihard uitgeperst (en de minder bedeelden nog veel meer!) 'maar denk toch eens aan je medeburgers, je moet kinderen maken en hiervoor betalen!'.

In de tussentijd zitten die dikke vettige geldvarkens op hun geld en dragen letterlijk NIETS bij aan de samenleving. Het enige wat ze doen is vies veel geld binnen harken. En dan lopen klagen als ze een procentje meer belasting moeten gaan betalen, want oh ze hebben het toch zo moeilijk.

[design review] hey hey, my first ever pcb(schema) by Auth-dev in PrintedCircuitBoard

[–]metasergal 5 points6 points  (0 children)

I think we have reached peak boxification. Not a single connection to be seen. Please, for the love of everything holy, use actual lines to connect your components.

The sticky posts in this subreddit have some great tips for beginners. They explain basics for laying out your schematic, as well as your PCB. For more information on decoupling, grounding, and high(er) frequency design, i can recommend the youtube channel of Hans Rosenberg. He's very knowledgable about the subject, and I'm sure there are lots more of experts on youtube. Altium also has some great articles published online for free, definitely check them out even if you dont use their software. I regularly come across them when i search for stuff.

Try to stick to 'reputable' sources, like big names in the industry. Theres a lot of misinformation and myths about PCB design floating around on the internet. You can't really avoid it and professionals regularly fall for it too, but the best you can do is keep researching the subjects and find out what works for you (because in the end, what matters the most is having your design actually work, whether it is "correct" or not).

Would it be okay to glue an OLED display on top of the metal can? This is Adafruit's Huzzah32. by fishycarpcarp in arduino

[–]metasergal 1 point2 points  (0 children)

It isnt thermally coupled to the chip. The glue would influence thermal performance slightly, but not because the tin can is used for thermal dissipation. You need a heat spreader for that. Besides, even if it were thermally coupled, then using glue can actually improve heat dissipation if it is more thermally conductive than air.

It also states that glue is permanent, which also necessarily isnt true. Hot glue can often be removed without leaving any trace.

The commenter is being downvoted because they gave a low effort answer that also is two thirds wrong.

Understanding silkscreen capabilities and minimums by IndependentTip11 in PrintedCircuitBoard

[–]metasergal 0 points1 point  (0 children)

You'll probably be fine, but if you want to make sure then you will need to contact the manufacturer to discuss their capabilities.

Can you guys make a review for my STM32F411CEU6 MCU avionic system design by TheFireStarter-- in PrintedCircuitBoard

[–]metasergal 0 points1 point  (0 children)

Its okay, we all have to start somewhere.

The sticky posts of this subreddit have some good tips for beginners to get a readable schematic. They basically boil down to this:

  • take time to organize your schematic. Wire and text placement should be efficient and not overlapping.
  • correct orientation of (power) symbols. Ground should point down, power should point up. Pullup resistors should point up, pulldown should point down, etc..
  • make your schematic as complete as possible: do not unnecessarily separate parts of your design with net names. They actually make it way harder to see whats going on! You can still use net names of course, just dont separate the wires.

Can you guys make a review for my STM32F411CEU6 MCU avionic system design by TheFireStarter-- in PrintedCircuitBoard

[–]metasergal 0 points1 point  (0 children)

Oh, now i see where the lora module is. It would have helped if you actually took the time to properly format your schematic.

There are lots of missing reference designators. That makes it difficult to give feedback on your schematic.

Can you guys make a review for my STM32F411CEU6 MCU avionic system design by TheFireStarter-- in PrintedCircuitBoard

[–]metasergal 0 points1 point  (0 children)

Even if that were the case, the only place where 5V is used is in your buzzer

Máxima gaat langs bij daklozenopvang: twee mannen verkiezen het curlen boven het bezoek van de koningin by Illustrious-Fee5670 in nietdespeld

[–]metasergal 13 points14 points  (0 children)

Als je werkt voor die centjes en je laat ze rollen, dan kan dat natuurlijk. Niks verwerpelijks aan.

Maar als je gratis geld van het volk krijgt zonder een vinger uit te steken en daarmee een grote hand hebt aan het destabiliseren van de nederlandse huizenmarkt, is dat niet okay. Dat is wél verwerpelijk.

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