Hi im new to PCB-design. This is my first STM32 Board with USB, I2C, UART, SW and HSE.
Could i get some feedback.
Thanks in advance!
This forum is primarily aimed at helping KiCad users with KiCad specific questions, there are other more general electronics forums that are better suited to this kind of question.
Oh ok, sry about that.
Could you suggest some forums?
There are many . . .
I agree with RaptorUK here, but started typing before he posted…
- We occasionally do PCB reviews here, but in general the scope of this forum is for learning to work with KiCad. Not for electronics or PCB design details.
- There is not enough info in a screenshot for a decent PCB review.
But that said, overall it looks quite good. Full GND plane with minimal interruptions.
One small thing. There is no need to place via’s near THT GND pins. THT pads will connect directly to the zone (either with or without thermal reliefs) to any layer which has a zone with the same net. You can verify this by turning on the zone fill.
What is your track width for signal lines? In general, thinner is better, providing they are wide enough to be manufactured reliably. Even a 0.2mm track can handle 500mA, and that’s plenty for digital signals.
I always like to see some extra signal conditioning from external connectors. Maybe a PPTC, and also an inductor to filter out power supply noise (both incoming and out going).
AMS1117 is a pretty old voltage regulator. It has some stability issues, but it’s also very cheap, which makes it still attractive (and that’s why it’s also popular). There are also different variants, which may react slightly different. You should always check for oscillations on the power supply output of low drop regulators.
There are no results for electronics+forums
Edit (After Piotr): Now it does work, at first I thought it was the “+”, but maybe it’s got something to do with cookies or javascript libraries (I ordered my web browser to throw that all away when I close my browser).
Edit 2: Oops, AMS1117 is a “low dropout” according to the datasheet, but it does indeed have a drop out voltage > 1V, even at low current. LDL1117. (And 50mV @ 100mA). Piotr mentions has a typical dropout voltage of 350mV (@1.2A) and max 600mV. I see no mention of the minimum load current in the datasheet of LDL1117. This is also getting a bit off topic now…
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According to Google, you don’t deserve the information 
.
I got some, but most Polish addresses (but EEVBlog is also among them). Google selects, censors hits.
Added seconds later:
I have noticed that whenever I Quote the whole message then it is deleted from my post with marking that I have edited it. So then I insert it back and my post is marked as being edited twice.
It is a kind od software knowing better than you what you want.
I divide linear regulators into:
- standard (like 7805),
- LowDrop, and
- 1117 type.
Standard have voltage drop in a range 1.5-2V, LowDrop in a range 0-0.4V, and 1117 is between them - around 1V. I think (not sure that now) that 1117 has less stable problems than LowDrop.
I was looking at 1117 since years but didn’t liked its minimum load current (for LD1117 it can be 5mA).
But since few years I use ST: LDL1117S33R. I believe it can be used even without load, but to tell you the truth I didn’t checked it.
Hi, ill use EEVBLOG from now on 
Thanks for the tips. Im using 0.3 mm for signals.
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If you have any KiCad specific queries/issues/need for tips . . . please come back and ask, we are always happy to help support KiCad users with KiCad queries
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