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Vladislav Kudenko , 10-23-2025, 02:00 AM

Hello everyone! My name is Vladislav, nice to meet you all! I am a beginner in the PCB design and hardware design overall. I have built my first project and would like someone who has more experience than me, have a look at it. If it's at least worth of calling it a project or it is not going to work at all. Thank you in advance for any kind of advice! 🙂

Robert Feranec , 10-23-2025, 02:43 AM

I would add some info about voltage and power ratings (input / output). Why did you place ferrite beads into outputs?

Vladislav Kudenko , 10-23-2025, 03:05 AM

Yes, I understand. This information is important, cause the current is limited, so the power is. I placed FB cause I know that the pi network can deal with the high frequency noise well. Maybe, 3V3 is a linear regulator, so it’s not that necessary, but the 5V is a switching power supply. I thought it’s a good practice to put them there.

Robert Feranec , 10-23-2025, 11:07 AM

Let's wait what other people say. Normally I would not place FB there .... you also have the resistor in series, if you really wanted/needed you could just replace that resistor

QDrives , 10-23-2025, 06:31 PM

With enough input capacitance, you can place an inductor or ferrite bead on the input. However, placing it on the output does more damage then good in most cases.

Robert Feranec , 10-23-2025, 11:39 PM

@Vladislav Kudenko also, I don't know what is your input voltage, but if it can be a range, than i would probably connect the 3v3 linear LDO on 5V rail to be sure it will not get too hot for higher voltages. But in that case you would probably need a stronger 5V regulator. BTW, the 5V regulator has PG output, I would use that output for the power led indicator. Small detail - todays LEDs are extremelly bright, you may need to tweak the led series resistors values to make them higher. Also, dont forget, the diodes on inputs are easy solution and they are ok for small currents, for higher currents you may have a lot of loss on them (means lower efficency of your circuit and the diodes can get hot - especially the diodes in small package, you can easily calculate approximate power loss on them, just multiply max current with voltage on the diode ... the diodes you used look tiny, did you consider the heat on them?).

I did not check details of your circuit e.g. I did not check 5V regulator connections and components around it, this my feedback is just a generic feedback about concept.

I always recommend - for these simple projects, just build the board and play with it.

Robert Feranec , 10-23-2025, 11:48 PM

Also, the 5V regulator datasheet, does it have a section about recommended component placement and PCB layout? Just be sure you follow it.

Robert Feranec , 10-23-2025, 11:57 PM

I circled top 3, but there are more things what need improvments

Robert Feranec , 10-23-2025, 11:57 PM

Robert Feranec , 10-23-2025, 11:58 PM

I found the datasheet, see how they did that:

Robert Feranec , 10-23-2025, 11:58 PM

Robert Feranec , 10-24-2025, 12:00 AM

Purple: How the current will flow between the GND of capacitors and GND of regulator? What will be the path? I cant see vias there

Robert Feranec , 10-24-2025, 12:00 AM

Green: notice how wide tracks they used and how close they placed the capacitors in the reference layout

Vladislav Kudenko , 10-24-2025, 12:58 AM

Thank you everyone for the feedback. Will do my research on the components you suggested to change or remove. And I will redo the layout of the 5V regulator.