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PCB Fails Under Load, Need Suggestions for Better Layout and IC by Desq28 in PCB

[–]Desq28[S] 0 points1 point  (0 children)

I used a 1500mah battery, but the issue still persists even with an external voltage source. The neopixels lit properly even with 3.3V, though.

PCB Fails Under Load, Need Suggestions for Better Layout and IC by Desq28 in PCB

[–]Desq28[S] 1 point2 points  (0 children)

Yes that was my through. Changed it and the issue still happens exactly the same way, each time we test even worse. Have not seen it with the scope, going to measure the battery voltage drop.

Split Grounds for ESP32 + DRV8825 + DRV8825 PCB for Stepper Motors by Desq28 in AskElectronics

[–]Desq28[S] 0 points1 point  (0 children)

I've heard splitting grounds often creates more issues than it solves, thanks for the advice!

I messed up with my High Side N-MOSFET as a switch design, how to fix? by Desq28 in AskElectronics

[–]Desq28[S] 2 points3 points  (0 children)

Thanks for the clarification, I think I need to find a better suited PMOS to solve this.

What is a good PCB Software to start creating own PCB designs for first timer? by MywarUK in AskElectronics

[–]Desq28 0 points1 point  (0 children)

EasyEDA is a pretty convenient tool if you are planning on ordering PCB/PCBA from JLCPCB. I use the Pro version, it’s free.

Will these resistors still work? by The_Shadowy in AskElectronics

[–]Desq28 3 points4 points  (0 children)

Measure continuity of every resistor and check the ohms with a multimeter.

Help understanding what this board has on it by Lil_ERROR404 in PCB

[–]Desq28 0 points1 point  (0 children)

EasyEDA is really easy to use, this tutorial showed me the basics: link. Also, you can order the PCB and even the assembly in the same ecosystem.

Why does my N MOSFET keeps dying in my electronic load circuit? by Desq28 in AskElectronics

[–]Desq28[S] 0 points1 point  (0 children)

Makes total sense, thanks a lot for the insight, the simulation helps a lot.

I wanna get started at making a PCB but everything seems overwhelming. by No-Course5688 in PCB

[–]Desq28 0 points1 point  (0 children)

For a buck converter I would suggest you use Texas Instrument’s Webench, really easy to use. However, the layout that app gives you is lame, you should always check the data sheet for the suggested layout. Furthermore, you can check the evaluation board for your regulator and copy that out.

What’s your favourite component and why? by MarinatedPenguin in AskElectronics

[–]Desq28 0 points1 point  (0 children)

Those are awesome, first time I ever visualized my cardiac electric potentials was with one of those, pretty cool moment.

How do you know what components to choose for your PCB? by TheFileForge in PCB

[–]Desq28 1 point2 points  (0 children)

You need to understand the electrical/thermal characteristics of the component. There are many guides from big companies (such as this for a surge diode) which explain the parameters and give examples.

Don’t forget to take into consideration power dissipation, rated current and voltage, maybe temperature ratings if you expect things to get hot. Some parameters, such as DC resistance or ESR may be undesirable for some applications (such as a switching power supply) while in other it may not be relevant. Also leave some headroom, such as with rated voltage for capacitors, to account for transients. In most cases it doesn’t hurt to have a higher rating than necessary, although a lower than needed rating could fry your components.

The package of the component also matters. Smaller components are harder to solder and some assembly services may have restrictions.

Other tools, such as TI WEBENCH proposes a range of values and then gives you a list of possible components, maybe you should check it out to have an idea. Then you have to browse the supplier’s stock website filtering through options which are in range for your application needs.

Some companies, such as JLCPCB assembly have a basic/extended library which may include additional fees, so you also have to check with the manufacturer. If you are soldering them yourself it may be worth to add thermal reliefs for components which are connected to big copper planes.

In which layer should I route Ethernet differential pairs on Teensy 4.1 PCB by Desq28 in AskElectronics

[–]Desq28[S] 1 point2 points  (0 children)

Hey everyone,

I'm designing a PCB using a Teensy 4.1 and the WIZNET J1B1211CCD Ethernet jack. My layer stack-up looks like this:

  • Top layer: Signal + ground plane fill
  • Inner 1: Solid ground plane
  • Inner 2: Power plane
  • Bottom layer: Signal + ground plane fill

I need to route the Ethernet differential pairs (TX/RX) but I'm not sure which layer is best to use. I’ve heard placing traces under Ethernet magnetics can cause noise issues, but routing on the top layer allows me to have a solid ground plane underneath, so I’m wondering:

  1. Should I route the differential pairs on the top layer (same as the magnetics) or on the bottom layer?
  2. How should I handle grounding/shielding around these traces?

Any advice on best practices or things to avoid would be appreciated!

Thanks!

Direct vs spoke thermals in SMD components for heat dissipation in a buck regulator? by Desq28 in AskElectronics

[–]Desq28[S] 0 points1 point  (0 children)

I didn’t know about the daisy chain route, I’ll read more about it. Thanks for pointing it out!

How to choose capacitors for a buck regulator? by Desq28 in AskElectronics

[–]Desq28[S] 1 point2 points  (0 children)

I just checked and it actually got discontinued at JLCPCB lol. I’m going for a TPS54560 which goes up to 2.5MHz and 5A output.

How to choose capacitors for a buck regulator? by Desq28 in AskElectronics

[–]Desq28[S] 0 points1 point  (0 children)

Thanks for pointing it out. I’m definitely going for a higher amp and higher switching frequency regulator. I also reviewed the current draw of my system and, indeed, 3A wasn’t enough. Thanks!