Questions tagged [pcb-design]

About designing the boards which carry the components of an electronic circuit, including placement of parts and routing of traces. For questions about getting them built instead use PCB-fabrication. If your question is specific to a certain CAD tool, say which tool and version you are using.

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STM32 Programming Using Infrared

I'm trying to program STM32 using IR Emitter and PT. While trying this, there is interaction between the programmer and the PCB, but since the signals rise late, I get an error before I can send the ...
6 votes
3 answers
2k views

Should long PCB traces be treated as transmission lines?

Suppose I have a BNC in connector, terminated in parallel with a 50 ohm resistor. The PCB trace extends for about 5-7cm before the signal is 'read' by a power amplifier. Should I treat this PCB trace ...
0 votes
0 answers
42 views

PCB maximum trace current in a power amplifier

The datasheet for the TPA3123 lists the IC as a HTSSOP package. I am using this to drive two 20W 6 ohm speakers in a stereo configuration, with the IC powered from a 24V 3.2A power supply. With the ...
1 vote
1 answer
40 views

Altium - Back Annotating (PCB -> Schematic)

I have a project that was converted from PCAD to Altium. The PCB layout looks great in terms of component placement, tracks, polygons, etc. A colleague went through and created a bunch of schematic ...
19 votes
4 answers
6k views

Is my PCB design good or really bad?

I'm 14 years old and I am designing a PCB. I would like your advice on making it better or even restart it from scratch (as long as I learn something, I'm OK with it). It is going to be for an ESP32 ...
0 votes
1 answer
59 views

I can't find these ICs marked DK=H6G, AW=JFM

What are the ICs with the markings in the photos?
0 votes
1 answer
51 views

I can't find this IC marked 54b8

What are the IC with the marking "54b8" in the photo?
3 votes
1 answer
179 views

Raspberry Pi 4B POE Rectifier Circuit recommendation

Am I doing the signal rectification properly for the POE application using the Diodes on the RPI 4B 4 pin header? I have attached images of my design, as I am trying to use a Raspberry PI 4B with POE (...
0 votes
1 answer
26 views

XMOS XCORE 60-pin QFN footprint ground pad

I'm designing a PCB that uses an XMOS XCORE microcontroller (XU316-1024-QF60B-C24) and the only GND connection it presents is the middle ground pad. I couldn't find any example of how this is supposed ...
0 votes
1 answer
94 views

I can't find these ICs marked Z20hD, K00 JB, S2UI [closed]

What are the ICs with the markings in the photos?
0 votes
2 answers
88 views

PCB footprint design of the ADMP401

I am creating a PCB in KiCad and I am trying to create a footprint for my mic, the ADMP401. When creating the footprint and running the design rules checker, it says I have a clearance issue with the ...
0 votes
0 answers
37 views

STM32U5 not connecting to pc [closed]

I created this pcb and I am trying to make the pc to at least make a beep(or ding) when I connect the mcu to the pc, but it doesn't do anything (checked every pin on the mcu and it as a 0.5~ voltage ...
0 votes
2 answers
219 views

Programming an ATMega328 while on a custom PCB

I designed and had made a custom PCB for a project I am working on. The PCB uses an ATMega328 chip that sits in a socket that is soldered on the board. Currently, to program the chip, I am removing ...
1 vote
1 answer
2k views

BLE beacon 2.4GHz PCB antenna layout for SoC Nordic nRF52832

Schematic, suggested by the datasheet: PCB is round with 33mm, FR4 1.6mm Bottom side Top side Bottom+top 3d view The antenna drawings is based on AN043 of Texas, HERE. How about the question on ...
0 votes
1 answer
57 views

PCB layout for inductors

How should inductors be placed on a PCB? I have a relay (MCHMR1-S DC24V) switching about 3 A of current. Do I need to separate the relay from nearby analog and digital components, or is it fine next ...
0 votes
0 answers
62 views

How do they make PCB with 0.2mm tracks? [duplicate]

I want to understand how do they make PCBs with 0.2mm tracks. I have built PCB using screen printing process. As screen print requires 0.5mm minimum track thickness, I need to keep track wider. ...
1 vote
0 answers
58 views

Location of transformer

This is for a POE application. The inductor is in net with the capacitor, as the first attached image shows. I moved this inductor from the previous design bottom of board to its new location. Can ...
0 votes
2 answers
62 views

FT2232H PCB routing (high speed)

This is the first time I am making a high speed PCB so I am a bit unconfident. the ic I am talking about is this: FTDI232H I have followed the schematic in the datasheet above and I have placed the ...
1 vote
0 answers
127 views

ESP-32-WROOM-32EU PCB design

I have started a PCB design and I have tried to add an SHT45 sensor to my ESP32 chip board for my IoT project. Could you check my design for any issues? I am also open to recommendations. Is the ...
0 votes
2 answers
64 views

How to link GND vias to the GND plane

I know that it's possible for the GND vias to connect to the GND signal layer in a 4 layer stack. How do I achieve this?
0 votes
1 answer
30 views

How do I change minimum anular ring in vias for different layers in Altium?

I want to send my gerbers to a PCB manufacturer but its manufacturing capabilities force diferrent minimum anular ring for vias in different layers. For outer layers, its 0.13 mm and for internal ...
0 votes
3 answers
996 views

Polygon pour GND plane short-circuit error in Altium

I created a board outline, then wanted to add a polygon pour as a GND plane in the bottom layer of my 2-layer PCB. Altium's design rule checker raises the following error: Short-Circuit Constraint: ...
0 votes
0 answers
36 views

2D mapping of PDB Layout in Allegro

I am trying to export a 2D drawing of my pcb layout in allegro. I would like the layout to include the components and their reference designators. However, I cannot find a way to do so and the ...
0 votes
1 answer
53 views

Inverter Oscillator Ground Return

I have a PCB design for a guitar pedal with a DSP chip processing some audio signals that would normally run off a 32768 Hz crystal, but part of the guitar effect allows the user to change the clock ...
2 votes
1 answer
148 views

SDRAM logic makes noise on ADC readings with FPGA

I am working on a design in which an FGPA reads the output of a 12-bit 40MHz ADC and then stores half of the data on an external SDRAM and the other half on an on-chip BRAM after some averaging. The ...
1 vote
0 answers
37 views

PCB Layout review: ESP-07 with 28BYJ-48 Stepper board

I have used the 28BYJ-48 in conjunction with an ESP8266 in some applications and I thought it would be handy to have pcb made. I want to use JLCPCB including Pick and Place. The Kicad source code is ...
3 votes
2 answers
7k views

Altium trace length vs signal length

I've seen both of these in the PCB tab when editing the PCB board in Altium Designer.. what are the two? I thought I new, but I have fully routed traces with signal lengths of 0 as well as signal and ...
1 vote
1 answer
3k views

How to program the constant current of a LED driver for various current levels?

I need to design a backlight unit that will change its duty cycle and constant LED current via a microcontroller. My supply is a SMPS with 12 V, 20 A output. I need to drive 16 * 16 = 256 LEDs (16 ...
23 votes
9 answers
27k views

Ideas to stack multiple PCBs on top of each other?

My design has a number of boards stacked on top of each other. I would like to connect signals across the boards. The boards all need the same 10 signals running through them (all boards from top to ...
0 votes
0 answers
29 views

Signal Ground near Earth POE

I have Earth Ground 48V poured around the components before our diode array. I have three seperate ground planes, one for Earth, one for our POE components before the transformer, and our signal 5V ...
1 vote
0 answers
49 views

Coilcraft model pin 1

In the two images and linked model description, am I incorrect, or did they place the pin 1 indicator incorrectly? It should be bottom right, from the top view. Edit: seems their photo for the model ...
1 vote
1 answer
55 views

Transformer pins not matching PCB layout

I am replicating one of our recommended designs for a POE application. Here I have an EP13 forward transformer FCT1-50M22SL as recommended in the BOM. The pins do not match the provided image of the ...
1 vote
1 answer
42 views

Choke Placement for POE top or bottom?

a colleague designed the pcb and I wanted to remove the bottom components and place them on top so that we may attach a flex pcb to the back side. Attached is an image of the L3 choke, is there a ...
1 vote
1 answer
43 views

Transformer Pads not specified

FCT1-50M22SLD Pads 3 and 8 are not specified, or am I incorrect? How would you link the footprint to the symbol, since no models are available for this?
2 votes
3 answers
260 views

433MHz Antenna PCB Trace Design

I have designed a custom PCB which among other things has an RFM69HCW (ignore the text on the PCB, it is wrong) capable of outputting +20dBm. The antenna connection is done using a PCB trace (42[mils] ...
1 vote
1 answer
43 views

How to create in Kicad pads with different diameter on top and bottom

This is for a two layer design using Kicad 7. I need to create a footprint with 4 circular PTH pads that have larger diameter on the bottom layer than on the top layer. This is to satisfy mechanical ...
0 votes
2 answers
45 views

New to PCB design: Does routing a wire on a 2nd layer underneath a pad connection effect cause a connection issue?

I am designing a pcb with minimal room approximately 5.5mm wide, the power supply comes from one end of the board. The top layer has pad connections that take up most of the width of the board leaving ...
0 votes
0 answers
50 views

Transformer Schematic Explanation

Why does this design use two winding secondary outputs? I do not understand what is happening here. I know that the device converts for POE 5V 4.8W, but that secondary winding setup, how could I ...
0 votes
0 answers
28 views

Custom mount dev-board for A4988 stepper motor drivers - motor performance issues and loud noise

I have a project that requires 3 stepper motors driven by A4988 and NodeMCU V3 LoLin (ESP32). I 3D printed a panel to mount my components. Since I have 3 seperate A4988 drivers one for each motor I ...
0 votes
1 answer
37 views

Ground tracks or area for mezzanine connector

There is a mezzanine connector with many GND pins to be routed. I am wondering, which arrangement would be more beneficial? This is 6-layer PCB, red is top layer, next one is GND plane (hidden in ...
0 votes
1 answer
44 views

Are LSE and HSE a must when designing a PCB with an STM32F103C8T6?

I was designing PCBs with STM32 blue pill, but I need to design without blue pill, so I will need an STM32F103C8T6. Do I need both resonators? I read that one of them is for LSE and the other is HSE ...
0 votes
1 answer
38 views

Via sizing in Altium

I am making Vias on my PCB Design in Altium. I had query on how to relate the reference plane opening diameter and the via plating thickness on the Saturn PCB Calculator for my vias in the Altium ...
0 votes
0 answers
111 views

Is the higher voltage part of this PCB correctly designed?

I have designed a PCB that drives 3 relays from ESP32 3V3 signals (coming from another board). The "top" relay (SLA-12VDC-SL-C) is intended to drive a 230VAC/3A pump, and the other two are ...
11 votes
6 answers
7k views

PCB routing T joint alternative

Whenever I come across this situation: I feel a strong urge to make a T - joint like this: However 90 degrees are usually frowned upon. As such what's a better alternative to this T-joint? If I ...
0 votes
1 answer
90 views

How to simulate a finger touch electrically to remove noise

I am working on a project with "SIM800L" GSM module, the problem is that there is a noise from the module in the calls and it disappears when I touch the module's body with my hand. Kindly, ...
2 votes
1 answer
224 views

Creating a USB-C pass-through with power charging detection

I want to check if a tablet or laptop has a USB-C cable plugged in so I can have a visual confirmation that it is connected correctly. Most of the tablets I use do not have any visible feature that ...
0 votes
1 answer
81 views

TCA785 obsolete, replacement?

I am looking to redesign an old circuit diagram's phase control IC. I can't find any ICs that can act as a replacement for this item: TCA785. What should I look for in an IC for phase control? It is ...
0 votes
2 answers
681 views

Voltage/Current variation according to the time and EMI

It is largely said that large voltage or current variation according to the time produces EMI. (Electromagnetic interference). When drawing the layout, care have to be taken on traces with high : $$\...
0 votes
2 answers
69 views

Flyback converter sense resistor placement and wiring

I am designing my first ever Flyback converter. The Fsw = 100kHz. Peak primary current = 3.26A. The converter has to fit in a very small space, so I'm making a lot of compromises. For example, I could ...
0 votes
0 answers
49 views

How to solder a 5.5x2.1 DC plug to a PCB?

I am looking at mounting a DC plug on the side of my PCB board. Unfortunately, only jacks exists for purpose of PCB mounting, and there are no mountable plugs produced. (if they existed, they would ...

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