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 ...
harmonica's user avatar
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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 ...
lemon's user avatar
  • 223
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 ...
RogerDodger's user avatar
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?
Kareem Elzeftawy's user avatar
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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?
Kareem Elzeftawy's user avatar
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 ...
lemon's user avatar
  • 223
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 ...
Emerson's user avatar
  • 413
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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 ...
user23342283's user avatar
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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?
Mohamed Ehab's user avatar
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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 ...
Wolffyx's user avatar
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 ...
lemon's user avatar
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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. ...
Pravin's user avatar
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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?
9_daytona's user avatar
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 ...
Developing Electronics's user avatar
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 ...
Loic Daigle's user avatar
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 ...
Mehmet's user avatar
  • 11
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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 ...
Roy's user avatar
  • 25
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 ...
longlivetheDee's user avatar
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 ...
Besi's user avatar
  • 727
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 (...
Wes Ellgass's user avatar
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 ...
Wes Ellgass's user avatar
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 ...
Wes Ellgass's user avatar
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 ...
Wes Ellgass's user avatar
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 ...
Wes Ellgass's user avatar
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 ...
Wes Ellgass's user avatar
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 ...
cr1tical1's user avatar
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?
Wes Ellgass's user avatar
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 ...
J_KILEY76's user avatar
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 ...
Wes Ellgass's user avatar
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 ...
Sterling Duchess's user avatar
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 ...
smajli's user avatar
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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 ...
zapta's user avatar
  • 11
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 ...
Akinci's user avatar
  • 1
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 ...
Andr7's user avatar
  • 161
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 ...
Silverspur's user avatar
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, ...
Mohamed Essam's user avatar
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 ...
Wes Ellgass's user avatar
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 ...
underflow's user avatar
0 votes
2 answers
75 views

Via sizing and parallel vias

How to estimate the via pad diameter? I am using pi*d = trace width I have decided but Saturn PCB Design calculator is giving very lower current value at that diameter. How to decide the via hole ...
Andr7's user avatar
  • 161
0 votes
1 answer
25 views

USB-C assistance

I am creating a phased-array controller of sorts and will be using USB-C to power the controller. I have not used USB-C on my own PCBs. I would like a bit of clarification. I used the generic USB-C ...
Alexandria Walker's user avatar
1 vote
0 answers
73 views

ESP32 programming & EN delay circuits

Can you help me verify this schematic which: creates the EN pin delay circuit using recommended R&C values from Espressif adds ESD diode, as recommended by ...
underflow's user avatar
4 votes
1 answer
58 views

DDR2 CLK vs DSQ vs ADR length matching

I am tracing my first DDR2 with Cyclone V PCB and I can't find exact information about CLK vs DSQ vs ADR length matching. External Memory Interface Handbook Volume 2: Design Guidelines from Intel says ...
kornev.online's user avatar
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 ...
slimcolt's user avatar
  • 123
0 votes
0 answers
30 views

Clearances issues during routing

I am designing a 4-layer PCB in Altium, and I have defined my clearance rules for my high-voltage board (100 V) in the rules section, but the Altium software has a default clearance rule of minimum 0....
Andr7's user avatar
  • 161
0 votes
1 answer
110 views

Voltages from thermistors drop at the input of op-amps in follower configuration

I designed a PCB to monitor temperature, pressure, voltage, and current. To monitor the temperature I am using thermistors conditioned with a voltage divider. The output of the divider goes to the ...
Zack343's user avatar
0 votes
0 answers
92 views

PCB layout/schematics of solenoid lock control - Problem - uncontrollable unlocking

I have a problem with opening solenoid locks. Sometimes, immediately upon connecting the power, and other times after about half an hour or even an hour, the locks start to open uncontrollably. I have ...
douce's user avatar
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0 votes
1 answer
99 views

Is my PCB ready for PWM solenoid control?

I am looking to upgrade my project to handle "back EMF" from solenoids when used in PWM mode in combination with MOSFET. The original project lives on a breadboard, and I am attempting to ...
underflow's user avatar
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 ...
Farzin's user avatar
  • 31
0 votes
1 answer
44 views

Large current flow through SMD shunt resistor

What is the best way to large current flow through SMD resistor? As you know, latest FPGA like ULTRA series or Versal series need large Core current almost over the hundred ampere. It is not problem, ...
mark-r6's user avatar
  • 15
0 votes
1 answer
63 views

ATmega328p-A Schematic

I just finished designing my attempt at an ATmega328P-A board, had some trouble understanding how to program the MCU. The manual of the MCU didn't specify really well how, or I just didn't find the ...
dimpanas's user avatar

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