Questions tagged [pcb-design]

About designing the boards which carry the components of an electronic circuit. 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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51 views

PCB Single Local Fiducial

I have a question regarding local fiducials so as to achieve proper alignment of the board, during the soldering of a 0.4mm pitch chip. As I have seen the best practice for local fiducials is to place ...
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22 views

Ctrl+Right Arrow shifting component left in altium layout

After doing flip and rotation of entire board, I see Ctrl+Right Arrow shifting component left, this is not normal as per specified Altium Short key. Please help me to solve this issue ?
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2answers
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Altium - Linking Sheet Entries/Ports with Net Labels

I am struggling to find a way to get the compiler in Altium to see a Sheet Entry/Port (tried with both) and a net label on the same sheet to link. This redacted schematic page shows what I have (this ...
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19 views

eagle library model for STM32F730R8T6

I'm designing small DSP device, currently I've been using stm32 development board but now I need to move to dedicated PCB. I can make footprint for uC myself, but I believe it should be available ...
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2answers
95 views

What type of conformal coating must I use and where must it be applied over the PCB?

I have designed the layout of a PCB that will have an unique area with crimpage terminal connectors receiving 6KV by an external wire. I have done the shortest polygon (instead traces) for 9 PCB ...
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115 views

PCB Layout - Ground Plane Clearance Around and Under Ceramic Resonator

We are using Murata's 4MHz Ceramic Resonator (CSTCR4M00G53-R0) in one of our designs and request help in PCB layout design around Ceramic Resonator. The below Murata's FAQs page suggests not to place ...
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34 views

Proteus PCB layout components problem

I am designing the PCB layout but some number of components forming the group. I can't able to use this component. I am not able to pick a single component. I have attached the problem image below. ...
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1answer
59 views

Motors overheating with DRV8835

We have a problem with the DC motor driver DRV8835 that we have soldered to the black PCB attached below (4). Prior to this driver, we were using L293D h-bridges to run these DC motors and never ...
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1answer
193 views

( How-To ) Ultra Low-Profile PCB Stacking [duplicate]

Recently I found myself needing to stack two small circuit boards on top of each other for a modulation project. The problem is that the areas I want to connect together on the two boards have no ...
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1answer
155 views

5V Switching Regulator Problems

I have a circuit with two supplies. A 19v supply for stepper motors, and a 5v supply for driving the ATMEGA644, 3 stepper motor driver daughter boards, a bluetooth LE daughter board, and 2 ws2812b rgb ...
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34 views

How to make polygons smoother

I am designing a board using Altium Design 18.1 and I have just poured this GND polygon and it looks so roughly is there any way to make it smoother?
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1answer
54 views

How to connect power to multiple pins on a microcontroller?

I'm creating board with basic MCU STM32F334K8T6. STM32 have three VCC pins. Each of them needs to be fed. Two options: Connect them to each other. Connect all power lines at one point. To use the ...
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1answer
164 views

ISA Card Mechanical Drawing Source

I'm designing a new ISA form factor PC board for a legacy system. I've looked around the net and found several references for ISA board dimensions, but they don't call out the location of the edge ...
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1answer
594 views

Altium: board cutouts and multiple flex-regions

I am currently trying to create a rigid-flex PCB in Altium according to the following picture: Purple: this should be the mechanical bard shape ; Red: flex regions basically i want to have a ...
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9answers
15k 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 ...
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2answers
139 views

Advice on choosing PCB for a 16A, 85V switch circuit

I am making a circuit that will allow a load to be configured in this manner: Load is ON/OFF. If OFF (controlled by a low-side FET making the circuit OPEN), the high side and low side can be ...
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2answers
54 views

KiCAD: Triaxial Connector Footprint from Drawing

I am planning to use a PCB-mount triaxial connector, CBBJR79TL, in a design for a laboratory prototype. Making reference to the "recommended mtg hole pattern" section from the CBBJR79TL drawing, I ...
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51 views

DC Motor doesn't change from lock to unlock

Can someone tell me why the motor doesn't change from lock to unlock? I designed a PCB circuit wich controlls the Motor movements and Lock. The motor has a magnetic lock. When switch to Unlock mode , ...
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1answer
29 views

Cant open EAGLE Schematic file in Altium10

Iam using Altium designer version 10 and I cant open a EAGLE schematic file in this. EAGLE importer is not in the import wizard. can any one help me?
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2answers
60 views

Which footprint to use for LM324 SO-14 in KiCad?

I want to use the LM324 quad-amp in my PCB design. KiCad already provides the symbol in the Amplifier_Operational package. However I don't know which footprint to assign. I tried assigning the ...
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1answer
130 views

Heatsink pad connected to ground pins

Is it safe to use the exposed heatsink pad of a QFN to also connect the ground pins of the IC? (Like this question, but in my case the pad has many vias connecting it to ground plane.) Additionally, ...
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0answers
40 views

Custom pcb with 32U4, USB not working

I am wondering why USB isn't recognised at all. I followed Sparkfun Pro Micro specs. Firmware upload works fine (Adrduino Leonardo) Any help welcome !..
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0answers
20 views

USB On-The-Go setup for PIC32MK and bootloader

I am looking to utilize the USB OTG module of the PIC32MK0512MCF064 and would like to make sure I understand USB as I have not used it and I didn't find a post with my scenario yet. The goal is ...
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1answer
59 views

How do I tell if a voltage regulator is enough to supply a larger board?

So I'm currently designing a PCB that's fairly large by my standards (10"x5"). It's a 4-layer board with internal GND and 5V layers. I'm currently using a linear regulator (LM340SX) to provide the 5 ...
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1answer
77 views

How to find popular and conventional electronic parts? [closed]

We have linear regulator: AMS1117 that I think it must be popular, since many company manufacturing this. Also some have changed it's name slightly to emphasis on their company like LM1117 and LT1117. ...
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1answer
304 views

Through Hole (Vertically Mounted) SMA Connector on PCB - Feasible for GNSS Application?

Due to space constraints on a board I am designing, it is ideal to have the GNSS cable connecting vertically onto the top of the board. I haven't been able to find any edge-mounted connectors that go ...
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3answers
297 views

How to minimize impedance from capacitor to Gnd and Power planes

I'm trying to minimize the impedance from my capacitors to the Gnd and Power planes. 1. Via positioning I've learned from several sources that the best via positioning is close to each other. This ...
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3answers
228 views

Warming PCB in cold environment using SMD components only

I made a sensor board that needs to operate at about -55 degrees Celcius. Unfortunately, its key component often malfunctions when the circuit is cooled for days at the temperature and then powered up....
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2answers
57 views

How to connect a few shields correctly?

There are several shields on my PCB: shield on CAN-bus, on RS485, on Ethernet, on ENCODER motor signals. How do I correctly connect all these shields? If I use the star topology, which filters should ...
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0answers
24 views

TP4056 and ST32F103C8T6 shorting after few uses

Complete schematic: Top part: Lower part: This is the circuit schematic, top part is sensor, bluetooth, microcontroller, oled and pins related all working from 3.3v coming from regulation of a ...
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3answers
144 views

High Speed Signals PCB guidelines [closed]

How quick does a signal have to be in order to be considered a high-speed signal? What are the limits and threshold where you can get away without special PCB layout?
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3answers
266 views

Which is the preferred approach to PCB layout for signal vs power traces in analog circuits, and things to consider?

I have had to layout 2 layer PCBs several times now for analog signals, and am just beginning to learn the process. I often face a similar question in one form or another with regard to laying out ...
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1answer
142 views

PCB Design Specification Document

My company has been designing PC boards since the early '80s. However, we haven't formalized our PCB Design procedures or preferences. Things like preferred PCB sizes, preferred location of mounting ...
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1answer
62 views

RC Filter Layout on PCB

Is there any difference in effectivity between the following two layout examples of an RC Filter? The first has the signal passing directly through the capacitor, while the second has the capacitor ...
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2answers
90 views

Why would this power mosfet be made in a surface mount package?

I’m looking at the CSD17303Q5 power mosfet which boasts a 100A max drain current. It confuses me why they have it in a VSON surface mount package because most pcbs would not be able to handle that ...
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1answer
88 views

Trying to get 2 Amps out of 3 Amp Regulator (MIC29302WU)

I am trying to get 5V,2A out of the MIC29302WU (TO-263 package) with an input voltage of 12V. The voltage drops to around 2.2V when trying to supply even 1.3A. Blowing canned air over the regulator ...
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1answer
66 views

Altium: Rectangular clearance around rectangular pads

I am designing a high voltage PCB so I have created clearance rules between nets equal to the pad spacing on the high voltage capacitors (4.5 mm). When I pour polygons, Altium appears to produce ...
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2answers
63 views

How to determine vias and through holes from 4-layer Gerber files

I'm trying to understand the difference between the vias and plated through-holes in these reference Gerber files. On layer 3, I don't understand why there are so many holes (vias)?. Why are some ...
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0answers
35 views

Antenova M20057 active antenna is not working

I have decided to use Antenova product which is M20057 (datasheet) as an active GPS antenna. I am using Quectel L96 GNSS module. There is an internal chip antenna on L96 module and I have tried the ...
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0answers
16 views

xpedition designer

I am here to clarify regarding on schematic creation using mentor xpedition designer,I finished my schematic drawing using xpedition dx designer so now i want to take my work another level(layout) for ...
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1answer
36 views

PcbNew invisible field still showing

I was editing a PCB and KiCAD crashed. When I restarted all fields that were previously invisible are now showing, even though their property is set to invisible. Is this a bug? Or an option I can ...
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0answers
41 views

Voltage spikes caused by stray wire

I recently had a PCB designed which has several analog, digital, and power elements. The board is powered by 24Vdc which is stepped down using an LDO to 3.3V and 5V. These voltages are used to power ...
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1answer
43 views

Altium: Vias not showing annular ring

I have vias connected to the polygon. In the old design (left pic) the vias have annular rings. But I modified few other things in the PCB. I removed unused vias in both new and old design. But now in ...
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3answers
583 views

How to calculate the size of ground plane we need to use in a PCB (printed circuit board) design [closed]

I searched about the ground plane and found out the ground plane is a good solution to reduce noise and get a seamless ground. How do I calculate the size of the ground plane for a PCB? When and ...
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2answers
63 views

PCB: ground plane thermals (in Eagle)

In a previous iteration of a PCB layout, I added a ground plane fill as recommended by many tutorials online (eg Sparkfun). By default Eagle creates thermals to ease soldering to the ground plane, but ...
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2answers
60 views

Temperature Sensor Selection for temp range of 160C to 240C with 1C Accuracy

I am attempting to select a temperature sensor for a controlled heating application. The sensor will need to be inserted into a chamber with a cartridge heater and steel ball bearings inside of some ...
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1answer
83 views

Can Vias be used on the board for branching tracks?

I need to split the RST line in two directions and also connect it to the opposite layer of the board. I did it like this: Is branching the RST line the right decision?
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1answer
256 views

Figuring out convenient footprint for given actual lead spacings

This a beginner question, but I couldn't find an answer in net. I want to place the following components call it from left to right Cap1, Cap2 and Res on a PCB: As you see above I also mentioned the ...
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1answer
40 views

Why do PCI Express riser/adapter cards have electrical components?

I'm looking to make a custom PCI Express right angle adapter because the ones on the market don't work with my space constraints. Now, because it's basically an extension cable, I'd imagine it should ...
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0answers
46 views

Create Nixie tube pin connector socket in eagle cad

I am unsure how to properly layout a socket for a nixie tube in eagle cad. I'm especially unsure how to match the exact dimensions and what tool in eagle to use to create a hole with copper on both ...