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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18 views

Integrating USB C Power Delivery into a PCB

I am aware of USB C Power Delivery trigger boards that uses PD protocol to output the desired voltage from a PD source. But I was curious if it would be possible and feasible to design and integrate a ...
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1answer
20 views

Net name requirement for PCB design on upverter

I am using Upverter to do my PCB design. Whenever I have 3 or more connections on a net, it shows me a warning saying that I need to explicitly name it. I would like to know if this is just a quirk ...
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53 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
29 views

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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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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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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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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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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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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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
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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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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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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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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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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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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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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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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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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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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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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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
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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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 ...
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0answers
46 views

UART communication not working without injecting voltage in pin headers

I have a bluetooth module (rn4020) talking via UART to a stm32f103c8t6 MCU in a custom PCB, I also have an OLED screen and some pin headers for listening what either module receives (as seen in the ...
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1answer
57 views

Oscillator connection

I have two questions here for how to connect the oscillator to a microcontroller (SPC584b): How can I determine the values of the capacitors? What is the need of SB2 & SB3?
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33 views

Controlling a series of LEDs ( AC->DC via bridge rectifier)

I'm working on a PCB (Christmas Present) to take in A/C to a string of LEDs and control them (with transistors? and a microcontroller). This is a bit out of my league, but it is making me learn ...
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1answer
62 views

Designing PCB with AC Live and Neutral on two layers

I'm designing a smart socket that will route 240V AC Live and Neutral to a voltage regulator and also to a relay that will control the current flow. Due to the limited space, it will be easier to ...
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33 views

Making a more efficient replacement for my diode

I am making a boost converter using the LM3481 IC (although it might be considered a sepic topology as well). Typically in a boost topology, you put a diode before the output capacitors so they don't ...
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3answers
1k views

Traces in connector's solder keep out area

I'm designing with a Molex 87438-0443 connector whose PCB footprint includes a 'solder keep out area' between each pair of copper pads for each connector lead. It appears that the manufacturer wanted ...
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2answers
39 views

Plane Splitting - Single winding AC to dual rail on the same board as preamps

So I have asked a similar question and was wondering if I could trouble you guys for a little more advice. I believe I have taken all of the advice from before into account. Ill get right into it. ...
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1answer
78 views

PCB Pads vs Components Footprints in PCB design

I want to understand the process of PCB design using a software like Altium. I have come across two approaches as follows: Approach 1: While making the component parts library we make the footprints ...
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60 views

Ground Planes, 0v or GND?

I have a board that has a dual voltage isolated DC-DC converter on it. The converter takes 0 an 5v in and gives -5,0,5 v out. The 0v of the input is actual ground. Most of the PCB uses the isolated ...
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0answers
33 views

Is it ok to put GND and VDD pours below IC (AS7265x)

I am designing a PCB to use with the AS7265x sensors. The datasheet states, on page 51: In order to prevent interference, avoid trace routing feedthroughs with exposure directly under the AS7265x ...
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5answers
7k views

Why do some PCBs have the courtyard in the silkscreen layer?

I've seen quite a lot of PCBs which have the passive components outlined all the way in their silkscreen. Something like this: Here there is an outline around each passive which goes (almost) all ...
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1answer
30 views

Altium Designer multi sheet design quad op amp

I have to design an multi channel sampling device: there is an input stage with some filters, then digitization of them and some supplementary circuit. To create a filter, I want to use quad op amp, ...
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24 views

Parasitic Inductance - DPT circuit

I have a question about parasitic inductances. Let's take the figure below as an example, a DPT circuit is shown here. I have added an inductor (parasitic loop inductance). I would like to have a ...