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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66 views

Strange powerplane layering issue in designspark

I'm trying to order a 6 layer PCB from a fab but they are asking me to resolve an issue with the file and I'm a bit stumped on what to do about it. The second layer of the design I have designated as ...
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271 views

Altium Designer update nets in SchDoc from PcbDoc

I have an Altium Designer project with a PcbDoc and a SchDoc file. For some reason a few nets (connections) in PcbDoc are not present in SchDoc. Can I update SchDoc from PcbDoc so that schematic ...
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141 views

Routing the main power supply across a PCB and choosing vias for it

I have a board that uses several different switching converters with 33uH ferrite beads that take up a fair amount of space. I'd originally intended to keep them all at the top of the board (not top ...
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162 views

Does a Vcc layer cause noise to a 4-layer RF PCB?

I'm designing a 4 layer GPS tracker PCB with the 2nd layer as ground and 3rd as Vcc. Is this a good practice? I know a gnd layer is good but I'm not sure how to distribute the positive of the supply ...
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64 views

Acceptable Buck Converter Output

I've just put together my first busk converter with a LMR16006Y-Q1. http://www.ti.com/lit/ds/symlink/lmr16006y-q1.pdf Here is what it looks like on the scope. The Pink signal is unloaded, the other ...
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147 views

Reversed silk screening on EasyEDA

Just a quick one. I'm not sure if the text should be mirrored on the bottom layer of EasyEDA. It seems okay in the 3D preview, but when I upload the gerber to JLC their preview shows it still reversed....
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165 views

Accidentally Pasted Beyond Origin in Altium

I'm new in Altium and I accidentally pasted some pads and components(the ones at the bottom corner) from another pcb file but I wasn't aware of it at first because it didn't show on the sheet on the ...
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796 views

Custom Arduino powered board (CH340C) Serial Problem

I made this custom board that contains a complete arduino nano on it. I soldered every component with extreme care and already check all the connections and they all go according to the designed ...
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225 views

Put the crystal on the bottom with thru-vias, or on the top with a blind via?

I'm using an STM32L155 in a very small (0.4 mm pitch) WLCSP package (6x9 array). At this scale there is no room for traces between the balls, so the design requires HDI and/or blind vias to fanout the ...
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569 views

Faulty H-Bridge Design L9110s

I am trying to integrate a dual h-bridge design in to my custom PCB (Arduino Nano with integrated motor driver) using the L9110s IC. However, I am struggling to get it working properly. The h-bridge ...
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256 views

4 layer board stack-up and some question related to power layer

I've got some questions regarding my stack-up and power layer, which is layer 3 on my PCB. But before I ask my question I will describe my PCB. Most components are SMD parts (capacitors etc.). Top ...
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3k views

Metal Detector using IC 555 Timer project

I want to build some project about metal detector using integrated circuit 555 timer. I already made a schematic in proteus 8 application. I made some change with the original schematic i found on ...
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1answer
280 views

How to query wires that are connected to selected component in Altium Designer?

I want to apply special rule only to components with myFootprint and all connected wires to it. AD can select all components with that footprint with this query HasFootprint('myFootprint'). I also ...
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235 views

Has anyone ever seen this transmission line setup (double series terminated)?

I am designing a custom PCB interface to be used with some off-the-shelf devices. The relevant off-the-shelf interface they provide is cumbersome and doesn't fit my application, so I am designing my ...
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425 views

Most cost effective 6 layer stack setup?

I've been trying to come up with a 6 layer PCB layout with microvias. But I cannot think of a cost optimized layer stack, because every manufacturer seems to tell me something different on their ...
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42 views

While performing the controlled impedance routing what about the current flowing through it?

While calculating the conductor impedance the parameters that we consider are the conductor width, conductor thickness, frequency & substrate parameters. For achieving the particular impedance ...
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114 views

ESD (and EMI) protect long slow lines

I'm designing a measurement and control board to interface with an old (70s) PLC. The board consists mainly of I/O ports, both analog and digital in- and outputs. To have my boards not fried by the ...
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71 views

Large full planes, or moated sections, which is more quiet?

Take a six layer PCB with lots of circuitry, smaller than you'd like, parts on both sides, with very sensitive amplifiers looking for RF signals in the 100nV range, and digital circuitry. Top layer, ...
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106 views

What can I do to avoid impedance discontinuity when high-speed signal bifurcates on PCB?

As mentioned before, I want to supply two PCBs with same-frequency clock(as high as 10GHz).But now there is only one pair of differential clock, while both of the PCBs need one. So I am thinking of ...
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2k views

Coppers Pours for 4-Layer RF (433MHz) Board?

I've got a 4-layer prototype transmitter board built that is using a low-speed MCU (2 MHz). The critical RF sections are 50 ohm impedance matched to the board's characteristics. I eliminated the GND ...
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297 views

Can I use meander antenna as show in below pic

I wondering will above antenna work properly or not because most of the PCB design layout antenna directed in right side & feed length remain unchanged. As per as I know, feed length does not ...
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681 views

Power supply of board based on tp4056 with protection gives too low voltage

I have a project on small pocket board with a Li-Ion battery so I made a pcb with power section based on a tp4056 board (with protection), with LP2985IM5X-3.3 stabilizer. TP4056 charges the Li-ion and ...
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404 views

I2C lines coupled?

I am using a 5k pullup resistor on my SDA and SCL lines. I am using a 62kHz clock signal on SCL. I have made two boards so far. For the first board I routed all the traces myself, but for the second I ...
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426 views

PCB Return Current Path Question

I understand that the return current will use the closest plane to the signal trace. So could you give me answers on these 2 specific conditions. 1)When we have lets say 4 layers where layer 1 2 3 ...
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167 views

PCB layout help for MEMS oscillators and clock drivers

I have this SIT8009 MEMS oscillator at 125MHz frequency (also the same with an OSC52 from SiWard at 25MHz) followed by a 1-to-4 clock driver to distrubute the clock to multiple ICs. When layouting, I ...
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812 views

Micro-USB connector in middle of PCB?

I have a unique situation where I may want to place a Micro-USB connector on a PCB, but not on the board edge. Mechanically, it would make sense if I could place it towards the middle of the board. ...
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649 views

EM interference with hall effect sensor

When using a hall effect sensor like this one, naturally, it will be pretty close to a rapidly changing magnetic field. This means that the analog signal line coming out of the sensor will also be ...
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350 views

Switching problems in class D amplifier

I'm building a class D amplifier with a dsPIC as PWM modulator. The part of the schematic that I want to talk about is the interaction between the microcontroller output (pwm signal) and the gate of ...
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382 views

Problem when debugging ethernet KSZ8081RNB chip on IMX6UL board

I've been working on debugging KSZ8081RNB Ethernet chip for three weeks now and still, I can't find where the problem is. First of all, the board I am working on is including an IMX6UL processor and ...
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569 views

PCB isolation strength VS pad-to-pad distance

Is there any estimation regarding the relation between PCB pad to pad distance and isolation strength? If the board is covered with the mask and the minimum distance is 2,9 mm which isolation voltage ...
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368 views

What is the common cause of short circuit in PCB design

In PCB design there is some clearance and creepage distances to respect according to the UL 60950 standard for example, I want to know why this distances need to be respected in PCB design, what is ...
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513 views

Multiple (independent) circuits on the same PCB in Multisim/Ultiboard

I have designed and simulated a few circuits on Multisim. Usually, I order a PCB for the layout of each circuit independently. However, it is cost-effective to put multiple circuits on the same board (...
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370 views

over-heating with AMS1117-1225L

When connected an external voltage to vout of this 5v regulator, the chip get very hot. I connected a 4v to its Vout, and it draws 500ma. The protection diode from vout to vin doesn't help. My doubt ...
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1k views

Switching power supply layout review

In a previous question where a SMPS based on an LM5118 was presented, some aspects of the layout were pointed out as being problematic. I've taken another look at the layout of that section of the ...
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171 views

Text LCD doesn't function normally on mixed-signal PCB?

I have power supply, analog part and microcontroller part on one 2-layer PCB board, very simple. The LCD is on the microcontroller part. It works normally when I have it on a separate board with only ...
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793 views

PCB Ground and Power Plane Design Guidelines

I am converting a design from through hole components to SMT components. The schematic is identical, except the maximum allowable current through an onboard relay will be halved from 20A to 10A. ...
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162 views

Cooling the IC on a board printed by hand

I'm building a battery charger circuit with BQ24278. The battery draws 500mA minimum and 2.5A maximum current; therefore, I must prevent IC from overheating. I printed the board onto single sided ...
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376 views

Improving PCB layout for regulator circuit

I've made a layout around an Allegro A4490 triple buck regulator, with four optimization goals: minimize loop area/change in area when switching keep the ground attachment of the input and output ...
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428 views

funny shaped footprint pads & PCB123

I am using PCB123 to do a PCB layout and I have a part with some oddly shaped pads specified in the part's recommended footprint. It seems that in the footprint editor, there are only 3 options for ...
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110 views

KiCad - what does this syntax Highlighitng mean, why can't connections be made?

Everything turns yellow and it won't let me make ANY connections in Pcbnew. Does anyone know why this is? Also, when I import the netlist, there are no rat's nest! This is the diagram, but I was ...
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905 views

Ground loops on single trace in the middle of a ground plane

I'm trying to optimize the layout of a MAX1979 TEC driver on a double sided PCB. Is the placement of single, small traces in the middle of a ground place, as seen below on the bottom side of the ...
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511 views

How to create a footprint with a pad on the component side in gEDA pcb

I've read a bunch of tutorials, but can't figure out how to do this. What I want is a pin where the pad is on the component side instead of the solder side and the hole is plated so that it can be ...
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172 views

Ground plane and magnets

I am making a wheel encoder out of a Hall Effect sensor with magnets in a concentric circle on the wheel. The Hall effect sensor is on a 2-layer 9x5mm pcb. I usually fill in the layers by drawing a ...
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231 views

Optimizing geometric dimensions of the stripline in AWR DE (Microwave Office) or similar software

I'm designing a stripline step inductance to compensate the capacitive impedance. My goal is to minify the WSVR parameter of the port and I may vary the dimensions of the stripline (widths and length) ...
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28 views

Are there any generally acceptable UART best practices when it comes to hardware design

Are there any generally acceptable UART best practices when it comes to hardware. Hi, I am trying to design a PCB that uses UART to communicate between two microcontrollers. Are there any generally ...
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36 views

Problem with CH340C

Hi I made a board that contains an ESP32-WROVER and an USB to serial adapter ch340c but it's not visible when I connect it to the PC (Windows 10). I tried to install the ch340 driver and I even tried ...
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51 views

CN3722 solar charging IC not working properly

I'm currently working on a custom PCB where I have a microcontroller hooked up to 3 LiIon batteries which are meant to get charged by a CN3722 IC. However, when I connect a solar panel to the circuit ...
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17 views

Ferrite underlay impact on chip antenna performance

I'm designing a small wireless chargeable IoT device which also has TX/RX in subGhz frequency (LoRa). The idea is to stack everything on top of each other starting with charger RX coil, then ferrite ...
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31 views

Incorporating Additional Devices in Custom PCB

I've been tasked with designing a custom PCB based on a prototype I made this past year. This prototype uses ST's NUCLEO-F030R8T6 development board along with some stepper motor drivers (AMIS-30543) ...
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2answers
29 views

PLL Layout guidelines

I am designing a custom board using HMC833LP6GE. I am taking schematic reference from the Evaluation module. There will be onboard DS-PIC MCU for controlling the PLL. The reference input can be fed ...

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