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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How to design a multiplexed keyboard circuit for Arduino?

Hi all, I'm working on a project where I'm trying to read my calculators keyboard to know which key was pressed. I've decided over the past few days that hooking into the calculators PCB wasn't ...
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49 views

Track clearance with flex region cutout in Altium Designer

In Altium Designer, I created a simple rigid-flex board with the 4 layers in the rigid part (top, in1, in2, bottom) and 2 layers in the flexible part (in1, in2). I set 5mm clearance on a top layer ...
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56 views

Attaching sensors to PCB to minimize space

In my electronic product design project I need to come up with a completely finished product that can be presented in the market.What i'm designing is a turbidity meter with Arduino components with ...
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1answer
26 views

Altium problem when components placement

When i try to place the components in the schematic in altium, it looks like it is not allowed and the components became transparent as if it is not active
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28 views

Are Keep outs with height (3d keep outs) essentially keep In?

I have a translucent "keep out" box in my IDX file (NX) that sits on top of my PCBA. Does that mean the EE is only allowed to place components only within said box?
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61 views

Vias direct connect better than thermal relief ? Ground/Thermal

I am thinking about if there is a positive point on having vias which have a thermal relief connection to their respective planes? I know that for soldering pads it makes sense having less copper. ...
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28 views

What is the PAD size required for the Battery negative and Positive pads voltage (min 30v to max 42v) current (min 500 mA to max 15 A)?

I am creating a circuit for low voltage battery management systems (10s 1p 36v 2.5A battery pack). All the circuits is perfectly done from schematics to Layout. But i have small doubt in Battery ...
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53 views

How to use pattern tools in Eagle?

I need a large 18x10 grid of parts spaced by 15mm each on my pcbs, and I would like to use a pattern tool to do this efficiently. Maybe I have been spending too much time in Fusion 360 but I am ...
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165 views

Advice for 90 Ohm traces of a USB 2.0 HUB

I am designing a USB-hub that has many USB traces. I followed some guidelines online and read forums. Based on my understanding of a 4-layer stack-up, one of the best set-up I chose is 8 mil trace ...
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25 views

How to Bootload a custom STM32L4 Board?

I have designed my first custom board in KiCAD using STM32L452RE and I am planning to program using ST-LINK via SWD Pins but I am not familier with the process of bootloading the MCU. How can I ...
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33 views

USB power delivery and data transfer using type c

I have recently been designing a soldering station that uses Weller active tips and have become interested in using USB power delivery to power the station I have found the STUSB4500 which looks ...
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87 views

Can we use a ground plane and a VCC plane in a 2 Layer PCB?

I am designing a custom PCB of 2 Layer in the eagle CAD with SMD components. It is difficult to route the VCC and the ground for all the planes. I used a ground plane on one side. But for the VCC I ...
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34 views

In Altium Designer how do I navigate to the component editor from the PCB layout screen?

I am teaching myself Altium Designer 2017 coming from EAGLE. If I want to edit a component in EAGLE I can right click on it in the board view and then click "open footprint". Is there a similar ...
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Does the Altium model of this relay match the datasheet? TX2-5V - Solved - No

Altium offers this model when a Manufacturer part search is done for a Panasonic TX2-5V, notice that in the un-energized state pins 8 and 9 as well as 3 and 4 are contacted in the model. The ...
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29 views

Powering the BM833 module

Fanstel's BM833 module is built around Nordic's nRF52833 SoC. I have this very simple breakout designed: It has a ground plane on the top and on the bottom, with vias interspersed throughout the ...
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30 views

Integrating the ESP32 to a PCB

I need to integrate the ESP32 Module to a PCB. I went through the datasheets and example designs and designed it. I hope to use an external CH340G programmer to upload the program. So a header to ...
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41 views

PCB Power Input Protection/Filtering

I am designing a system that charges 8 LiFePO4 batteries in 8 channels at 1A each while measuring the current and voltage of the battery. I will need a total of 8A entering the 3"x12" PCB and another ...
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123 views

USB-C Connector: How to properly route on EAGLE CAD to supply power to PCB

So basically, I am needing to power my PCB using an additional USB 2.0 Type-C connector, but was having trouble understanding the pinout on eagle versus a typical USB Type-A where I could use VCC and ...
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39 views

Design a PCB with an elevated surface in the middle (KiCad)

I have designed a PCB where a device is glued and there will be wires bonded from the device to transmission lines on the PCB. I would like to have the bond pads on the PCB and device on an elevated ...
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70 views

Can I use a 18v solar output to charge a 4s lithium ion battery pack

So I have a couple of LG 18650 of 2200 mAh batteries each and a solar pannel that provides 18v output under load and 21 v under open condition. I'd like to build a 4s battery pack with a balanced bms ...
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70 views

Altium's 'Ignore pad to pad clearances within a footprint' inside CircuitMaker?

This is a related question to Autoroute or not? I have an option enabled in the Autorouter of CircuitMaker (Rip-up Violations After Routing), to prevent getting illegal routings. See below. As you ...
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15 views

Interfacing RN52 with SIM800C

I am interfacing an RN52 with SIM800C to make calls to and from the bluetooth device and so i have connected the speaker line of SIM800C to the mic of RN52 and the mic of SIM800C to the speaker of ...
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94 views

How to place SDRAM data-lane correctly in 4-layer PCB?

I'm thinking about the trace/lane ordering to 167Mhz SDRAM with 4-layer PCB: Now its follow: Data traces CLK (only) DQM traces Address + control + command (Ax + BAx + Strobes and CKE) Is it better ...
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39 views

Access B Channel on HX711 Amplifier + ADC

I am trying to access the B-channel on the HX711 (datasheet) on my own PCB. The pins for the B-channel on the HX711 are INPB/IN+ and INNB/INB- The schematic in the datasheet shows the circuit for ...
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61 views

Eagle PCB Autoroute Heating Track

For a project I am currently designing a heating PCB, which will heat up an aluminium block. On this PCB there is also a MCU and the electronics to control the heating. Because the PCB has only ...
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44 views

Solder pad size and relative position for soldering board with castellated pads

I want to solder a Arduino Nano on top of another board designed by me. For this I want to use the castellated pads on the Arduino Nano board. But I am not sure how the solder pads on my board have to ...
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1answer
40 views

Certifications required for a circuit board/ product

I am developing a product that uses a bluetooth module (rigardo bmd-350 based off of the nrf52832) has a daughter/breakout board for interfacing with eeprom chips, pumps powered by small dc motors, ...
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81 views

Electric Skateboard Remote Control Schematic

Picture below is the PCB of Xiaomi Acton Electric Skateboard Remote Control. Basically it is 2,4 GHz transmitter, transmitting the value of a potensiometer (throttle). Normally when the switch ON, the ...
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1answer
144 views

How to fix a short circuit?

I found two vias that were supposed to connect to two leads of a capacitor were shorted together on a 4-layer PCB. One of the vias is connected to ground. They are not shorted in the KiCAD model (...
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21 views

LED driver logic, analog & power grounds & signal integrity

I am using a TLC920 LED driver and it has three ground pins: Logic, Analog and LED. What are some best practices for a layout with these? All three with be joined somewhere and my understanding is ...
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20 views

how to import mentor pcb file into Altium Designer

I have one PCB file downloaded from the Internet. I want to use the PCB file on Altium. As the Schematic file is DSN, I think this PCB is a Mentor PCB file. File Extension is *.pcb. I tried to import ...
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32 views

PCB-To-Cable connector for power and bus line

My current design has Power cable: 3 pair (max 2A) Bus cable: 4 pair and shielded Distance: ~1-20m between the slave PCBs I am having trouble finding a suitable connector for the PCB and cable For ...
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25 views

How to move a group by name in Eagle

I do need to move some components in my pcb board, I would like to do it by selecting all the components with a specific name, doing a group and then moving them all together. I mean let's say I do ...
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1answer
27 views

Trace impedance on 4layers (Top and internal_plane_1)

I'm currently design a 4layers pcb with 50r trace for an Ceramic chip antenna (on top layer). Due of a lot of trace, my trace antenna is a coplanar. Trace on top layer with polygon pour around AND ...
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1answer
33 views

Lumped model not applying to PCBs

Recently I have heard that KCL and KVL do not fully apply when performing electrical measurement on PCB traces. It was implied that PCBs are not completely lumped circuits - that is, we cannot assume ...
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1answer
94 views

Altium Design, can't change track width

I have hit 3 while tracing, I have hit shift w to open my favorites and it shows me favorites, but for some reason the program will not change the width of traces. It is stuck at 10mil. Anyone know ...
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93 views

60079-11 / 7 PCB layout design rules

Is there a PCB guideline paper or book that discusses how to design PCB layout and components that meet IEC60079 (-0, -11, -7) and how to limits the use of encapsulation or conformal coating. In my ...
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138 views

Altium symbols/footprints for components with multiple physical parts

What is the best way to build/use Altium (or other software) parts that have multiple physical pieces. This could be multiple footprints that work as a set, it could be multiple MPNs that form an ...
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75 views

HDMI Development: What Would Cause Thin Pink Lines?

I recently designed a board which produces an HDMI output for an oscilloscope so it is viewable on an external monitor. My prototypes seemed to work just fine with one or two mod wires. However, after ...
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31 views

Master Control Unit Design

I am designing MCU Board with four layers stackup 1. signal. 2. GND. 3. PWR. 4. Signal This board will supply six Radar sensors each with (12V and 4A maximum current), this board have a power ...
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77 views

Wavelength on microstrip line

I am trying to calculate the wavelength on microstrip transmission lines. From what I have understand I should use the following relationship: \$ l = c/(f*\sqrt(Er))\$ where Er is the dielectric ...
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1answer
147 views

Need help on troubleshooting PCB circuit

I recently got a freelancer to design a push-button latching circuit that powers a 12VDC motor from a 1S1P Li-Po cell. I have soldered all the components but the board does not seem to work properly. ...
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107 views

Component Height - Altium Designer

I'm using Altium Designer version 14.2. I am making a thermal analysis. The Analyze program expects a ODB++ format input from me. When I convert my PCB to ODB++, I can't see any height information ...
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108 views

Bluetooth module PCB layout

On my PCB, I have the Bluetooth module (ANNA-B112) on the top layer. Due to space constraints, I had to put some components on the Bottom layer of the PCB beneath the Bluetooth module. The main ...
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2answers
591 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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26 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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183 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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59 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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61 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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2answers
61 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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