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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1answer
52 views

Who is creating/maintaining the Unified components for PCB?

In Altium, I noticed that there are 'Unified components' - the repository that contains symbols/footprints that are already created. I am keen to know more about this repository. Who is maintaining it?...
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1answer
71 views

Need help understanding a portion of the Arduino Mega 2560 schematic

I'm planning to build a custom Arduino Mega PCB, so I downloaded the schematics and design files. For the schematic, I have a fairly good understanding of the connections, components, and their ...
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1answer
45 views

How to connect 50 A 12AWG cable to a shunt resistor in PCB?

I'm designing a PCB in which the current of a BLDC motor is measured through a PSG4NTEBL500F shunt resistor. The DC supply of the motor is connected to the PCB through a 12AWG cable and the circuit ...
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0answers
20 views
+100

Proteus Autorouter Not Using Ground Plane

I've created a ground plane on my Proteus schematic but for some reason the autorouter is totally ignoring it and trying to link all of the ground connections with traces. How do I fix this and force ...
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2answers
74 views
+50

Is it safe to have a ground plane under a Bluetooth module for a DC-DC converter?

I am finishing up routing a 4 layer DC-DC converter PCB. My concern right now is whether or not it is safe to have a ground plane directly under a Bluetooth module on my PCB. Since this is a switching ...
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1answer
28 views

Altium automatically adds footprint to new library component. How to solve it?

I have a problem with Altium and i couldn't solve it. When I add new symbol to my integrated library, by default it has 6 footprints and the symbol designator and comment is same every time (not ...
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4answers
93 views

PCB features that cause EMC problems and track on ground plane for return current

If I have understood correctly the return current for AC voltages will follow the red signal track but on the ground plane. For DC voltages the return current will spread out across the ground plane. ...
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0answers
34 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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0answers
45 views

Which software for PCB CAD design do you prefer? Which software do you use for your projects? [closed]

I have always used Eagle for my designs because it is free, well supported and nice UI. Recently I received a design in Kidcad which I tried to export to Eagle but I was unable to do so. Then I ...
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1answer
54 views

How to round all corners on a PCB in Altiium

All my PCB's have round corners, so you can't hurt yourself, and so it is easier to fit it into a rack. Now with altium i always have drag the edges in the Board Shape Editor to make them round. I ...
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0answers
34 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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7answers
5k views

Autoroute or not?

I made a fairly complex circuit (at least for my level). After spending a few hours trying to manually autoroute, I had like only 5% finished, and every time run into obstacles of not being able to ...
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0answers
31 views

Battery Management Systems for 10s 36v 2.5Ah Battery Pack

In future I would like to design a Battery Management systems for the battery packs used in Electric Vehicles. For that now as a start i would like to design a Battery Management system for 10s 36v ...
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2answers
56 views

When ESD protection is necessary and where should TVS be placed?

I'm designing a PCB in which the main ICs are a STM32F0 microcontroller and an INA226. These IC have some IO pins exposed in a header and the device will be handled by people. Is it likely that an ...
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1answer
20 views

CircuitMaker: part without any net, how come?

I have a circuit made in CircuitMaker, below is a fragment: This is connected via I2C to the MCU: However, when importing the parts in the PCB, there are no connections made: When I remove the J6 ...
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2answers
147 views

What's the best ground topology for this mixed signal board?

I'm designing a 4 layer mixed signal PCB with sensitive analog circuits and RF-digital circuits. The board have many mechanical constraints so the places of the analog and digital circuits are fixed. ...
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2answers
71 views

selecting the correct battery [closed]

I am trying to design a circuit on a PCB whose supply voltage needs to be 3.3 V. Currently I have two options: Use three AA batteries of 1.5 V each to obtain 4.5 V, then use a converter/regulator to ...
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2answers
103 views

Beginner questions, 230v switch on PCB

I've designed some PCB's in the past but never really had to worry about load and safety. Now I need to build a small PCB with some 230v AC cirquits. The load will be minimal, but still I have healthy ...
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0answers
13 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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2answers
60 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 ...
1
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2answers
132 views

Can I submit bitmaps to be used for PCB silkscreen?

I have an image which I would like to silkscreen on my PCB. It's quite detailed and when I import it into my editor (I am using the easyEDA web editor) the software simplifies it before it imports it. ...
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1answer
40 views

Schottky diodes in series to reduce maximum voltage at supercapacitor solar charging circuit

I use the following circuit to store solar energy harvested by photodiodes into a supercapacitor. The cap is rated at maximum 2.8V. The zener diode is rated at 3V, but depending on the harvested solar ...
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0answers
18 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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2answers
56 views

What chemical is used as a developer in UV sensitive film PCB manufacture?

I recently learned of PCB manufacturing using UV sensitive/photosensitive dry film. In many videos they use a solution, made using  powder chemical (sodium carbonate mentioned in some videos) to ...
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0answers
44 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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3answers
4k views

Are alternate connection points on a PCB bad? [closed]

If a PCB is designed to provide two connection options for the same signal, for example it has a banana plug connector on one side of the PCB but also exposes the same signal on another side of the ...
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0answers
18 views

How to draw xh 2pin connector on pcb silkscreen

I want to now how to draw the xh-2pin male pinheader connector on the pcb silkscreen How to refer to the open window wall side? Thanks in advance.
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0answers
50 views

SMD oscillator and decoupling caps placement/routing

I want to design a four-layer board with a PIC32MM0256GPM048T microcontroller. All components must be on the top of the board. I tried routing OSC1 (osc in) and OSC2 (osc out) lines, and placing the ...
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0answers
28 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 ...
1
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1answer
63 views

How to know if test points can introduce EMC problems

After getting some advices from my PCB manufacturer and from people here, I decided to change the PCB design I'm working on so the PCB could be tested using a bed of nails. To do so, I added test ...
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1answer
37 views

Remove/exclude exposed pad of QFN package from PCB layout

I am doing a PCB layout with a Atmel/Microchip MCU ATSAML21E18B-MUT‎ which has QFN-32 package 5x5mm. This board can have a maximum of 20x40mm and I am having problems with space because the circuit is ...
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7answers
9k views

PCB Design: Strange 'whiskers' from PCB pads?

Regarding the attached PCB image, you'll notice that there are odd 'whiskers' from PCB pads. I'm curious as to their purpose. The board isn't high frequency, so I doubt it's for any fancy RF-magic. ...
3
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1answer
77 views

Mains voltage PCB design [closed]

I am trying to design a PCB with AC mains which is going to be controlled using relays to turn on fans and heater. I have never designed PCB for AC. What should I look out for and what should I be ...
0
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2answers
107 views

PCB Technique for Disconnecting Decoupling Capacitors

I'm working on a PCB design for an FPGA chip where I want to do power analysis and voltage fault injection. Because of that I want to minimize the decoupling capacitance of this chip, but of course it ...
0
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1answer
38 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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1answer
63 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 ...
0
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1answer
54 views

What should I use to filter noise from 5V power supply with multiple consumers

I want to create a PCB board that would have: input - 5V wall outlet USB charger or for example MeanWell Din power supply output - 3 usb ports that would be used by RPI-like devices. (5V 2A max each)...
0
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1answer
58 views

STM32F401 Hardware design

Last days i decided to use stm32 chips.I am reading stm32f401 datasheet to design my hardware but below the schematic there is a statement " The 4.7 µF ceramic capacitor must be connected to one of ...
0
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1answer
48 views

Swap immune connector

I need to come up with a swap immune connector for a project of mine, and I can't come up with a simple design. The connector is supposed to connect PCBs of the same kind, however, an upside-down swap ...
0
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3answers
48 views

How to route and solder TO-263AB packages?

Am working on making a PCB and i was using RFP30N06LE MOSFET on my breadboard circuit, now that am making a PCB i want to use the other variation RF1S30N06LESM of the same component. which as you can ...
0
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1answer
112 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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2answers
97 views

Rogue resistance between Vout and GND in LDO circuit

I'm currently developing a circuit as seen here:. I had some suggestions to check my Iout to ensure that I wasn't drawing so much current that I was causing an overheat. After a little checking I ...
0
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4answers
96 views

Voltage Regulator Overheating

I'm currently designing a simple PCB that uses a MAX3221 to send/receive RS232 over an ethernet cable along with an optional 1-wire thermocouple reading (The thermocouple breakout can be soldered in ...
3
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1answer
160 views

Routing strategy - 24-bit RGB display on a 4 layer PCB

I'm routing traces between a microcontroller and a TFT display (24-bit RGB, clock frequency at 18 MHz).The stackup is: L1 - Signal L2 - GND (solid layer) L3 - PWR (solid 3.3V in the region of ...
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0answers
43 views

Some of LEDs connected in series remain on

I know that even tiny leakage currents can make an LED glow weakly and there are many answers to similar questions, but my problem is different. I have 6 power LEDs connected in series and they are ...
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0answers
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 ...
0
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2answers
82 views

Are all the DIP-16 packages the same for PCB library design?

I am designing PCB library for a component whose Package is DIP-16. I have already footprint of this Package in other components. Can I use them interchangeably in the new component in terms of their ...
0
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0answers
19 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 ...
0
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0answers
29 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 ...
0
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4answers
108 views

Supporting SMT electrolytic capacitors in high vibration environments

I recently experienced a situation where an engine ECU failed. The post-failure analysis showed that two capacitors had broken loose from the board due to stress from vibration. I have replaced the ...

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