Questions tagged [pcb]

PCB is the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.

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Rigid-Flex PCB Fabrication: Window opening vs slot opening

We had issue with one of the rigid-flex design cracking at the joint of Rigid and flex intersection. It is important to note that this is second batch of same PCB and PCB was not cracking in first ...
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5 votes
2 answers
172 views

USB connector always reverse to connections on the IC

I'm looking to add an interface IC on to my PCB. The chip will interface through a USB B Micro connector. What I don't understand is why all the ICs I have found are designed so that the D+ and D- ...
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4 votes
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Custom RP2040 PCB Not Detected by PC

I designed a custom RP2040 to control some 24V LED strips. The official hardware design guide from the Raspberry Pi Foundation is what I followed for my design. It was then sent out to JLCPCB for the ...
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Invisible magic components that spoil the Eagle preview

You know, after the eagle board design is finished, you can see the card on the preview screen. I'll show you two examples. There is no problem with one. The card is centered on the preview screen. ...
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4 votes
1 answer
338 views

How to reconnect to potential of ripped off solder pad without visible circuit traces

I am trying to get a data backup from a broken LG/Google Nexus 5 smartphone. It was repeating in a boot loop, because the on-switch was stuck at always on. I dismantled the mainboard. Here is a ...
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3 votes
1 answer
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Why did the liquid tin evaporate off my board when soldering?

On the weekend I designed and etched a tiny little 12V booster circuit for an OLED. To prevent the traces from oxidising in the future, I removed the leftover ink after etching and placed the board in ...
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  • 542
3 votes
1 answer
181 views

Fusing guidance for mains on PCB

First of all sorry for the lengthy post - I'm trying to give as much info as I can. I’m currently designing a PCB for a wall-mounted control unit which has control logic and mains switching/detection. ...
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  • 31
3 votes
1 answer
434 views

Nvidia 1080 ti VRM? SMD Identification

I was hoping that some of you experts could help me identify a SMD on the back of a 1080 ti FE. This item was dropped and it appears has some damage done to it. I would like to replace the missing SMD ...
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3 votes
0 answers
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Does through-hole mounting have an advantage over surface mounting in sub-zero temperatures?

I am working on a device that I want to work outdoors far up north (e.g. on a farm), maybe down to -40C. I read a lot about through-hole circuit boards being more resistant to environmental stress ...
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3 votes
0 answers
246 views

Enclosure/boxes for high voltage PCB

It is time to choose the proper enclosure for a high voltage PCB. We will need to do holes for LV external connectors and external connectors for high voltage wires. I was looking for standard boxes ...
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  • 613
3 votes
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How to distribuite high current in multilayer PCBs

I'm designing a 150Amp controlled rectifier and I'd like to know how to distribute the current using a multilayer design. Currently, I have a 4 layer design containing: Top Layer: 6oz, Vdc+ and Vdc-...
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  • 31
3 votes
1 answer
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How can I reshape this PCB antenna so that I can still use it with the given circuit?

I'm borrowing the RF design from the MICRF114 Development Kit. Here's user guide- http://ww1.microchip.com/downloads/en/DeviceDoc/50002433A.pdf The circuit I'm using is on p. 35 and the antenna ...
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3 votes
0 answers
111 views

silkscreen artifacts on pcb

I often see silkscreen prints between pads on pcbs. Especially I noticed this on "high voltage" designs (SMPS). What is the reason for that? Maybe it is to improve automatic inspection prevent for ...
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  • 31
3 votes
0 answers
1k views

STM32F429ZIT6 with SDRAM IS42S16320F Read/Write Issue

I designed a board which is containing two SDRAM (IS42S16320F) and STM32F476ZIT6 MCU (and other components also). I can access the SDRAM but the data is changing independently from the code. My board ...
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3 votes
0 answers
699 views

PCB trace caps (a.k.a. finger / interdigital caps) formula

I am trying to calculate a two-fingered, both on the same layer, capacitor. I have run into a few papers on it but they are taking a ground plane on the other side of the PCB into consideration and ...
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  • 866
3 votes
2 answers
340 views

P-MOSFET Dropper-Switch - Linear Region

I'm repairing an ECU board from a SCANIA generator. It works with 24Vdc, and on the last maintenance the technician powered it with 220Vac, so it blew up some components. I've managed to replace the ...
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  • 488
3 votes
0 answers
2k views

Capacitive touch sensor design

I made a PCB with several capacitive pads to be read by IQS127. They work, but any material I put close to the PCB surface will trigger the output, even the 8 mm glass I'm going to use. The pads ...
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3 votes
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221 views

PCB layouts and polygon pours

I have been told that when laying out a PCB to keep all the polygon pours uniform on each layer. So, for example, in a corner of the PCB, you do not want the pour on one layer slightly offset relative ...
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  • 190
3 votes
0 answers
112 views

LM4510 Switching Converter not working

I am using a TI LM4510 converter (datasheet) to step up from 5V to 12V (adjustable). I have good input power, enabled chip, and followed datasheet, but the output voltage is actually lower than the ...
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  • 347
3 votes
0 answers
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Qi Receiver on PCB

I'm looking at implementing Qi charging in my project, would it be possible to have a Qi receiver directly on the back of the PCB (copper traces in the shape of a coil)? Could this interfere with the ...
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  • 39
3 votes
1 answer
194 views

What is this breadboard that can be soldered on a PCB

Very simple question. What is the part number of this small bread board on this board. There are two breadboards on it. The smaller one actually is soldered on the PCB and it is connected to IOs of ...
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  • 117
2 votes
0 answers
34 views

Connector identification for Avermedia C875

I have an AverMedia C875 device, I would like to capture an analog output of my VCR with it. The device has a specific connector for such purposes, but I sadly don't have the dongle that originally ...
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2 votes
0 answers
85 views

Moving BGA pads 0.01mm and making them smaller to work with JLCPCB capabilities

JLCPCB has requirements that mean some BGA packages can't be used because of minimum via size and minimum track spacing and sizes of pads to vis etc. To overcome this I came up with an idea that in ...
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2 votes
0 answers
58 views

Blocking BLE Chip Antenna from picking up signals in one direction

I am designing a BLE scanner/observer which uses a ceramic antenna. I was wondering if there is any way to design the PCB such that the antenna chip only picks up signals from in front of it instead ...
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  • 21
2 votes
0 answers
46 views

Circuit to Disable 24VDC to Load via +24VDC Logic Output

I have a load that is powered by a +24VDC source. The load can draw a max of 400mA. I would like a simple and effective circuit to disable power when a 0-24VDC logic signal is high; in addition, I ...
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  • 21
2 votes
0 answers
77 views

Will my design work to program an ESP8285 IC?

Will this design work to program an ESP8285? I was trying to design an ESP8285 development board for the first time. Before sending the design to manufacturing I would like to know whether or not the ...
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2 votes
0 answers
137 views

Esp32 rf design review

Preamble: this is the first time I'm working in rf circuit design, I went simple and I hope I didn't make any silly mistakes, but I still have some doubts. I am currently designing a garden programmer ...
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  • 135
2 votes
0 answers
68 views

RF PCB Layout for 915Mhz + BLE: Which is better?

I am designing a small board with a 915Mhz transceiver IC breakout (based on the CC1101 + CC1190 chipsets), controlled by an STM32. I have used the popular nrf24l01 chipset in the past, but was ...
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  • 2,081
2 votes
0 answers
66 views

oscillators tolerance to ultrasonic cleaning

I use clock oscillators like ACHL-10.000MHZ in pretty much any board that contains a micro-controller. Recently, I've started using MEMS clock oscillators like AMPMAFB-33.0000T for their claimed ...
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  • 179
2 votes
3 answers
189 views

Switch design for shorting the power control pins?

I have been struggling to design this switch for a while and I would appreciate any help. Problem Background: I'm designing a power system for a submersible, using the Mini-box OpenUPS battery ...
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2 votes
1 answer
57 views

What is the name of these connectors? (XBee Radio Module)

I'm migrating a design from an older through hole module, to a new module that has edge connectors. The dev kit has these nice spring loaded connectors on the carrier board where the module just pops ...
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2 votes
0 answers
201 views

Is there a Kicad Library loader for Linux?

I am using Designspark pcb with Library loader for years now. Library loader lets me import and use any footprint instantly once I download it. But I want to switch to Linux with KiCad, and I want an ...
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2 votes
0 answers
79 views

What tools can I use for PCB making at home?

I want to create my own PCBs for prototyping and hobby purposes. I have experimented with buying them in China, which is cheap but not very fast. No idea on the quality either, but for $5 for 5 boards,...
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2 votes
0 answers
54 views

Capacitive Touch Pad Design with TTP224 ic

I am designing circular capacitive touch pads of Dia:20mm driving from TTP224 IC on my PCB. There will be 2mm glass panel above Touch pads. My PCB contains other circuits like Arduino, Antenna bands ...
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2 votes
0 answers
85 views

PCB quick question

I'm getting close to pulling the trigger on ordering PCB etc. for a project, and I'm looking at about a dozen DIP sockets on the board. The small 7-segment displays I'm looking at have pretty spendy ...
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2 votes
0 answers
39 views

Feed protection to the Mosfet drains

I have a machine running three 12v solenoid coils. Currently, control is carried out by manual switching of the negative through SPDT toggle switches. The coils all have a positive 12v common. I am ...
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2 votes
0 answers
161 views

Feedback on Crystal layout & signal routing for SPI /CAN

Crystal:NX5032GA 16Mhz i havnt had the experience in laying out crystals, im personally using https://www.st.com/resource/en/application_note/cd00221665-oscillator-design-guide-for-stm8afals-stm32-...
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2 votes
0 answers
87 views

How to correctly interpret relay schematics

I am copying a schematic in EAGLE to make a battery protection board (https://www.homemade-circuits.com/battery-over-discharge-protection/) I am very unexperienced in writing relays in schematics, and ...
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2 votes
0 answers
392 views

Multi-layer Via-in-pad with 0.5mm Pitch BGA in KiCad

I am working on a 4 layer board with an 81 pin 0.5mm pitch BGA which effectively requires via-in-pad for dropping down to other layers. Decoupling must be done on the bottom as there is no space for ...
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2 votes
0 answers
65 views

Far field simulation results

I am trying to study the radiated and conducted EMI fields of my PCB using ANSYS SIwave. I did the DC IR drop analysis, and that was okay. Next I did the "Compute Near-field" and "...
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  • 151
2 votes
0 answers
68 views

Need feedback for a PCB design (digital/analog synth)

Ok so I'm designing a synth using the NES sound chip (AY-3-8910). After poorly designing a PCB for it and testing it, I realized there is noise from the MIDI input bleeding to the audio output. I read ...
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2 votes
0 answers
48 views

What happens if the Ground plane is expanded/poured in the VCC/Power layer in the multilayered PCB design? Is that recommended?

I just wanted to know what are the advantage and disadvantage expanding the ground plane in the VCC/power plane in the multi layered PCB. Below is the 10 layered PCB stackup:- TOP, Gnd, Sig 1, Sig 2, ...
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2 votes
0 answers
38 views

Adding Line Out / Sub Out to LG soundbar

I have LG Soundbar with wireless sub. I am trying to add Line output, so i could connect a wired sub. I took some pictures of the boards and chips. If someone could point me in right direction on ...
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2 votes
2 answers
349 views

Altium Designer - Net has only one pin | Pin out of grid | Floating Label | Diferential Pair

I would like to ask a few questions about designing PCB boards on Altium Designer. I am currently designing a STM32 board, but having a few issues with the schematic design. Upon reading some post ...
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2 votes
3 answers
321 views

How do I jump from trace here?

I've been asked to reattach the positive cable that got ripped with the pad from a board given that I own a soldering iron. It seems simple enough to just jump it from a trace. Scraped a bit of the ...
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  • 21
2 votes
1 answer
125 views

Modify PCB Mains Voltage input to 12VDC

One of my amplifiers has died so I need to find out if I can hookup a spare I have lying around as per "Section B" of the below block diagram. I have done the same modification before on ...
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  • 21
2 votes
0 answers
168 views

STM32F103 random reboots

we have made a 2 layer board for a STM32f103, and apparently it works fine but we get a random resets now and then. When that occurs there is a 1 in the Bit 27 PORRSTF: POR/PDR reset flag and Bit 26 ...
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2 votes
1 answer
399 views

Stripline (with target impedance) between ground and power planes?

The common idea for a stripline is that the trace is sandwiched between two ground planes. My question: is it the same, for the purpose of characteristic impedance, to have a ground plane or a power (...
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  • 1,886
2 votes
1 answer
337 views

Single schematic split to multiple PCB in Altium?

I'm wondering if it is possible to have a single schematic that can create multiple PCBs. I'm aware of the multi board capability, however this seems to use multiple schematics to create the ...
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  • 21
2 votes
0 answers
85 views

PCB trace impedance

I have designed a GCPW trace with an impedance of 50 ohms (for a 5GHz application.) The trace is laid on a PCB with the dielectric as FR4 material. I terminated one end of the trace with 50 ohms and ...
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