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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
56 views

Why am I getting 10V at the opamp output instead of 0v?

I have a design that it is based on the CAMPBELL (MAXREFDES4#): 16-BIT HIGH-ACCURACY 4-20MA INPUT ISOLATED ANALOG FRONT END (AFE) reference design from Maxim. This is how the original looks like: And ...
0
votes
1answer
52 views

Crossing ground planes with low current low frequency signals

I have a board which has two ground planes, analog and digital, that on this board are completely separate. The grounds connect on another board, which is connected via a flat cable. All signals on ...
0
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2answers
41 views

Appearing voltage when connecting different grounds

We have designed instrumentation equipment. When several instrumentation units are connected their grounds must be connected. The first proposal was to connect the GNDs by cascade topology. But we ...
0
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0answers
85 views

Why does my IR receiver PCB only work when I touch the sensor pins?

I have designed a PCB based on a schematic which I am pretty sure that is correct and I have tested the schematic several times on the breadboards and all of them worked properly. But, after I ...
0
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1answer
51 views

PCB 6-layer stackup trace reference

I am designing a 6-layer board, with stackup like this: 1-TOP slow North/South 2-GND 3-Signal high speed East/West 4-Signal high speed North/South 5-VDD 6-Bottom slow East/West PCB plane spacing is: ...
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0answers
29 views

Split Ground plane with motor drivers

This is a PCB with few stepper drivers. I have a question about the ground plane. I have this idea to split the ground plane for each driver, so, I force the return path to pass through the capacitor....
2
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0answers
57 views

Surface Mount Springs, how are they called?

We are currently in the process of creating Hardware-Test-Boards where we want to "plug-in" our PCB's and do a couple of tests. Our Boards have a rather complicated shape and are mostly surface ...
0
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1answer
47 views

Vias not connected to ground plane

I recently designed my first 2 PCBs. Both have a 5v copper plane on the top layer and a ground plane on the bottom layer. I use short traces and vias to connect top components to the ground plane. ...
3
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3answers
130 views

How to provide version numbers to hardware schematics / PCBs?

I have one hardware design developed for a customer. We are also selling the same for some more customers with small modifications I would like to know how to provide version numbers for these ...
0
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1answer
36 views

What are the optimal methods for controlling specific header pins via Micro-USB?

Besides buying a Raspberry Pi with GPIO, what is involved in creating a circuit board that can send data to specific pins through a micro-USB cable, as well as read from data from sensors? I am open ...
13
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1answer
936 views

Legal obligations when designing electronics

I'm planning on releasing a USB powered device, basically a AVR ATMega2560 µC with a FTDI FT232RL chip powered by USB-C. Although I'm comfortable with the safety of the device (has fuses, ferrite ...
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0answers
14 views

Eagle: duplicate and edit part

I have a latch relay (hfd2/005-m-l2-d), datasheet: http://www.hongfa.com/pro/pdf/HFD2_en.pdf I want design a PCB. I did not find an Eagle library, so I used this: https://www.diymodules.org/eagle-...
1
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1answer
33 views

Altium 18 - Pad on board edge in 3D-VIEW/3D-PDF

Is there a way to show a half cut plated-hole/pad in 3D-VIEW/3D-PDF on the PCB edge with the board-outline?
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1answer
47 views

Where to find parameters of a component in Altium Designer [closed]

Where can I find the parameters of a selected component in the schematic editor?
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0answers
53 views

A simple idea of how to use microprocessors to record videos? [closed]

I work on a project with my friends for colleague , we want to create a unit that can record video and audio and save it to storage unit - we will use sdcard - so when friend come to my home and did ...
2
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1answer
113 views

Grounding and Signal Integrity of my PCB Layout (ADC, SMPS, SD card, USB)

I am currently designing a battery monitoring system for an 8 cell lithium battery pack. I originally made the device using a STM32 dev board and breadboard, with an SD card to log data. The system ...
1
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1answer
36 views

ISA Card Mechanical Drawing Source

I'm designing a new ISA form factor PC board for a legacy system. I've looked around the net and found several references for ISA board dimensions, but they don't call out the location of the edge ...
0
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4answers
58 views

Can a PCB circuit have through hole components on both sides of the board

I'm making a temperature sensor ciruit on a 1×1 inch PCB and needed to put some components on the other side to fit everything. All the components are through ole. Is this feasible, I was able to ...
1
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1answer
40 views

How to power STM8(S105C4) chip? Is decoupling needed?

I have a MCU STM8(S105C4) with which I need to design a PCB to power from a USB. But I don't know how to power it. I've tried searching the specification for this MCU but all that I could find is that ...
0
votes
1answer
85 views

Attaching a decoupling capacitor to PCB. What should go where?

I'm nearly finished with the recreation of a PCB that'll be used in creating a modchip for my PlayStation 1 that is gathering dust. I'm basing it off a modchip I bought last year but accidentally ...
17
votes
4answers
4k views

Why are there so many vias on this board?

I was looking at the MMZ09312BT1 development board layout, and I was curious about all the holes they have on the board. Are these vias? What is their purpose (I heard somewhere that they are meant as ...
0
votes
1answer
41 views

Crystal 4 Pins SMD footprint

I'm designing PCB that includes 24MHz SMD 4 pins crystal. According to my understanding, the crystal package marking is for Pin number 4. I wonder, how should I indicate in the PCB this pin? Should ...
0
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2answers
117 views

Too many vias on ground trace

I've got the following layout for 4 layers PCB, I would like to know why there are so many vias on the ground trace.
1
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1answer
42 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 ...
0
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2answers
122 views

PCB Reverse engineering in ALTIUM

I have to redo a schematic for a PCB. I have a paper version of the schematic, the Gerber file of the PCB and the PCB in a CADSTAR project but not the schematic. I'm using Altium and wanted to know if ...
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0answers
22 views

Appropriate PCB Stack Up for Transimpedance Circuit

I'm designing a circuit involving multiple silicon photomultipliers that involves the necessity of multiple layers for my circuit. My circuit is shown below: simulate this circuit – Schematic ...
0
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0answers
23 views

Does orientation of SiPMs matter?

I'm designing an SiPM array using the SensL MicroFJ-60035 TSV. It's a BGA SiPM with its pads in a 6mm by 6mm square layout. Here's a link to the product description below as well as a document showing ...
0
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0answers
4 views

Are ttp229 touch channels working independently?

I am designing a PCB capacitive touchpad by using ttp229 IC. The question is if channels in this IC are working independently so that it can be used in Slide button? There is some explanation in the ...
0
votes
1answer
112 views

Vias in between BGA Pads

I'm designing a 4-layer board with BGA components. The BGA part I'm working with, the SensL MicroFJ-60035 TSV, is a BGA SiPM with its pads in a 6mm by 6mm square layout. Most of the pads are no-...
1
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2answers
112 views

Trouble with PCB design for USB3 connections

I'm struggling with making a USB3 connection work. The PCB needs two USB3-A female receptacle, to play sort of a "man-in-the-middle" role. I cannot provide much detail, since it is part of an ...
0
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2answers
67 views

In PCB DFM process; manufacturer have highlighted Gullwing Issue. What is Gullwing?

In PCB DFM process; manufacturer have highlighted Gullwing issue saying "Gullwing is not optimal robust SMT process. What is "Gullwing"?
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0answers
36 views

How to convert MIPI DSI to Parallel RGB888 [duplicate]

I am using the Qualcomm Snapdragon 410E and want to interface a parallel RGB888 display to it (24 bit parallel interface). The Snapdragon only has a MIPI DSI interface, so I need to find some way to ...
0
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3answers
40 views

Equivalent Characteristic Impedance for Different Trace Widths

Suppose I have a PCB trace that needs to be impedance matched, but the trace width changes as it travels from its source to its destination. Something like this: The 5mil trace would have a certain ...
0
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2answers
33 views

How do eradicate pad to pad clearance with-in the component in Eagle Tool?

I tried clearing the error by defining Rules and net Class, but that does not happen. How to do this?
1
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1answer
39 views

Voltage sequencing on power up

I'm pretty new on PCB design, so my question may be obvious for some of you. I am wiring the layout of an LCD screen on a PCB using kicad, when I came to powering up, the datasheet of the AT070TN92 (...
0
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2answers
38 views

In 4 Layer PCB - which internal layer has to be consider to calculate Microstrip characteristic Independence for bottom layer

4-layer PCB stack-up as shown in attached figure - In case of bottom layer; which internal layer has to be considered to calculate characteristic impedance for microstrip line on that layer. Is it ...
0
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0answers
25 views

Where do I find free PCB designer programs? [migrated]

I'm a huge video game fan, and I'm looking to recreate the TurboGrafX myself, from gate level. My issue is that I can't find a free PCB program online, anywhere. Is there something professional I can ...
0
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3answers
37 views

Altium: multiple component footprints for the same component on the PCB

The question is one, but revolves about: component definition in the library placement between the schematic and the PCB document so that they remain synced proper Net definitions and avoid errors ...
2
votes
1answer
94 views

Missing soldermask on some pads of mcu

After designing a board in Kicad with an SMT32L0 on it, I sent it to seeedStudio and when I received it, I noticed that some of the pads on the stm32 are missing soldermask: I checked the gerber file ...
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0answers
33 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....
1
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1answer
50 views

Reference Plane In Impedance Calculation

I'm designing an 8-layer PCB with 10 distinct region of power. To attain 50Ohm trace I used Stripline calculators (like this fancy EEWeb) and they work great If you know that you have a complete solid ...
0
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0answers
33 views

Is there anyway to convert .bac circuit schematic into a .pcb extension?

I'm using the pcb layout software, which is kind of a Diptrace plugin, and I created my pcb layout and wanted to export it with a .pcb but I couldnt do that, it just exports it as .bac file (I assume ...
1
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1answer
59 views

Altium 17 hatched polygon problem

I'm currently designing a PCB and I need to use hatched polygons in order to get my PCB produced (my manufacturer accepts only hatched polygons). The problem is the following: in only one of the ...
1
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2answers
36 views

SPI, RS232 and DMX-512 data signals beneath the ESP8266-WROOM-02 Wifi antenna

I am working on DMX-512 Controller, which will accept commands for driving Addressable LED strip (GE60RGBW8812A) via ESP-WROOM-02 Wifi Controller and I have several data lines (...
0
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1answer
53 views

How do I learn-by-practicing digital circuits - MIPS R2000 (or similar) processor or board? [closed]

I already do have a book which I am studying for a university course. I've searched online to buy a development kit for MIPS R2000 (or similar) and have been suggested the MIPS CI20. Don't know if or ...
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1answer
26 views

EAGLE GERBER files nit opening in CAM 350

I have chinese factory that I need to assemble PCB. They cannot open eagle gerber files, only altium how to fix
3
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2answers
55 views

Why voltage source has been connected via inductor at the output of LNA?

I have been reviewing the schematics of LoRaWAN Gateway designed by Microchip (Page 48). The output of the LNA has been connected to voltage source via inductor. ...
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votes
1answer
114 views

Clock oscillator pin, requirement, ac-decoupling and termination

I'm trying to make something with ADI PLL (ADF4159 and ADF5901). In their datasheet there is nothing about how to source the clock pin. I have found lots of information about clocks on the internet ...
11
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2answers
187 views

Do chips really need multiple values of decoupling capacitor in the same packages?

A similar question is asked here: "two bypass/decoupling capacitors" rule? But that question was about parallel bypass capacitors without mentioning package size (but the answers mostly ...
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votes
1answer
64 views

How to draw the stripboard planning for this diagram [closed]

Can anyone help? I have no idea how to draw stripboard planning diagram for this diagram. I have to solder but I cant even start without stripboard planning diagram. Thanks in advance.(https://i.stack....