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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.

0
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3answers
33 views

Can Altium Designer 17 Generate Missing Paste Mask Layers?

I recently ordered three proto PCBs from a small PCB company. This board house produces Gerber files in-house from their proprietary PCB layout files, and provides this Gerber set to the user 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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1answer
66 views

Effects of Neodymium magnets on PCB

I'm currently doing a project that consists of: Arduino Nano. Battery. Buck Boost converter. GPS module. TSL2561 light sensor. BH1750FVI light sensors. LSM6DS3 Accelerometer. HDC1080. MicroSD shield ...
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 ...
-4
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0answers
45 views

how can I design a 2-bit adder-subtractor circuit? [on hold]

how can I design a 2-bit adder-subtractor circuit? can you draw the truth table for it? please don't use full-adders(draw the full-adder in detail) please help me I need it badly...
0
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1answer
48 views

Splitting an Analog Signal Without Adding Noise

I am trying to take a current measurement, run it into a PCB that splits the signal, and then output the signal in two places. One of the destinations is a RIO being used for feedback control, the ...
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 ...
-5
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0answers
38 views

How about this project?Also how can i do it?Is it belongs to PCB field? [closed]

https://www.hackster.io/xreef/attiny-programmer-board-arduino-uno-as-isp-8b83f9 if i wanna do this project,what kind of pcb that i need to get a offer? Anyway,i can get a new pcb?
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0answers
66 views

Rubber Feet Melting Syndrome [on hold]

I'm sure many of us have encountered old pieces of equipment, picked them up, and exclaimed in disgust as we discover that their rubber feet have melted into a nasty, sticky goo. My understanding is ...
0
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1answer
35 views

Tablet battery dead, 5v directly to pcb? [closed]

I have a tablet with Dead battery. Since I cannot buy new battery in near future, it cross my mind to connect battery bank directly to pcb (solder output from battery bank to battery connectors on PCB)...
1
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1answer
44 views

How to connect a CR2012 coin cell battery with a PCB?

Im trying to build a flat, battery powered PCB assembly that fits into a small gap of approx. 2mm. I have found the CR2012 coin cell with a thickness of 1.2mm, which would be a good fit in terms of ...
1
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0answers
23 views

Broke link between sch and board

Eagle 9.2.2.standard software Windows 10 64 bit Somehow I broke the link between the .sch and .brd files. Now I get the error "Board and schematic are not consistent!...." I spent a lot of time with ...
1
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0answers
70 views

How long to layout a double-sided PCB? [closed]

I have a "moderate" complexity, double-sided PCB. Mixed signal, microcontroller board. 173 through-hole components, 530 pins, board is about 8" x 4". It has taken me at least 2 weeks to get to a ...
9
votes
3answers
956 views

PCB enclosure tolerances [on hold]

I can imagine problems of PCBs not fitting into their enclosures or misaligned screw/hole pairs. Are these type of problems common, especially with the dirt cheap enclosures? I am planning to use one ...
1
vote
1answer
49 views

H-Bridge Adjustable Slew Rate: Why is a decoupling capacitor needed?

I am designing a simple 3-phase inverter for BLDC Motor control. For that purpose, i plan to use a IFX007T from Infineon. The slew rate is controlled via a resistance connected in series to SR pin. ...
0
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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 ...
0
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1answer
39 views

KiCad pad clearance problem

I set up a clearance of 0.256 mm, however, this distance is only applied between the ground and traces. When it comes to ground and pads, this distance is small. I am wondering will be the copper ...
2
votes
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
vote
1answer
98 views

What kind of part is this?

What kind of part on the board below? Or it's a part of another part?
0
votes
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 ...
0
votes
1answer
44 views

Change PCB-mounted switch

I have this Bi-Direction Switch: (Image source - front of switch) (Image source - back of switch) I want to change the Button/Switch (I don't know the exact English word) to this one, for style ...
1
vote
1answer
76 views

Help identifying 6 pin block from PCB

This is from a JVC TD R272 tape deck. A ribbon cable from the head to the board goes into it. I snapped it due to impatience. Can someone tell me the name of the white plastic block? It has six pins ...
0
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1answer
37 views

Is it bad practice to place a LiPoly battery underneath a PCB in an electronic device?

I'm designing an electronic device and have considered placing the plcb on top of the battery within the device to minimize space used. My gut tells me this is unwise however. What concerns are there ...
0
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1answer
61 views

Good PCB Design - Single Power Plane with 2 Power supplies (+ve & -ve)

Recently I've taken over a project which requires low noise but the design given to myself does not meet the requirements. I noticed on the PCB design It has a single Power Plane with 2 separate ...
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.
0
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1answer
52 views

Is it acceptable to split one wide wire into two narrower wires in PCB layout?

I have an issue about connecting power wire to the IC. The power wire (50mil) is wide than the pin width of destination IC, so I want to split the wide wire into two narrower ones(20mil) which match ...
1
vote
2answers
95 views

Advice for 25-50 Mbit SPI lines - PCB design

I would like to ask some advice for my layout design. I am working on a layout design. The designed PCB will be a Beaglebone Black (BBB) extension card. It is a four layer PCB with the following ...
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 ...
2
votes
0answers
65 views

Can Silkscreen Go Directly Onto Copper PCB Layer? (No SolderMask)

Hi I am wondering if a PCB silkscreen layer can be printed directly onto a copper layer without a solder mask. I don't see this often but I have a design for which this would be useful. Has anyone ...
0
votes
1answer
51 views

Does LVDS always need 100 ohm differential impedance?

LVDS pairs need 100 ohms differential impedance. However, I am having trouble achieving that in my design. My design requires that the pairs travel over very thin flexible PCB, about 50mm total ...
3
votes
4answers
1k views

What are these exposed copper rectangles for on the mbed NXP LPC1768?

Today I noticed some exposed copper rectangles on the bottom of an mbed NXP LPC1768 dev board. They don't look like they're meant for components. I think they may just be test points, but I'm curious ...
-1
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0answers
55 views

Place component in Altium automatically for minimizing losses on traces

Is there a way to place a number of components in a PCB room, in a way so that the overall distance of the connections (and thus the losses in the traces) will be minimized? Thanks.
7
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3answers
3k views

What is this small unconnected solder blob on this PCB?

There's a small solder blob in the middle of this one-sided PCB (a switch-mode power supply), surrounded by unmasked board. The blob is 1.5mm in diameter, and the non-masked area is 4mm in diameter. ...
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"?
0
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1answer
49 views

In PCB DFM analysis; manufacturer highlighted TOEPRINT ISSUE. What is component TOEPRINT?

PCB manufacturer have highlighted component TOEPRINT issue. Issue Statement: "Component is too close to another component TOEPRINT." What is mean by TOEPRINT?
-3
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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
61 views

PCB Trace length vs Impedance

There are a lot of PCB trance impedance calculation tool available on internet, for example : http://www.eeweb.com/toolbox/microstrip-impedance Trace impedance can be calculated by entering ...
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 ...
11
votes
2answers
2k views

What is a mask on a PCB?

I have an Arduino project that is mostly working on a solderless breadboard and I’m starting to plan on making it semi-permanent by soldering the components in place and mounting it into a project box....
0
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2answers
31 views

reflow oven issues with RO4003 PCB

Im trying to reflow some RF pcbs in a legit reflow oven. The PCBs material is "Rogers RO4003 305 Um" and 3 layer. (Its a very thin pcb) If temperature is high enough to reflow the paste, the pcb ...
0
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0answers
23 views

Repairing damaged battery pad

Trying to fix up this PCB -- One of the batteries leaked and corroded a hole in one of the battery pads. I tried to fix it a while ago with some electrical paint, but it did nothing. I remember ...
0
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1answer
42 views

Supplying power to PCB with USB voltage (2.5V) regulator [closed]

I am designing a normal PCB board. I want to put a USB voltage regulator to supply my PCB. I don't need to design the voltage regulator. I just want to add it to supply voltage in my PCB circuit. The ...
0
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1answer
36 views

Cosimulation Error on Advanced Design System

I want to use BLF2425M9LS140, Power LDMOS transistor, to do cosimulation on ADS. I have got transistor's PCB design from its site and have done required procedure but when I try to convert layout to ...
2
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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 ...
0
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1answer
77 views

Worthwhile to create some 'building block' PCB instead of handsoldering?

I am still busy with my DMX splitter. The circuit is (at least for me as beginner) quite exhausting to hand-solder. See circuit below (sorry for my 'artwork' as some used to call it, it benefits me a ...
0
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1answer
52 views

Two capacitors of same value connected in series and connected to power supply instead of one capacitor of equivalent value for PCB design

what's the purpose of two capacitors of same value connected in series and connected to power supply instead of one capacitor of equivalent value for PCB design especially for Automotive applications
0
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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....