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

learn more… | top users | synonyms (2)

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2answers
20 views

Bottomless SIP Socket/Machine Pin Header?

I'm working on a personal PCB design project where I need to be able to remove a component easily (to swap out, etc). The component has two rows of 8 pins (standard 0.1" pitch). At first, I designed ...
0
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2answers
63 views

smd resistor and regular through hole resistor

My question is fairly simple. I am building an SMD LED board and i am limited in space. So originally i was planning on going with through hole resistors, but have it being i'm very limited on space ...
0
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2answers
82 views

Why do circuit boards use strange paths? [duplicate]

First, let me say that I'm no electrical engineer, I'm just a curious student. Here's a photo of a Raspberry Pi A+. I (as one completely ignorant of PCB design) would expect the electrical paths ...
2
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1answer
45 views

From what pitch should I consider ENIG finish

My design (4-layer, FR4, 1.6mm) has a couple of ICs with 0.5mm pitch pads and some LEDs with 0.4mm pitch pads, very small LEDs. Should I consider ENIG (more expensive) or will HASL do the job? I read ...
0
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1answer
47 views

What happens to the output of Optocoupler input voltage is negative

Here is an example of circuit using VIshay Optocoupler 4N25 5V to 3.3V GPIO Output (Inverted) Logic +5V Input ---> 0.0V output GPIO LOW +0V Input ---> 3.3V output GPIO High What happens to ...
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2answers
36 views

PCB coil electromagnet driver

Based on external sensor inputs, I want to vertically pulldown & release (in a controlled manner) a 7mm neodymium magnet enclosed inside a circular elastic diaphragm. I want to keep the size as ...
1
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2answers
101 views

Designing PCB with Multiple power supplies

This is my first REAL project and i need some help. I'm working on a project where I am trying to design a PCB for controlling the environment inside an enclosed cabinet to grow a tomato plant using ...
0
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2answers
46 views

What is the most physically robust USB connector for PCB?

Of the different types of USB connector that can be fitted to a PCB, which is the most physically robust type?
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0answers
41 views

What good pcb manufacturers do you know that can also assemble smt components? [closed]

I don't know if this is the right board to ask this but since it's electronics related i think it fits. I need to find a good pcb manufacturer that can make withing a reasonable price small to medium ...
1
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0answers
24 views

Circuitry for the DRV8840 Motor Driver

I'm building a circuit based on the DRV8840 (datasheet: http://www.ti.com/lit/ds/symlink/drv8840.pdf). Unfortunately, I can't get it to work. I think something might be wrong with my design. When I ...
0
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2answers
60 views

Eagle PCB design issue

I have finished the schematic layout for my design which contains transformer. I also found the optimized design 100%, but the transformer background should be black while I'm having only portion of ...
2
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3answers
188 views

PCB, Plated hole with annular ring on only one side

I need my pads for connectors to be plated so that the pins from the connectors can be soldered. But the bottom side cannot have copper pad/annular ring. I have made the pads as shown in the figure ...
1
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0answers
21 views

BOM/OPL parts help before PCB fab

I am completing my first official PCB project. I am outsourcing the PCB fab to Seeeed Studio. I was wondering if any of you might be able to shed some light on my issue. I am using their PCB ...
4
votes
2answers
256 views

Scoring a PCB across traces

I'm wondering if it's possible to score a PCB (such that I can easily break off the scored section) while still being able to have traces going across where the score would be. I have a rectangular ...
0
votes
1answer
32 views

What does 4*1 Panel-up mean?

I believe the number 4 corresponds to the number of individual PCBs and the number 1 is for one panel. Is this the way panelized PCBs are commonly referenced? With an asterisk mark? What does the ...
0
votes
1answer
101 views

Why PNP transistor might be opened even though (almost) nothing is connected to the base?

I have a simple printed circuit board with simple circuit on it. Very beginner. No SMD. As a part of this circuit I have transistor BC557. If I don't solder the base pin of this transistor and test ...
3
votes
4answers
118 views

Routing USB2 signals

On this board USB2 signals are routed using smooth lines instead of the usual 45° routing seen on the rest of the board. Does this offer advantages or is this even necessary? A theoretical advantage ...
0
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0answers
11 views

How to move multiple symbols in Allegro?

Can I select multiple symbols in Allegro and drag them? They are all on the top layer and I just need to move them to make space for another component.
1
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1answer
23 views

Is it possible to edit gerber file using allegro?

I want make some corrections in gerber file. Is it possible using allegro? Or is any other better method to do it?
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2answers
62 views

PCB design for automotive fusebox?

I am currently in the process of designing an automotive (motorsport related) fuse-box as a side project to my studies. I've not had much luck searching for fuse holders (20 position) however while ...
4
votes
2answers
58 views

Creating an Integrated Circuit Component in Altium

I am new to PCB designing and I am new to Altium. I want to make a schematic, PCB design and simulate a RF circuit involving a GPS receiver front end IC MAX2769. Altium library does not have this IC. ...
0
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2answers
109 views

9 Amps on Ethernet?

I already did my search but I found nothing to confirm it. I have a PCB and I want to connect a jumper that can carry up to 9 Amps. I tried a zero ohm resistance but it melted so I want to use an ...
0
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2answers
62 views

Tools used to manufacture entire digital systems

I am new to electronics and am trying to wrap my head around the various tools used for producing various digital components. My understanding of HDL languages like VHDL and Verilog is that they ...
9
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5answers
1k views

Anything bad to place a via on a pad?

Once I mistakenly placed a via on 0603 pad and didn't have any problem on soldering. I am routing another board now and I could save some space by placing some vias (0.3mm) on a 0603 pad. I wonder if ...
1
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5answers
81 views

Through Hole Soldering- Minimum lead protrusion

I am working on a bit of a strange design: all components, SMD and Through-Hole, are mounted on the top side of the PCB, except for some really beefy MOSFETs, which are mounted to the bottom side of ...
0
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0answers
36 views

Problem with integrating Intel Edison

I have been working on developing a device that combines a cellular modem and the Intel Edison. The modem sends and receives data over the network while the Edison takes that data and interprets said ...
8
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7answers
2k views

How come product makers tend to make their own boards rather than putting together modules?

It seems that most, if not all, companies that produce mass market goods use custom boards rather than putting together modules that are already available in the general market. For instance, battery ...
0
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1answer
59 views

Changing potentiometer from a gaming steering wheel

I have Logitech's vibration feedback wheel which has a rotation of 270 degrees. I am considering changing its potentiometer so it can rotate more (900 degrees or 1000 degrees maybe). What ...
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2answers
73 views

Perpendicular tracks in 2 different layers (PCB)

Many times ago I heard it's not good to have 2 perpendicular track in 2 different layers of 2 layers PCBs(I mean one track in one side become perpendicular to another track in other side of the pcb) . ...
0
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1answer
37 views

Basic NFC Loop Design on PCB

I'm a college student learning the basics of NFC loop antenna design. As a starting point, I'm trying to design a PCB-based rectangular NFC loop operating at 13.56 MHz, matched to 50Ω. (NFC ...
0
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1answer
29 views

Low Output from MIC5205 LDO Reg

I have a PCB that's designed to output 3.3V from a 5V source. The 5V source I'm currently using sources several amps (3A), though I only need about 100mA. I based the schematic on "Ultra-Low-Noise ...
0
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0answers
48 views

Thermal Reliefs (pads) visible at the gerber files, but not milled to the PCB board

I have problems with the thermal reliefs. I design a PCB board with two layers at Orcad's PCB editor and it looks perfectly fine as in the picture I create then the Gerber files and the thermal ...
0
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2answers
57 views

Unexpected drill hole behind voltage regulator in EAGLE

I am designing a PCB in EAGLE and I want to use an 7815 TO-220 voltage regulator. When I check the top or bottom layer mask of my PCB I can see that there is a hole (with no copper I think) behind the ...
6
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4answers
955 views

Is it safe to clean contacts with an eraser?

Today, while I was cleaning a RAM module, I was thinking about this. An eraser is really a easy way to clean gold/copper contacts in such modules. And it is really tempting to do so. I did it a few ...
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0answers
41 views

pcb trace current limitations

i did try some calculators but some of them is complicated and i've got lost i've a width of about 2mm and depth of 1-3mm, how much current could they handle ? what if i feed them more current ...
8
votes
5answers
2k views

Hack for fitting 0.04“ leads in to a 0.025” hole on PCB

This might be a ridiculous question to ask - but I have made a mistake in a new library I created in Eagle for a component. The drill diameter of the plated holes for the component leads should have ...
1
vote
1answer
40 views

Altium Connections

In Altium, does a multilayer Pad with the same net as a plane (internal ground plane in this case) automatically connect to that plane, or is a separate via required?
0
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1answer
61 views

Sharing ground and power across circuits

I'm just beginning with circuits, so pardon if this is elementary, but I couldn't figure it out. I'm building a speaker joining several circuit boards together: a trinket pro a class d amp an FM ...
2
votes
3answers
152 views

'Unrouting' a ground plane on Eagle

I have been using Eagle for quite a while now but there is one thing that continues to bother me while I am using it. I have made the ground plane cover the shape of the board, however, when I am ...
0
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0answers
50 views

Is it compulsory to pass PCB through Reflow after wave soldering?

Is it compulsory to pass PCB through Reflow after wave soldering ?
1
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1answer
31 views

Running a 4-DC motor Circuit

Currently I'm doing a project where I am simply trying to get a robot to move forward without code by using say a push button or a potentiometer. I plan on moving on to micro controller later, but ...
3
votes
2answers
49 views

Restrict area trouble in Eagle

I am trying to get a small section of my PCB design to be ground-free as this is the advised layout given by the manufacturer of the component. However, I believe that because there are components ...
0
votes
1answer
21 views

How to recalculate connections/airwires from copied traces?

I am learning how to use Eagle, and am designing a breakout board. After routing the connections for the top of the IC, I duplicated and mirrored them for the bottom connections. How do I make Eagle ...
3
votes
1answer
64 views

Multiple SPI Busses in Ribbon Cable

I have a multiple SPI busses running through a ribbon cable which is 15cm long. What is the best CS, SCK, MOSI, MISO orientation to avoid the cross talk between each wire and is it enough to use ...
0
votes
1answer
51 views

KiCad Multiple power inputs

I'm working on a project in KiCad. I have a connector that has multiple connections for GND, +5V, and +12V (all set to type: Power Output) in order to increase the maximum current. However, I don't ...
16
votes
6answers
2k views

New to PCB design - why doesn't auto placing components exist?

The circuit design software I have seen has the ability to automatically route traces etc. on a PCB. But why doesn't this software have the ability to automatically place components on a PCB say to ...
0
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0answers
57 views

PCB Power grid trace

I am currently working on my PCB layout and having trouble laying the power traces. I am trying to avoid running any tracks under signal traces and keeping power somewhat separate. I tried doing ...
1
vote
1answer
42 views

Kicad plotting/printing

I made a really simple scheme/pcb using Kicad (on Ubuntu 14.04). Now I'd like to print this and make my PCB, but I can't figure out how to properly plot the damn thing! When I plot using gerber ...
0
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1answer
45 views

what does this symboles means Unm, Uni?

I found in some documents that the creepage and the clearance distance for PCB are calculated according to the value of the tensions Unm and Uni. What does this symboles means ?
1
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2answers
318 views

Designing a high-power PCB

I'm trying to build a Raspberry Pi cluster (at least 32 Pi's) and I need a convenient way to power them all. So I'd like to design a power distribution board. The distribution board will have USB ...