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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How to get the value of a burned resistor on a PCB of Weanas® Plug Power Meter? [on hold]

In my house electricity was shut down and came up again a several times during 5 seconds. After that my device - Power meter did not work. It was possible to turn on the device, but it was showing ...
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1answer
39 views

Add male pin headers in DesignSpark PCB [on hold]

I've been struggling with this software to find male pin header connectors but I could not find it even on the online database, has anyone an idea ? Thanks!
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1answer
76 views

Spark Core Shield PCB design review

I'm designing a PCB (a shield for Spark Core - microcontroller + wifi board). It is connected to 5 analog sensors (not on board, using 3pin header) and 4 relays (on board). Output(RJ45) and vias on ...
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4answers
178 views

Trace width and spacing

I'm designing a PCB board (low current, low frequency) mainly consisting of low frequency SPI and analog sensors. Are wider traces better or does it not matter? And which is better, consistent trace ...
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3answers
123 views

What is the component in bluetooth module

Last month, I bought a bluetooth audio module on eBay. And I wonder what components are on this PCB. In the picture, what is the component in the top red box? What is the component in the bottom red ...
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4answers
126 views

High precision soldering of through hole components

I have a through hole component with many leads spaced closely together, see picture: I'm looking to unsolder it from the PCB and then solder it back again. Unfortunately, the leads are spaced so ...
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3answers
88 views

Solder Mask and Pad Area (SMD vs NSMD)

I have been trying to figure out the "right" way to size pads for surface mount components, and I have found some conflicting wisdom floating around the internets. Lets say I have this hypothetical ...
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3answers
3k views

What are those small metal bars going across a PCB for?

In quite a lot of PCBs that I have seen, they often have these small metal bars going across from one point to another. Here is an image of what I am talking about. In this example it is a charger: ...
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2answers
34 views

Eagle cad replace command using command line

I am using Eagle Cad and changed my libraries to another folder. I needed quicker access. Now I have to update my components in my schematic and wanted to use the replace command from the command ...
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3answers
90 views

What kind of equipment would I need to apply nonpermanent extension wires to test points of a PCB so I can access them via a microcontroller?

This is a DIY project. The title question is the first problem I'm considering, but the entire project is the goal I'm not an expert in hardware, but neither am I uninitiated. Put me at around an ...
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2answers
80 views

Re-reflowing a populated PCB

I've printed, populated and baked a test PCB with most components that I needed. I left off a GPS chip and associated passives because the GPS chip itself costs more than the rest of the board, and ...
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3answers
92 views

Connect USB to microprocessor lacking a output port?

Sorry I'm sure this is a very simple answer but I know very little about how it works beyond serial ports and USB adapters for interacting with PCB circuits. I've taken apart an old junk flip ...
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2answers
49 views

How to deal with devices connected via a connectors in schematics?

I have a few sensors (potoresistor, temp sensor...) that connect to the board indirectly. The PCB will have a connector such as the molex 4pin fan connector that will in turn connect to the ...
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3answers
131 views

Is electronics an expensive hobby? [closed]

I recently just finished my Eagle schematic for a simple robot that moves and plan to order the parts and the PCB soon. Unfortunately with the soldering iron, helping hands, lights, solder, parts, and ...
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2answers
1k views

What is the use of the golden like coat on this circuit?

The below PCB belongs to a wireless access point. Could anyone explain what are the golden-like part of the circuit that is indicated by the red circles(ish)? What material is it? What is the the ...
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2answers
55 views

Ideas for troubleshooting a noise generator on a PCB

I am building an electronic "dice" that uses an ATTiny84 to sample avalanche noise from a 2N2222 in reverse-bias and generate random numbers, which are then displayed on 2 7-segment displays. When I ...
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2answers
28 views

Altium Leaves Board Border Outline on Assembly Notes Layer

No matter what, Altium leaves a border of the board on my cover page when I try to generate an assembly document. I only have two layers: Assembly cover notes and Assembly notes tops. Neither of which ...
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1answer
54 views

What does EMSE mean?

I'm currently trying to use EAGLE software and I'm trying to import a part called 'LT3022' which is a voltage regulator from Linear Technology. I've found a CAD library of LT products from element14 ...
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2answers
58 views

Custom Eagle Part has isolation built-in?

I've just created the footprint for a QFN-56 8mmX8mm to be used with the TLC5958. It seems like there is some sort of isolation built in to the center pad and I cannot figure it out. In the image ...
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1answer
228 views

What are the contact pads near the ATmega32 chip on the Arduino Yun?

What are/What use have these pads near the ATmega chip? I thought they are used for testing or something else, they seems to expose the ATmega traces directly. Maybe they can be useful to connect ...
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2answers
110 views

What's this 't' unit on a PCB?

I recently came across a symbol like this on a PCB: (forgive the use of Paint) The component was marked as being 0.1 (symbol). You can just make it out in the centre of this photo: It's a ...
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1answer
59 views

Vias - drill sizes and pad sizes

Basically, I'm wondering if the size of a via pad and drill has any effect on my circuits. For example, let's look at two vias: One via has a smaller drill and more copper around the edges, while ...
6
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3answers
596 views

What are some tips to routing a one sided PCB?

I'm having trouble routing this PCB in Eagle 7.1: I have tried the following: Autorouting - it could not complete Moving components around Manually routing - I always ended up getting stuck ...
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1answer
27 views

Need some help learning to make my own parts in Eagle

I am extremely new to using Eagle (or creating circuits in general). I've been searching around online for tutorials on making your own parts in eagle. However, I still have a few questions and I was ...
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3answers
46 views

RJ11 socket in Eagle libraries?

I am trying to add RJ11 (telephone wire) sockets to my PCB on Eagle but am having trouble finding it in the libraries. Is this a standard socket that is included or do I need to install some external ...
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2answers
82 views

Lead solder toxicity after cooling?

Now I am sure that most people have read discussions on the possible hazards of handling solder and how your supposed to wash your hands after handling it. My question is, after soldering something, ...
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1answer
59 views

Books on PCB design [duplicate]

Anybody knows a good book on pcb design? I need to learn some theoretical concepts for designing pcb for usb/ethernet application.
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3answers
710 views

What is the purpose of star pcb?

I'm fairly new to electronics, and I was recently looking at some LEDs listed for sale online. Some LEDs were mounted on "star pcb": From the picture, it looks like there are 6 connections. I'm ...
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20 views

Problems with hole.lbr Eagle

I am simply trying to make two holes in a Eagle schematic using holes.lbr to connect two wires to. It appears as though I cannot connect it to any part, I have tried using the net, wire and junction ...
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4answers
239 views

Powering an ATmega328 chip

I am trying to make a printed circuit board for a robot. I would like to make this look as neat as possible, and I would like to have the peripherals like the sensors and other stuff, and the ...
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0answers
21 views

Printing with Gerbview - Respect Track width

I am printing some circuits to a sheet with Gerbview and KiCad. However, the physically printed out tracks are the same width no matter what they are set to or displayed as in PCBnew. Since I am ...
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39 views

Multiple Layers per Page Printed on Altium Designer

I use Altium Designer for PCB design. Usually, before ordering prototypes with a better finish, I make my own boards at home, as many do. I'm playing with the Press-n-Peel sheets for the tonner ...
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0answers
32 views

Choosing a footprint in KiCad?

So, let's say I'm composing a schematic for a circuit I'm designing in KiCad, and... done. I now have to to choose a footprint for my components. How does one ...
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1answer
129 views

Female-female connector, but what is it called?

Question What is the "official" name for this type of connector? (the large black box in the image) More info... I need the connection to connect two PCBs together as one was missing from a system ...
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2answers
143 views

How do I solder “cable shoes” onto a circuit board?

I've got a timer (http://m.ebay.co.uk/itm/221094671882) with male cable shoe connectors (see image). I've connected the timer with other devices using wires w/female cable shoe connectors. Cable ...
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2answers
108 views

When is it theoretically possible to fit PCB circuit on x Layers (emphasis: x =1)

When is it theoretically possible to fit a given circuit on a certain number of layers? (Presumably PCB layers.) What is/are the name of the mathematics/algorithms that might determine this, or ...
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1answer
121 views

Grounding the chassis with capacitor

My question involves chassis grounding to earth ground. My PCB circuit is a simple signal generator using a microcontroller. It has a separate 'ground' from earth ground, supplied by a floating 5VDC ...
4
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2answers
139 views

Creating printed circuit boards (PCBs) which aren't flat

I would like to create a printed circuit board (PCB) which is not flat and which is not shaped into a square, but don't know how to proceed. Can Cadsoft Eagle create such a board? If so, how? What ...
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2answers
52 views

Good method to remove tenting on vias after assembly for debugging?

This is a question about modifying an assembled board to make it easier to debug. In a perfect world, I would have left the bottoms of these vias un-tented. Whoops. I have two BGA parts on a PCB, ...
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1answer
48 views

STM32F102 USB Programming

I am currently designing a board for a STM32F102 chip which needs to be able to use the USB bus to transfer data while the chip is running. However I also want to be able to program the chip through ...
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2answers
162 views

Making PCB with DVD Writer

Maybe sharing this idea after building a prototype would be much better. As many of you know, there is a technique to make a PCB with laser CNC. You spray a matte black paint onto PCB, and burn that ...
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1answer
53 views

What are .C1 and .C2 Gerber files in Altium 14?

I am currently working on a project and I'm about to get the Gerber files checked by FreeDFM.com. My question is, in my Gerber files, there are a couple that have the extension .C1 and .C2. In ...
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39 views

Why is all my photoresist stripping?

I got presensitized positive boards from Injecterall, but I'm using Datak chemicals (positive developer and etchant). I used Datak boards before and the process was very smooth. This time, after ...
6
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8answers
580 views

How do you cover up exposed high voltage pcb traces?

This is my PCB: The thick lines should be able to pass a high voltage (230VAC) signal through it. The board will be kept inside a enclosed box. In my case, the signal on the board is only one ...
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1answer
48 views

Exporting from Altium to CST PCB Studio

Based on CST website, they claim that CST PCB Studio can import Altium files. But when I open Import on CST , it gives me just these options : I tried to Export Altium to HyperLynx and Import it ...
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1answer
90 views

Solder sticks to PCB (not just the pads!)

I'm having a severe problem with solder adhering to the FR4 PCB material. I made my boards (myself, my first time) using positive developer and etchant on a pre-sensitized board. I washed the etchant ...
0
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1answer
63 views

Usart puzzle giving strange output on tx pins

I have tried working out usart peripheral of pic18f26j50 and it found out to be working very well. This one is for a pic18f26j50 in bread board with observing TX pin while transmitting in a loop. ...
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1answer
41 views

Unusual Lemo PCB sockets (male PCB contacts, 2-pin 5B, etc)

I am trying to construct a comprehensive Kicad library of Lemo connectors. While working through the "normal" datasheet (unipole_multipole.pdf), I found several combinations appear to be missing. For ...
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2answers
213 views

High EMI PCB track under transistor or diode package

Can a high EMI PCB track under a transistor or diode package (in this case TO247AC) be a problem? To get a better understanding: Is there any advantage on putting these tracks on the other side ...
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1answer
92 views

Low-cost Up-Down Servo solution

I have a small project and I'm interested "upgrading" to a more produce-efficient design. Please note I'm no electrical engineer. I want to move a small servo (like this one ...