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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In Altium Designer, how can you set the autotracer to route all traces with as equal lengths as possible?

Note that this board does not require a power or ground plane, since it's just used to bridge two boards. I want the traces to be as equal in length as possible in order to minimize any difference in ...
2
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1answer
27 views

Cutout a polygon from another in any layer in Eagle CAD part creation

I am trying to create a part with a bespoke pad. How do I cut one polygon (for where the hole will be) from the original pad polygon. I don't just want to make a dimension layer and let the PCB house ...
-4
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1answer
83 views

Expressing a circuit in the form of block diagram [on hold]

I am doing an electronics project for 12th grade in electronics.This project is about water level controller.I have component list along with the description and I have soldered the circuit as told.I ...
10
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2answers
708 views

How to route with minimum noise

I'm facing a dilemma on how to route correctly in order to minimize noise on a data signal line. In the example bellow there is a 2-layer flexible PCB (which is very thin). The copper layer is 1OZ and ...
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2answers
143 views

Complexity involved in building a single board computer [closed]

Our high school has tasked my and a friend of mine with with building a web connected controller for a hydroponics system. The school has budgeted 5k for us to spend as we like, and we are intent on ...
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52 views

Are my caps bad? [closed]

My clock radio seems to have died peacefully in its sleep last night. I followed the limited troubleshooting info on the mfg's web site. It's an iHome iP9. I checked the wall wart and it's putting ...
0
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1answer
110 views

Is there any problem with soldering a charged battery?

I have a project in mind that amounts to little more than rebuilding a broken eGo-T (electronic cigarette). The battery when I took the busted eGo-T apart had quite a kick and I got a minor burn from ...
0
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1answer
56 views

What fedex paper to use for toner transfer

I am very new to creating PCBs and I am planning to make my first one in the upcoming weeks. I noticed that all the instructions and tutorials called for using a laser printer which I do not have ...
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2answers
130 views

How about soldering microSD card directly to PCB?

I know that microSD cards are typically not designed for this type of use, but has anyone tried this? Would it be possible in production ( >1000 units), that is, would any PCBA service be able to do ...
2
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2answers
109 views

Soldering with a delicate looking board

Short story: I want to solder cable to a pretty delicate looking board. There is not a lot of room to get at things so I need to be careful not to just screw everything up plus the PCB looks fragile ...
2
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1answer
131 views

Any better alternative to produce PCB than UV etching

I hope this is an appropriate question to ask it here. I work for a small start up company that has a limited budget. We have UV box, etching tank, etc from manufacturer like Mega UK. Our problem ...
0
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1answer
48 views

Cadsoft EAGLE Some objects extend outside the allowed board area

I'm trying to Modify an eagle file that I have, it's a relatively simple circuit and I'm using the free version of Cad soft Eagle to do it. One of the components on the board is a 4 pin plug, I'm ...
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3answers
394 views

Can I prevent copper traces from delaminating due to soldering heat?

I'm making a PCB that has a 100pin QFP pacakge microcontroller. After gaining experience with the UV photoresist process and reliably making the small, 0.5mm traces, I have a new problem: the copper ...
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1answer
53 views

PCB/SoC component licensing restrictions

Let's say I plan on building a consumer electronic system (some electronic product). This system would have a PCB and a plethora of various components: LEDs, transistors, resistors, light sensors, ...
3
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3answers
174 views

custom FPGA PCB Design tips

I am planning to design a custom FPGA PCB. the PCB will contain sensors. I need to read the output of the sensors and process them in the processor. I have completed many projects using FPGA's, but ...
4
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4answers
366 views

Why did my homemade PCB turn out like this?

I did a first experiment with the UV-lamp + Transparency + Presensitized-Board method. Using a randomly drawn pattern, this was my (promising but unsatisfactory) result: What could typically be ...
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0answers
59 views

Is there a Raspberry Pi B+ GPIO header footprint for kicad?

I attempted to make my own using the ModEdit utility in kicad but I'm still having issues adjusting it to the grid even though I followed the standard 0.1'' pitch. It still seems to be off. Is there ...
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0answers
47 views

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

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
59 views

Add male pin headers in DesignSpark PCB [closed]

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!
1
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1answer
92 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 ...
2
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4answers
192 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 ...
0
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3answers
143 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
134 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 ...
3
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3answers
106 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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38 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
91 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
88 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
99 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
59 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 ...
2
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3answers
138 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 ...
8
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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 ...
2
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2answers
56 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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30 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
55 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
65 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 ...
3
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1answer
230 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 ...
4
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2answers
113 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 ...
2
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1answer
70 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 ...
7
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3answers
621 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 ...
1
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1answer
31 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 ...
0
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3answers
57 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 ...
2
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2answers
86 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, ...
0
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1answer
63 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
719 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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21 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 ...
0
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4answers
250 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
24 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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50 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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34 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 ...