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)

2
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2answers
265 views

Clock generation on my PCB

I have not a big background in electronics. I am designing a PCB including a MCU (EFM32) and some ICs. I have seen in lots of circuits that they generally add an external Crystal Clock on the board ...
0
votes
1answer
39 views

Serial Connection Not Working on Modified Router [on hold]

I have a Sagem F@ST 2504 router. Following the advice from OpenWRT wiki (http://wiki.openwrt.org/toh/sagem/fast2404) I managed to solder the header pins in the correct place. I've attached pics below. ...
0
votes
1answer
34 views

EAGLE detecting error at Copper Trace intersecting Dimension Outline

The ARDUINO_MEGA part from the Sparkfun Eagle Library is used in my board design. However when performing a DRU check, it seems that there is an error where the top ...
0
votes
0answers
30 views

PCB specifications for 2.4 GHZ RF Board

I am designing an RF module with a PCB trace antenna. I'm wondering what PCB specifications will have a significant effect on the quality of the RF Signal. Is there a prefered laminate and immersion? ...
-2
votes
0answers
46 views

Cheap CNC PCB machine kit [closed]

Is there a cheap kit available for making PCB's? I have looked over the internet and saw the mantis one, but I can't see a kit, only things like the design. I want one that is able to make PCB with ...
-1
votes
1answer
35 views

What bluetooth chip / type should be used for a remote control car? [closed]

I am building a small remote control car to be controlled by bluetooth (iOS and Android). I am having a custom circuit board built, and I want to know what bluetooth chip I should get. I would like ...
0
votes
0answers
10 views

DIN 5 keyboard to USB? [migrated]

I have an old keyboard with a DIN 5 connector, I noticed that the wiring on a DIN 5 connector is basically identical to the USB based 4 contact wiring. Can I just blindly wire a DIN 5 ( starting from ...
2
votes
2answers
653 views

PCB design review: Decoupling, bypassing and grounding

I'm trying to make my own wireless sensor using ATmega microcontroller. I've some basic understanding of electronics but I'm a total amateur when it comes to designing circuits and PCBs. This is just ...
2
votes
2answers
64 views

Ethernet 25 MHz and 50 MHz harmonics cuases radiation emission during the EMC lab test

My PCB has been suffering with 25 MHz and 50 MHz harmonics radiation emission. I am using STM32F207 microcontroller operating with 8 MHz crystal. I am interfacing MAC in microcontroller to PHY ...
2
votes
1answer
54 views

PCB assembly cost per-board

I know this question might get closed because of being opinion depended but I couldn't find any answer from google or any other search, so I decided to ask it here. For clarity of question I want to ...
-1
votes
0answers
29 views

KiCAD footprint of a crystal

I am not sure how to create some not so common footprint in KiCAD. I am using this 40 MHz crystal for my design. The bottom of the crystal looks like this. How can I create those arcs and joints ...
0
votes
2answers
51 views

Testing a board without placing a component

Is there a way to build a (functional) board without placing 1 component? I am designing a PCB and want to have the option to make it work w/ or w/o placing a specific component (X). This component X ...
5
votes
4answers
447 views

How can I make a decent ground plane in Eagle?

I've made a couple of simple PCBs as a hobbyist, and for the first time now I want to add a ground plane pour but I'm having some issues. As I have currently understood I need to: Create a polygon ...
0
votes
1answer
49 views

How to explicitly connect hidden pins in eagle?

I am working on a project where I used a shift register 74HC595N which has hidden GND and VCC pins in Eagle. So I used the invoke property as shown in the pics, and connected the VCC and GND to the ...
1
vote
0answers
85 views

Single- vs double-sided PCB assembly costs

I'm working on a new design (still laying out the components) and I have a chance here to reduce the size of the PCB by roughly 40%-50% if I use the other side for a QFP-100 IC (so it's heavy and will ...
1
vote
1answer
46 views

Solder mask for 0.5mm pitch TQFP

I'm using Atmel SAM chips and the data sheets don't have any mention of solder mask clearance for their TQFP packages. What would be a nominal pad/solder mask opening/cream size for a 0.5mm pitch ...
0
votes
1answer
88 views

Suggestions for in-house PCB/FPC lab? [closed]

We are a hardware startup based out of Greece, looking for in-house PCB/FPC fabing solutions/equipment. LPKF's ProtoLaser U3/S look great but they cost $140K and $70K (if I'm not mistaken) ...
0
votes
1answer
50 views

Connecting Terminal Blocks to Second PCB Board

I have a daughterboard with 3.5mm screw terminal blocks (such as Digikey part # 277-5749-ND) that has to be connected to the mainboard, with the daughterboard either parallel or perpendicular to the ...
0
votes
0answers
25 views

KiCAD pin assigment

What would be the best way to connect multiple pins of a module/footprint to a single pin in the schematic in KiCAD? Do I have to edit the module and set the same pin name for the pins I want to ...
0
votes
0answers
38 views

Mounting a PCB with velcro

I need a lo-fi way of mounting a PCB (Tessel plus RFID card) under a table. The easiest method by far would be velcro but I'm worried about static discharge frying my circuitry. Should I be?
1
vote
0answers
41 views

Qi Receiver on PCB

I'm looking at implementing Qi charging in my project, would it be possible to have a Qi receiver directly on the back of the PCB (copper traces in the shape of a coil)? Could this interfere with the ...
1
vote
1answer
51 views

Orphan polygon not filling

I'm trying to have an area of my PCB with the same geometry on the top and bottom copper layers, but I'm having trouble with the polygon on the top layer. I placed vias on the bottom contacts (which ...
0
votes
0answers
53 views

Mobile Phone GSM Antennae Used | What are the Latest Types?

What is the best antenna type mobile phones are incorporating nowadays for GSM/GPRS connectivity? Is it PCB etched antennas or anther? I want to know this because mobile phones have the same ...
2
votes
0answers
43 views

Is 3dBi PCB etched GSM/GPRS Antenna Possible?

Is it possible to design a GSM/GPRS antenna that has a gain of 3dBi? if not, what is the maximum gain possible with a PCB GSM/GPRS etched antenna? I'm thinking of a PCB sized 11cm long and 5cm width. ...
1
vote
1answer
84 views

Formula for voltage drop vs PCB trace width, temperature, current, and trace length

I need to find out the voltage drop in the PCB traces with respect to the possible factors like: copper thickness, trace length, trace width, temperature, etc. I found some calculators available at: ...
0
votes
1answer
56 views

Why should PCB design be mirrored before toner transfer?

I am currently designing a PCB to make with the toner transfer method for the first time. I was reading a guide that said to mirror the image before printing it to the paper. However it seems that the ...
-1
votes
1answer
77 views

What could it mean when a chip will only work right when its hot? [closed]

My screen started dieing like a year ago. Initially, I noticed that when turned on when cold, all I got was snow on the screen. It would quickly go away though as I restarted the screen a few seconds ...
2
votes
1answer
62 views

PCB Crosstalk calculators… Center line distance or trace separation

I am still a beginner in this field, and recently I've learned about Crosstalk and Crosstalk calculators. I've tried the one on EEweb, Saturn, Ultracad and some others. Some of these calculators ask ...
0
votes
0answers
22 views

EAGLE footprint not sizing correctly

So I had trouble in kicad printing a gerber file with a correctly sized footprint for a generic .1'' 2x20 pinheader. On advice, I switched to EAGLE but this time before I modified any of the parts, I ...
0
votes
1answer
42 views

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
votes
1answer
43 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
votes
1answer
94 views

Expressing a circuit in the form of block diagram [closed]

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
votes
2answers
734 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 ...
1
vote
2answers
152 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 ...
0
votes
1answer
116 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
votes
1answer
59 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 ...
1
vote
2answers
186 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
votes
2answers
117 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
votes
1answer
196 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
votes
1answer
112 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 ...
4
votes
3answers
407 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 ...
1
vote
1answer
57 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
votes
3answers
195 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 ...
5
votes
4answers
417 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 ...
1
vote
0answers
105 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 ...
1
vote
0answers
56 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 ...
0
votes
1answer
75 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
vote
1answer
110 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
votes
4answers
212 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
votes
3answers
160 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 ...