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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the design interface between a flexible printed circuit board and a custom enclosure

I'm interested in creating an electronics project. The project will include a printed circuit board and a custom plastic enclosure for the board. The board will be a flexible printed circuit board ...
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1answer
85 views

Differential pair impedance calculation

I'm having troubles calculating the characteristic impedance of USB/Ethernet traces for a pcb. The Saturn PCB design program calculates values where I'm not sure if they are correct. I want to use a 4 ...
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2answers
50 views

Inkjet Printers+lamp+unused pcb can It work?

So suppose I have design x Can I print design x inverted onto paper, shine a lamp on it above unused pcb and make a printed pcb? Sorry for my ignorance Cheers!
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25 views

any tips to find falts and servicing electronic pcbs? [on hold]

I got job in an electronics servicing company I got basic training but I would like to be learn more so that i can be a out standing worker.I am not a degeree holder i have completed my diploma in ...
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1answer
35 views

Basic voltage divider issue in my amateur circuit XBee

Once again I need your help in my project. I have a 4,5v powered circuit. I put a voltage divider with 2 resistors in series to reduce my initial voltage of 4.5V to 3.4V (to feed an XBee module). The ...
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1answer
35 views

Hole diameters in PCB software - finished or tool size?

Should I specify the diameter of holes on my PCB as before plating (tool size) or after plating (finished)? Michael Leonard says finished Olimex says tool sizes Pcbex says finished ... Thank you ...
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1answer
62 views

pcb etching: chemical method or milling [on hold]

i'am actually intending to install a small pcb production process (100 pieces per day) and i am still hesitating on the etching method: chemical or with a milling machine !! I would prefer a cnc ...
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1answer
34 views

Circuit Track Design in ARES

I want to know how to make the below shown circuit diagram in ARES using a single layer of bottom copper. When I tried it the tracks intersected with one another and I had to add either a jumper or ...
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1answer
80 views

What are the ports on PCB used for? 14, 10, and 4 pins [on hold]

I have two boards that have ports labeled j1 (14 pins), j5 (4 pins) and on a separate board that is not the same type of device there are j7 (4 pin), and j1 (10 pin) ports. What is their purpose? I ...
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2answers
54 views

Is soldering extra wires to increase current capacity on a pcb trace good design?

I was working on a bunch of PC PSU organ donors and noticed that on lots of them through all the wires that lead the power to the outside there were wires soldered, and lots of solder added. This is ...
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1answer
51 views

Copper weight/thickness current capacity

i have been reading about how Copper weight/thickness is important in several areas of PCB design. The thickness and width of a trace determines the amount of current (amps) the trace can carry. The ...
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4answers
174 views

PCB Layout, Functional vs Actual Pin Order

I'd like to continue this conversation here: CAD Schematic pin arrangement approach Basically, there are 2 major ways to do schematic symbols, either with true pin order or by grouping pins by their ...
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7answers
2k views

How do I make sure my electronics design is good from manufacturing perspective? [on hold]

I am a beginner in electronics design. I have some experience with fairly complex PCB design. I want to design a product that will hopefully sell a lot. How do I ensure that the design is inexpensive ...
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2answers
84 views

USB multiplexer - swap pins?

I want to use the USB 2.0 multiplexer TI TS3USB221ARSER. But on the PCB the D+ and D- pins of one connection are crossed (see attached image). Is it okay to change the D+ and D- pins on all sides of ...
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0answers
38 views

Can I link Ethernet chips on PCB? [duplicate]

I read up on the Raspberry Pi Compute unit and wanted to link a hand full for networking. Unfortunately, they do not come with native Ethernet, but USB. So I was thinking of linking each compute ...
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2answers
83 views

How to measure the PCB size?

Can somebody share me your methods measuring the PCB size in CAM Software ? In PCB house ,we always measure the size according to the centre of outline and get the final size of the unit board or ...
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2answers
89 views

Will forced air on PCB improve current capacity of trace?

If a trace can carry 3A for a temperature rise of 20°C, will adding forced air over the board increase current capability (by any factor)? Is the current limit defined by the heat or is it the ...
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4answers
107 views

routing a 4 layer PCB

I am currently routing a 4 layer PCB and I was wondering how I connect the ground and power planes to the connector and components that need them. Do I simply leave the two planes without routing on ...
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1answer
44 views

Altium 'Adaptive' Routing

I recently switched from Mentor Graphics Expedition to Altium 14. I really like a lot of Altiums features but efficient routing still eludes me. In mentor my typical workflow was: Place components ...
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4answers
519 views

How to attach an electronic enclosure to glass?

I'm developing a very small PCB that I'll put inside a small case that will be attached to glass, let's say for example in a car. Once you attach this to the glass, it should stay there for a long ...
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1answer
45 views

Connectors that protect wires from breaking when it is resonating alot

I am building a robot vehicle, that is resonating alot when it is in rough areas. Cause of this the wires in the robot will resonate a bit too. When this happens every now and then a 'vein' (tiny ...
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1answer
89 views

Ozone and electronic equipment

Hopefully this is the right community to ask this question. Does anyone know whether there is a significant chance that ozone at approximately 15 ppm will damage consumer electronics, speakers, ...
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27 views

How to use vias in Proteus ARES?

Thanks for reading this. I am building a 2 layer PCB. My question is quite basic. I just don't know how to use a via in Proteus ARES. I can place a via down, but then I cannot route tracks to it. ...
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3answers
55 views

signal ground and power ground

I'm making a PCB with two ground signals, power ground and signal ground. These two shall be connected together at one spot on the PCB, after recommendations from the datasheet. But how is this done ...
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0answers
55 views

Altering a PCB for building a testing rig

I design my PCBs in Eagle and my CEM wants me to design a duplicate PCB with modifications on certain pins for springed pins to fit through. This seems extremely difficult in Eagle as it requires me ...
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1answer
1k views

Why use a 0 ohm resistor? [duplicate]

My customer's schematic uses a 0 ohm resistor for connecting analog(AGND) and digital (DGND). I think it is for testing, current measurement , fuse, jumper, test point etc but is there another ...
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39 views

Component Guide Pins on PCB Footprint

I've just been working my way through and getting more experienced with Altium, I've almost got it doing exactly what I need for my design. The last thing I can't figure out is how to define the guide ...
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45 views

What's the best way to secure an input-port onto a PCB by hand? [closed]

I have an expensive Rosewill keyboard that has a serious design flaw: the usb input-port is secured solely by two thin metal wires soldered onto the PCB. Despite handling it very carefully, the ...
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1answer
102 views

Need help with a vertical mount, male A USB connector

I need to figure out a way to get a Male A USB connector to vertically attach to a PCB. Ideally, we wouldn't use a surface mount right angle connector. Any help would be greatly appreciated! Most ...
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1answer
174 views

Unable to delete Trace in Eagle

After running the design through the Errors Tool and moving a route that had insufficient clearance, I'm left with this blue segment that is overlaying the red route. Why is it there and how can it ...
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44 views

Relay Matrix PCB

I must design a 2-wire 6x8 relay matrix. The matrix must be used to connect some measurement instrumentation (oscilloscopes, DMMs) to DUT(device under test) pins. 6 rows will be used for 6 ...
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2answers
96 views

How to connect this potentiometer to this PCB?

How am I supposed to connect this potentiometer to the PCB?
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0answers
39 views

Drawing a tactile switch in Altium

I apologize if this is a bit broad, but I'm struggling to use Altium Designer 14.3. I've got a tactile switch I need to arrange a few of them on my board with some pin headers and LED's. The switch ...
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33 views

Bluetooth antenna design

I am building a system with bluetooth/wifi/GSM. Since I am an RF noob, I have some questions regarding antennas. Some modules come with loop antenna and if you want to create your own PCB there is a ...
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2answers
85 views

Pad hole size for 0.1" Male Headers

I created an Eagle part that has several holes to solder 0.1" pitched break away male headers to, such as the one below. However the pad has a hole thats too narrow for the header! What drill size ...
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1answer
84 views

How to create footprint from IC diagram when no recommended layout is given?

I'm a student trying to create a library part in Altium for an Analog Devices AD8232. Most IC datasheets give a recommended footprint to use, but the AD8232 datasheet only shows the IC itself: I ...
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3answers
952 views

Cleaning PCBS… using water?

I found this video where a technician with a lot of experience seems to clean his PCBs using water, and then he just puts it in the sun so it can dry. I was just amazed to see the circuit keeps ...
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1answer
50 views

Breadboard jumper cable to PCB

I want to do some prototyping with a microcontroller on a breadboard. The microcontroller won't fit in the breadboard holes because it is square and small, and has many pins I won't be using. I ...
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1answer
151 views

What is this foreign material on my outsourced PCB?

I had this board populated by an EMS house. There is foreign material around some of the pins. They don't know what it might be. Our collective best guess is that it is somehow shavings from the ...
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1answer
100 views

Is it bad to route a trace edge of a rectangular pad?

I got a quick friendly critic from someone in production for the below trace that I should not route the trace from the edge of a pad. What he said that it would create an extra force to the trace ...
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1answer
57 views

Ways of PCB Etching other than Photosensitive Spray or Toner Transfer

Toner Transfer is not an option for large quantity or quick production and in my area I could not find any photosensitive sprays. I tried with screen printing emulsion, but it does not stick with ...
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2answers
64 views

Am I going to encounter grounding issues with this PCB design?

This is my first time designing a PCB, and because it is part of a project at uni I have the intention of manufacturing it afterwards. The circuit itself is a voltage-controlled oscillator designed ...
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2answers
62 views

Taking the edge/ring off a clock signal with an RC circuit?

I'm designing a board for a hobby project where I am using a lattice machxo2 cpld as a system interconnect. The cpld needs to be clocked at 80-100MHz, and because I sprung for a cheaper cpld, it has ...
6
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4answers
677 views

What is the purpose of holes on edge of the PCB?

Here is a photo of one of Texas Instrument's RF EVMs. Please pay attention to edge of the PCB that has multiple tiny holes. I marked 3 of them with a red circle on the photo. What is the ...
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2answers
37 views

Unidentified Component and RefDes EC

I am trying to identify components with RefDes EC1 and EC2 in this circuit (the boxes at the top with markings 100-10Z). I have done a lot of searching and EC is not even an accepted RefDes EC. I ...
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58 views

Problems with Infrared circuit on a PCB - Is it the board or schematic?

I am using the toner transfer method to apply my circuit for 6 sets of infrared emitters and collectors connected to an RJ15 cable on a PCB for use with a Raspberry Pi B+ board (connected via IDE ...
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1answer
92 views

Why are these Vias of Different Shapes

While looking at how other circuits bring AC mains into their circuits, I came across this design where there are 3 differently shaped vias (from top to bottom): Figure of ...
21
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2answers
929 views

'bridges' on a PCB copper layer

I've come across a design where each pad was connected using 4 'bridges' to the GND copper layar. What stands behind these 'bridges'? Why not make a full copper layer with only solder-mask defining ...
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2answers
76 views

Why the \$F_{knee} = 0.5 / T_{r}\$?

In "High-speed Digital Design - A handbook of black magic" p. 2, The knee frequency for any digital signal is related to the rise (and fall) time of its digital edges, but not to its clock rate: ...
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Altium can't output NC drills file?

I'm about to send my gerber files to OSH park however I'm having trouble generating the drill file in Altium 14.3. The output file is some other format than the Excellon / NC Drills file that the fab ...