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 design an SMD prototyping board in Eagle

I have little boards that allows soldering one SMD chip, but these must be soldered to pins and then the pins plugged into a breadboard or soldered to a perfboard. Instead, it occurred to me to ...
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0answers
33 views

Product Category

I am designing a single phase energy meter with below Spec - Input Voltage 240Vac - Input Current 0.5mA - Product will be sealed in plastic enclosure - Line and Neutral line, No earth Input in product ...
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30 views

Bluetooth module for custom PCB [on hold]

I am designing a custom PCB with a couple of simple sensors (IR/LED's). I am looking to produce the PCB in bulk and it needs an MCU + Bluetooth Module (To communicate with mobile devices, BLE). Can ...
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4answers
203 views

VCC pour and decoupling capacitors on a dual layer board

I am designing a simple dual layer board which has some ICs that I have to put decoupling capacitors near them. Initially I wanted to make both top and bottom layer as ground plane and route signals ...
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1answer
31 views

Dipole antenna RF Layout

I am designing RF layout on PCB, my PCB is in Circular form, In Pic 1, is my current layout in PCB, since this chip antenna is dipole in nature , so to form the dipole antenna there should be mirror ...
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1answer
26 views

Best way to make connection with rubber contact pad

I dismantled a push-button telephone and I am want to control it using a Raspberry Pi (A+) to trigger the button presses. The phone has a grid of 12 (+2 special buttons) contacts that correspond to ...
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2answers
74 views

Electronics board debugging [on hold]

I have an electrical board with 2 input voltages; one of them is 5V and another is 12V. I set 12V adapter to 5V absolutely in a wrong way. So I've found myself in a big problem. Hope you guys help ...
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1answer
45 views

How to chose via diameter and drill size based on trace width

I am designing a two layer board, the problem is I do not know how to select via diameter and drill size, as well as outer and inner diameters. In my circuit I use 056, 012 and 006 mil traces: I ...
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0answers
47 views

Inner layer routing of LVDS traces in between ground vias

I have ground vias underneath an ADC on a multi-layer board for thermal relief. I am using inner layers to route the LVDS signals for the ADC. The image shows diff pairs on layer 4, which is in ...
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1answer
29 views

EAGLE: Placed bitmap on tStop

By accident I placed an imported bitmap on tStop instead of tPlace. How can I remove it? Unfortunately I noticed it too late to simply undo it.
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1answer
81 views

Why are there unconnected exposed pads on PCBs [duplicate]

I've seen this in several designs. What purpose do these serve?
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3answers
62 views

Using 220v transformer on 110v input

I've been looking for 115v primary 9v secondary 3.2va power rating PCB transformer and couldn't find any to replace the one that was fried. All I find is dual one, instead for example 4 pins it has 8 ...
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2answers
37 views

Interactive Diff Pair Length Tuning Altium Designer

I am using Altium Designer and sometimes (very often) when I am using the Interactive Diff Pair Length Tuning even when I click properly on the wire I have this error : As said in the response below ...
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2answers
37 views

Where to find 4 pin connectors? [closed]

I'm developing a 1x1cm (would be larger after adding connector) imu board and I'm looking to add some type of 4 pin connector to carry 3.3v, Gnd, sda and scl. Where do I search to find such a ...
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1answer
61 views

Symbol on silk screen of design

This is the circuit diagram I used to make my line follower robot. I don't understand the symbol at the right side down corner, the one that is a circle with 3 dots inside. As this is my first PCB ...
4
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1answer
70 views

Clock Oscillator - Topology and PCB Layout recommendations

I'm designing one of my first layouts and I've read a lot of articles and StackExchange questions about guidelines and recommendations. It's a university project realized by another student that I ...
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2answers
81 views

Nomenclature for tested PCB assemblies

I want to unambiguously refer to an assembled PCB that has been tested. I am familiar with the terms: PCB - unpopulated printed circuit board PCBA - PCB assembly, a PCB with all the parts fitted and ...
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1answer
60 views

Clearance distance in a PCB with an insulated barrier

In the image shown below, why is the distance marked with "??" not considered for clearance? Is there a slot under that barrier, or does the barrier pass through the PCB?
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2answers
520 views

Will a cut or a slot in a PCB change clearance or creepage?

Does a cut or a slot in a printed circuit board increase clearance, creepage or both? Some say it will increase clearance, but I don't think clearance will change because, even with a cut in the PCB, ...
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2answers
61 views

'V' groove routing at cheap PCB manufacturers [closed]

I am designing some PCBs, which I intend to prototype, and then get small volumes produced for personal use at a cheap PCB house such as Itead, DirtyPCBs, or Seeedstudio Fusion PCB. These board houses ...
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2answers
62 views

Difference on component size (Resistor, Capacitor, inductor)?

I am wondering if there is any difference (apart the size) between two SMD components who have same characteristics but different size, example: RESISTOR, THICK FILM, 100k, -5%/+5%, 0.063W, 50V, ...
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0answers
28 views

External whip 868MHz Antenna via coaxial cable. Ground Issues

I have a RF module that works at 868MHz.It works as transmitter and as receiver. (lambda:0.345m lambda/4=8.64cm). The RF module ground plane (GND_PCB) is 10x10cm, so bigger than lambda/4. By default, ...
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2answers
41 views

Large Battery Cell mounting in Enclosure

I am trying to figure out the best way to mount a battery like this (http://www.batteryspace.com/polymerli-ionmodule37v10000mah37wh85arate-prewiredwithpcbpl9059156.aspx) onto a 8" x 6" PCB. There do ...
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2answers
76 views

Difference between UL and Non UL PCB [closed]

I observe two identical PCB except the UL logo mark on them , one has UL mark but other don't. What is the difference between them. why dont they print UL logo on both the PCB if both are same.
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2answers
66 views

UL procedure of PCB Design

I Need to design a Energy meter ( Single phase 240 Vac, 0.4 mA ) , its a industrial product with enclosure of IP 67. I need to design PCB for this product as per UL. I am new to UL procedure so please ...
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1answer
66 views

Schematic components

Does anyone know the names of these two components labeled 50 Hz and 60 Hz, so I can find them in proteus program?
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29 views

Senseo & Raspberry PI soldering circuit board

I am kinda new to the whole hardware stuff and as an amateur I am working on a little project. I would like to connect my senseo machine to my Raspberry Pi. I've got a senseo HD7810 and a Raspberry Pi ...
4
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1answer
51 views

Crosstalk analysis, Altium vs. the World

I am trying to understand the real-world effect of crosstalk between nets, and I find I cannot match the data from abstract calculators (like Saturn's PCB toolkit and others) and the Altium crosstalk ...
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1answer
53 views

What does this statement about fiducials mean?

Found this slide and I didn't understand the last statement. All fiducials should have same image one layer down Are fiducials not top/bottom layer registration targets during assembly ? Are/Can ...
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0answers
25 views

Negative Artwork in Altium

I wanted to print the negative artwork from a PCB that I've designed. The problem is that I couldn't find that option in Altium Designer. I found that I can create a solid layer and then play with the ...
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1answer
41 views

What Electronic Component Marking On A Circuit Board Is Designated For BF?

While looking at ESR values for capacitors on a failed Samsung refrigerator circuit board I was looking over other components for telltale signs of failure and spotted an unusual component that I ...
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1answer
46 views

Common ground between a current source and a power supply

I want to design a simple circuitry for testing a bench top current source through a load resistor. I want to use MAX9611, and read data through I2C by a micro-controller. The rough circuit schematic ...
5
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4answers
334 views

Can you load Gerber files back into a PCB layout designer such as Eagle?

There's a PCB I may need to change a solder pad, but the schematic and layout are gone and were not added to source control. Is it possible to load the Gerber files back into a designer to change the ...
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2answers
51 views

Is there a place to get sample printed circuit boards? [closed]

I'm planning on building a project, but it involves me probably using some circuit boards. Most if not all of my parts that I have I got from SamTec, who gives free samples of different kinds of ...
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1answer
49 views

Arcade stick PCB not working as expected

I am using Logitech precision PCB to make an arcade stick. I am having a problem in button 1 (green) area. While I try to solder button 1 via R2, I had a great difficulty - R2 resistor moved every ...
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1answer
79 views

Impact of PCB revisions on its embedded software

Over the past couple of years we have done some minor revisions to our PCB, including Different component selection (resistors / caps / ...) based on availability / price (while still taking into ...
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1answer
106 views

How do I solder this red part in PCB?

I am making an arcade stick. I was making good progress on the right hand side but now stuck on this red circle bit. For the RHS I had this socket(?) that I can put solder on easily But this red ...
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19 views

Phase Velocity in PCB Edge Coupled Microstrip

I would like to calculate the phase velocity (\$v_p\$) in an edge coupled (differential) microstrip such as the below. It's possible to calculate \$v_p\$ for an embedded microstrip with the ...
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27 views

Proteus - Short pin to ground plane and PCB hole

I am using Proteus 8 to design a PCB using manual routing (not Auto-routing). I included a ground plane using the Zone Mode button. How can I short a single header connector pin to the ground plane? ...
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2answers
78 views

LED Circuit- Beginner seeks help

I am a beginner in electronics and circuits and I decided to make my first circuit. It is an arrangement that spells SPEC with 5mm LED lights. I familiarised myself with the basic concepts (Voltage, ...
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3answers
124 views

PCB in circuit tester design

Imagine you want to produce 1k pcs of hardware(mixed signal) per month and you would like to have tester in order to load firmware, calibrate sensors etc. How do you approach that problem? I see many ...
3
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1answer
52 views

What is the antenna gain of a mobile phone?

I'm working on a GSM/3G Project and my team has a small doubt about antenna gain selection. All along we were using a 3dB PCB Antenna connected via U.FL/IPEX connector. The antenna does a good job ...
5
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2answers
978 views

Where is this LED getting its timing from? [duplicate]

So this little board when connected to 5v and GND start blinking different colors in different orders and with different timing for colors to stay on! There is nothing on the board other than the LED ...
11
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2answers
179 views

PCB Ground Pour, Crosstalk and antennas

I'm trying to understand the effects of polygon pour fills when high speed line transitions might occur. Consider the fabricated case example below: In this example the tracks (colored in light ...
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25 views

Crosstalk in current loops

I'm trying to understand the interaction between two signal lines. The image below shows two planes (left and right) which have connector pins (bold lines). The top signal line is the "driving" line ...
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33 views

help needed for ublox pcb

I am back to the basic and I want to get I right this time, I am asking to check my prototype of just GPS + patch antenna, I have made a trace of 1 mm width, as I read online about 1.6 mm thickness, ...
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0answers
12 views

What kind of ports are on this PCB? (Kangaroo Pocket PC) [migrated]

| Overview Please refer to the teardown of the Kangaroo mini PC (below.) I am interested in finding out as much as I can about this board and the ports associated with it. Any details/specifications ...
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2answers
66 views

How do you drill a homemade double sided pcb

I have a PCB that I am prototyping at home and it is double sided.... When I drill on one face the other face peels up a little. Does any one know how to avoid this problem?
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246 views

Moisture adsorption on FR4 PCB [closed]

Although the adsorption of moisture by FR4 is quite low, what is the best way to minimize it or eliminate it completely?
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6answers
2k views

Why are through holes PLATED in PCBs?

As far as I understand, through holes in PCBs are often plated, hence the term PTH. Letting red denote copper, the first figure shows a through hole which is plated, and the second figure shows one ...