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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3answers
57 views

Output of voltage supply drops to about 1V from 5V

I have fabricated a PCB board. It consists of the following circuitry: 9V - 78L05C - (a circuit consisting of resistors, opamps, comparators, analog multiplexers). When I power the circuit using 9V ...
0
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2answers
59 views

PCB via, increase annular ring or increase hole size?

I have to use via to route small analog signals. If I want to minimize the effect of via on the signal, should I increase the annular ring size or hole size. Lets say the total via diameter is same in ...
1
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0answers
16 views

Place logo on Top layer in Altium

I use the "PCB Logo Creator" script to convert my BMP logo and import it into the top layer. It works well. But I don't want to do this "conversion" every time, so I made the generated logo to a part ...
0
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4answers
73 views

PCB Ground Plane

I am designed a PCB in Eagle and I am new to doing this. I have created a ground plane on the bottom layer that covers the whole board but I still have a few traces running through the bottom layer ...
2
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1answer
132 views

What's the meaning of the “key” symbols in Altium?

I'm routing a PCB board with Altium. Today I find when my mouse hover on the pads, it shows some shadowed "key" symbols. What's the meaning of them?
0
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1answer
22 views

Eagle Cad: change default drill size list

Eagle Cad specifies certain drill and hole sizes, for example, used for VIAs, when routing. I know that I can enter the drill size in the combo box and it will be remembered. But all the other ...
0
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1answer
15 views

How to fix line to line spacing error in Allegro?

I have a line to line spacing error in Allegro. I don't know how to fix it. If I make the width of the trace smaller, it gives me a line to width error. And I also don't understand Why I get this ...
0
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0answers
31 views

Finding pins for ASUS pc_diag rev 1.01g [closed]

What are the data pins to control the 7 segment LEDs of this small PCB? I found it with an old ASUS motherboard (see image), it contains an Altera EPM3032a. I'm not an electronics expert, so any ...
1
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1answer
24 views

Effects of encasing bluetooth chip and rechargeable battery in an adhesive encapsulate?

I am thinking to encase my entire bluetooth PCB along and connected battery in an adhesive such as a soft urethane or silicone encapsulate. My board and battery are each about the size of two stacked ...
0
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2answers
55 views

Desoldered Resistors on rotary encoder breakout can I just short them togather

Someone gave me this rotary encoder breakout, but they unsoldered the SMT resistors for some other project. Now I don't have any SMT resistors on hand and can't justify buying a roll of them. So would ...
0
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1answer
31 views

PCB Mount Push Button Identification Help

Can anyone help me identify the push button on this PCB board taken from a router? The button is circled in RED and is the one on the backside of the router, used to turn it on/off. I would like to ...
9
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3answers
383 views

Why print a PCB module on ceramic?

This is what I am talking about (click to enlarge): It is from an old (1990s) telephone system. There were multiple lines, some digital, some analogue, and in the output stage these modules (double ...
0
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1answer
34 views

Grounds on an Evaluation Board

For testing purposes, is it ok to assume that every ground pin on the EV board is the same? even if not connected to each other explicitly? i.e. when using measurement probes is it ok to stick the ...
0
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0answers
7 views

Fixing “L W” drc error in allegro?

How do I fix an "L W" DRC error in allegro? I know that this indicates a problem with the line width but I don't know how to fix it. I am routing traces to a component that is very small and when two ...
0
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1answer
41 views

RC low pass filter PCB layout limitation

I have an RC low pass filter for debouncing a GPIO input. Do I have to place the resistor and the capacitor close to each other? Currently the capacitor is near the GPIO pin, and the resistor can be ...
0
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0answers
47 views

fiducials on a panel

have a little question about fiducials: My Layouter/My Boss likes to use 3 fiducials on the panelframe and one fiducial on each individual board in the panel. My job is to build the program for the ...
0
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0answers
42 views

What to look for in a CNC PCB router?

When shopping for CNC routers for milling PCBs, there are some specific tools and others that seem to be fit but are meant for other types of works (typically engraving wood or advertisement). For ...
2
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2answers
336 views

Texas instruments component size

I am about to make a pcb footprint for this package: http://www.ti.com/lit/ml/mpds049b/mpds049b.pdf But I am not sure what the two numbers mean, for example at pin 5 that 0,30/0,15. Are these ...
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0answers
15 views

Removing a board outline in allegro?

In allegro, is it possible to remove or re-size the board outline after I have laid out all my parts?
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0answers
21 views

Connect pins with same pin desinator in Altium footprint

I've made a relay's footprint in Altium. The relay's two contact terminal are three pads each, as below. And the schematic symbol is as below: In my schematic, I don't give the two terminals any ...
2
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5answers
69 views

Correct way to define board outline?

I'm a student and am almost ready to have a PCB I designed fabricated, but I'm confused about how the board outline should be defined. Here's what I currently have: I also have a 20mil keepout ...
0
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1answer
31 views

Problem with circuit cam, can't view my top layer?

I have a circuit laid out in allegro and I'll be milling it out on a board router. I'm using Circuit Cam to produce the files needed for the board router. I have three layers, a top layer, a bottom ...
1
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1answer
45 views

How to export and print the PCB in Altium

Hi I have done a very basic PCB (only one layer) with Altium, but when I'm trying to export the pdf, the obtained file has different sizes: in particular my 15x15cm circuit is expanded to the whole A4 ...
0
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1answer
16 views

Allegro: How do I view the identifiers of all my components?

I'm using Allegro PCB editor to layout a board for a circuit that I'll be cutting out on a board router. In allegro PCB editor I just imported the netlist and I used quickplace to automatically place ...
2
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2answers
149 views

Eagle - non solder mask defined (NSMD) pads

I am designing a PCB layout in Eagle and in the datasheet of my modul it is said that "Non solder mask defined (NSMD) type is recommended for the solder pads on the PCB". Does it mean that there will ...
0
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0answers
22 views

Grounded coplanar waveguide with KiCAD

I am trying to design a simple pcb board with a grounded cpw (see attached image). I am totally new to KiCAD, and just need some help to get started. How do I design the top and the bottom (grounded) ...
1
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1answer
35 views

Pad with 4 pins in allegro cadence (orcad)

Sorry for silly question, but how to draw pad with four pins? It's not just a custom shape of pad, it has 4 pins. Thanks
0
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4answers
159 views

High power PCB to PCB connector names?

Trying something new out, I'd like to make an 'attachment' PCB that will slot into my mother-PCB, and all the questions here have said to use a kind of edge-to-edge connector or a ribbon connector. ...
1
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0answers
22 views

SMD thin/thick film resistor in external Magnetic field

I have an application where the need is to use SMD and MELF type resistors that have tolerance of 0.05%. I prefer the Vishay thin film resistors. Then comes another constrain -> The entire PCB needs ...
4
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3answers
1k views

PCB opaque coating for anti reverse engineering?

Im trying to find a coating for my PCB in order to protect it from reverse engineering. I want it opaque, non-conductive and with a low thermal resistance. Basically I do not want that someone ...
0
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2answers
36 views

Pin numbering in OrCAD?

I'm getting another error in OrCAD when I try to create the netlist. When I try to create the netlist I get this warning: ERROR(ORCAP-36022): Pin number missing from Pin "DRIVE" of Package ...
1
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1answer
86 views

Strategies for using perfboards without pads?

I'm finding it a little bit cumbersome to work with a gridded perfboard with holes that have no isolated copper soldering pads. Specifically, I'm finding that I need to make create a big wads of ...
1
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1answer
47 views

Should courtyard information be included in gerber files for manufacture?

I just used 4pcb's free DFM checker and it doesn't like the fact that the courtyard line widths on my board are 1.968mils (what Altium generated in the IPC component wizard). It's also complaining ...
2
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3answers
88 views

How do I detect human touch on a point on the PCB?

I want to print buttons in the silk screen of one side of the PCB. And, I want to detect if a human finger touches any of these areas. What kind of sensor should I use? Can I do this without using a ...
1
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4answers
87 views

PCB alterations post-production. Or, how do I not stab myself while scraping off the copper?

I made a PCB that I am happy with (it works!). This is for a power circuit, and I have realized (way too late) that I want a switch on the board as well. I bought a switch from a hardware store that ...
1
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1answer
29 views

Gerber file mirrored

it's the first time that I create gerber files for a pcb printing website. I'm looking to the bottom layer with a gerber view, but it doesn't seem to be mirrored... it's the same view as in eagle, ...
13
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3answers
648 views

Is it OK for traces to come off SMD pads at the corners?

I'm working on a PCB and have found it very convenient to connect adjacent passive components by running traces between them diagonally, as shown below: Is this bad for any reason?
3
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1answer
68 views

How to panelize gerber files?

I am planning on ordering a panel with four different designs on it. Two were made in Altium, while the other two were made in Eagle. Altium has a great tool for panelizing boards designed in it, but ...
2
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1answer
59 views

Vias under thermal pads

I'm working on a design with MOSFETs and with the LT4415 device. The MOSFETs should dissipate an average heat of 0.45 W (with peak at 2 W but just a couple of seconds with several minutes to ...
0
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0answers
12 views

Individual Control of 4 DC Motors with 1 Motor Driver

I am trying to control 4 DC Motors with a position feedback signal, with access to only one of manufacturer's motor control driver boards. Since I don't need simultaneous control over all of them, I ...
1
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1answer
251 views

What is the black thing on the circuit [duplicate]

What is the black thing on the below circuit? Is it used to hide the IC (or other components) that is used on the circuit? What material is it?
0
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1answer
60 views

IC chip for PCB to stabilize 12v input?

Hi I'm wondering if there's any SMD IC chip to stabilize a 12v input to a stabilized output? I need something like that to regulate power on PCB. Thank you.
2
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1answer
60 views

microcontroller bring-up

I'm in the process of assembling a microcontroller PCB design. It's essentially just a breakout board. I'm trying to think of the best way to test the board after assembly. My first thought is to ...
4
votes
2answers
211 views

PCB layout for high side switch (high current)

I'm working on a PCB layout for two high side switches. You can see below a picture of my current layout. The copper weight of the future PCB will probably be 2 oz/ft² (double sided). I use two ...
2
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2answers
312 views

PCB Design - dashed lines on layers

While taking a look at some other peoples PCB designs I noticed something that I haven't seen yet. In some designs, I see regions marked by unconnected, small dots on the signal layers. Here are two ...
1
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3answers
89 views

100W Soldering Iron Risks And Arduino

So I bought a 20W soldering iron a while ago and I found the experience very frustrating as the tip does not get hot enough quickly and when it does melt the solder it gets cold so quick I cant get ...
0
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3answers
80 views

Can this circuit board be repaired?

This is a board out of a Super Nintendo game cartridge. It appears to have damage from a few of the leads, and this game definitely doesn't work when tested. The game is very rare and worth my time ...
0
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1answer
74 views

Question about MCU's, and Audio Manipulation

Ok, so I've been doing some research trying to find something like an audio MCU\DSP with a built in audio filter; for instance, something that I could manipulate audio with to get a final filtered ...
3
votes
3answers
78 views

What is the easiest way to stagger a signal chain on a stack of identical boards?

I am designing a stack of identical boards that each generate an analog signal. What I am trying to do is take the signal from the board above, mix it with the signal from this board, and then send it ...
0
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4answers
126 views

How to order a custom PCB

I need a tiny PCB for a tiny IC. Is this something I have to design in autocad? Do I have to go to a shop to print it for me? Ultimately I want to be able to flux solder the IC on the tiny board so ...