About designing the boards which carry the components of an electronic circuit. For questions about getting them built instead use PCB-fabrication. If your question is specific to a certain CAD tool, say which tool and version you are using.

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1answer
47 views

Grounding a pcb

What are the most important rules for grounding in a pcb? Can anyone explain with reasons? We are making a pcb for electrical power systems in our project. It has high switching converters and some ...
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1answer
35 views

switch mode power supply

I want make a switch mode power supply but I don't know how to design its circuit diagram. I know the general theory behind an SMPS system and its components but I don't have enough knowledge about ...
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0answers
43 views

With regard to proper EMC design, what does the term Incomplete Inductance mean and what is it's significance?

I presume it has to do with incomplete loops or loop inductance. Do I want to avoid Incomplete Inductance? If so, what are some best practices? EDIT Here's a link to an upcoming EMC seminar brochure ...
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2answers
54 views

Eagle PCB design issue

I have finished the schematic layout for my design which contains transformer. I also found the optimized design 100%, but the transformer background should be black while I'm having only portion of ...
4
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2answers
54 views

Creating an Integrated Circuit Component in Altium

I am new to PCB designing and I am new to Altium. I want to make a schematic, PCB design and simulate a RF circuit involving a GPS receiver front end IC MAX2769. Altium library does not have this IC. ...
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5answers
1k views

Anything bad to place a via on a pad?

Once I mistakenly placed a via on 0603 pad and didn't have any problem on soldering. I am routing another board now and I could save some space by placing some vias (0.3mm) on a 0603 pad. I wonder if ...
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3answers
89 views

Using a mixed technology, SMD and THT components in one PCB

I want change design from Through-hole technology to SMD design. Some components have no SMD version, for example some transistors in TO-92 package, and Power Mosfets, which available in DPAK SMD ...
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0answers
28 views

Power MOSFET 27N3LH5 for SMT design

I want change existing through-hole type PCB design to SMT design. The existing design use Power MOSFET 27N3LH5 in TO-220(DIP) package and with Heat Sinks in output channels. The SMD version of ...
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2answers
36 views

Eagle Board Editor: Garbage or stray marks of a particular component stays back even after moving it

I am designing a primitive PCB design in Eagle. I used many tools like move, route, delete, smash, etc. I dont know why I bumped into this problem. When i move a component ,there is a part of the ...
0
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1answer
30 views

Power switchers copper fill / region

When is it considered that too much is too much when it comes to copper fills on DC-DC switchers. I am currently laying out a Buck, 3 Amp max output. Every literature that I have scanned before ...
2
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1answer
42 views

review of ceramic resonator layout for atmega ciruit

I have a custom build of an arduino mega (i.e. I took the reference design, and modified it to fit my specific requirements). As a result, the layout is substantially different from the reference ...
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0answers
21 views

What skin depth percentage will require the use of a via to connect top and bottom side of a plane?

This question arose from the comments of the the following question : Physically, what is and how to, make an anti pad? If we have a plane with adjacent signal layers to the plane (similar to the ...
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1answer
37 views

Altium Connections

In Altium, does a multilayer Pad with the same net as a plane (internal ground plane in this case) automatically connect to that plane, or is a separate via required?
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1answer
60 views

Sharing ground and power across circuits

I'm just beginning with circuits, so pardon if this is elementary, but I couldn't figure it out. I'm building a speaker joining several circuit boards together: a trinket pro a class d amp an FM ...
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2answers
82 views

Physically, what is and how to, make an anti pad?

Consider the following later stack (it's only the top 3 layers of an 8 layer board) Top Signal Layer Plane Signal Layer I have a high frequency trace that is being routed on the top layer and I ...
0
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1answer
44 views

dimensions error

I have to admit that I am quite new to eagle and that I am about to create my very first PCB. However, I ran into an error I do not understand. I do use 10x1 pinheads from the pinhead library, but ...
1
vote
2answers
104 views

How much effort goes into designing and laying out a PC motherboard? [closed]

How much effort goes into designing and laying out a PC motherboard? By this, I do not include Intel's IP etc, but I do including having to read all the documentation concerning the chipsets. And ...
2
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3answers
150 views

'Unrouting' a ground plane on Eagle

I have been using Eagle for quite a while now but there is one thing that continues to bother me while I am using it. I have made the ground plane cover the shape of the board, however, when I am ...
3
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2answers
49 views

Restrict area trouble in Eagle

I am trying to get a small section of my PCB design to be ground-free as this is the advised layout given by the manufacturer of the component. However, I believe that because there are components ...
0
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1answer
20 views

How to recalculate connections/airwires from copied traces?

I am learning how to use Eagle, and am designing a breakout board. After routing the connections for the top of the IC, I duplicated and mirrored them for the bottom connections. How do I make Eagle ...
3
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1answer
63 views

Multiple SPI Busses in Ribbon Cable

I have a multiple SPI busses running through a ribbon cable which is 15cm long. What is the best CS, SCK, MOSI, MISO orientation to avoid the cross talk between each wire and is it enough to use ...
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4answers
130 views

Minimizing PCB size of a 192 RGB LED array

I'm working on the design of an LED lamp house for my film scanner. I need RGB LEDs, plus IR LEDs. I'm figuring on a 2"x2" grid of SMD LEDs. Datasheets for the ones I'm using below. The current design ...
0
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1answer
50 views

KiCad Multiple power inputs

I'm working on a project in KiCad. I have a connector that has multiple connections for GND, +5V, and +12V (all set to type: Power Output) in order to increase the maximum current. However, I don't ...
16
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6answers
2k views

New to PCB design - why doesn't auto placing components exist?

The circuit design software I have seen has the ability to automatically route traces etc. on a PCB. But why doesn't this software have the ability to automatically place components on a PCB say to ...
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0answers
25 views

Cannot place component in a column using Eagle 7.2.0 for Linux

In Eagle 7.2.0 for Linux I have 7 identical relays in schematic:Now, why can I while drawing PCB align into column relays K2-K7, ...
0
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1answer
45 views

what does this symboles means Unm, Uni?

I found in some documents that the creepage and the clearance distance for PCB are calculated according to the value of the tensions Unm and Uni. What does this symboles means ?
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2answers
58 views

Design Considerations for Raspberry Pi Expansion Boards

I am venturing into the space of designing expansion boards for Raspberry Pi's. I have done this for Arduino boards but RPi's are a different beast. From personal experience I have already had ...
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2answers
314 views

Designing a high-power PCB

I'm trying to build a Raspberry Pi cluster (at least 32 Pi's) and I need a convenient way to power them all. So I'd like to design a power distribution board. The distribution board will have USB ...
0
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1answer
51 views

Connecting to a split plane in Altium

I am using Altium 14.0.9. I have a split plane on my inner layer of a 4 layer PCB. This split plane is connected to the net C6_2. It is basically 2 polygons on my ...
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1answer
62 views

Placing Ground Vias To Improve EMI

Placing ground vias all over the PCB (stiching) to improve the EMI. Have all ground vias to be spaced the same distance? Or may they be separated different distances if it is under lambda/8? I ...
3
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1answer
111 views

Micro controller reset due to noise, PCB design for noise immunity

After making this PCB, I learnt the importance of ground plane. Besides ground plane, there is considerable amount of theory behind PCB designing which can provide immunity against ESD, surge, EMI, ...
2
votes
1answer
47 views

Grounding two boards connected to a backplane

I have a design which consists of a backplane and two boards mounted to this through some headers. The backplane provides a common 5V and ground to both boards and it also has a solid ground plane. ...
0
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1answer
37 views

Placing a QFP 52 footprint on the PCB in KiCAD

I'm new to PCB design and want to make an adapter board from an SMD QFP52 package to DIP. Apparently QFP52 is not very common so I cannot find it in the library. There appears to be no pre-existing ...
0
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2answers
75 views

How should I connect / design this tactile push button on PCB & schematic?

I have need for a tactile push button that I am using to cause an interrupt on a microcontroller. I have found my desired switch (linked above) but I am having trouble deciding the best way to design ...
0
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1answer
44 views

How to determine BGA land pad diameter for given ball diameter?

I'm working on a project which requires the use of a CSP package. The product's datasheet provides ball pitch in each axis as X:710um Y:580um and ball diameter as 250um but nothing about the preferred ...
13
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4answers
889 views

Arduino resetting/hanging due to sparks in ac line

This is the PCB design of the project I have been working on recently (my first pcb design). The idea is to control ac appliances (fans, bulbs etc) without relays. I am using triacs which are ...
0
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1answer
78 views

Trace vs Plane on Multi-Layer Board

Designing a 4-layer board (signal+pwr, gnd, signal+pwr, gnd), and I have some newbie doubts about the best option to connect different connector's pin or IC's pad to power lines, or sometimes to ...
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0answers
25 views

solution of “some nets were not able to be matched” in altium designer

There are two schematics in this project with name Current source R01 and Relay circuit. When I go to Design toolbar and select Update PCB document, Error message appear which is shown below: "some ...
0
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1answer
37 views

What happen if I switch those labels when generating Artwork

What will happen if I edit the label "TOP" and write is as "BOTTOM" and vice versa with the other one? Will the manufactured board be ok, or will everything be mirrored? (When BOTTOM layer is mirrored ...
0
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1answer
45 views

Can't move objects with Altium

I'm designing a PCB with Altium 14 composed by 4 SMT headers (2 on top, rest on bottom) but everytime I try to move them it puts the cursor on coordinates -4699.664,49086.331 (way, way far from my ...
0
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0answers
27 views

LPRF design on 4 layers

Developing a new design on a 4-layer stack with reduced dimensions, there are some doubts I expect you can help me with. The board includes RF part, MCU, voltage regulator & battery charger. ...
0
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0answers
70 views

Via definition & routing on OrCAD - PCB Editor

there are some doubts I need to solve before adding vias to the layout. Two types of vias are needed, through hole and BBvias, could the drill hole be the same for both of them? -- Via Pad <= 0.3 ...
0
votes
1answer
55 views

How would one connect multiple PCB's together for compact designs? [closed]

I was recently looking at the site hello.is/technology as I was interested on how they fit so much in such a small package. So I was wondering what options their where to connecting Multiple PCB's ...
5
votes
2answers
319 views

Trace Length Tolerance Calculation - High Speed PCB Design

I have to interface a video format converter with a ADC IC, which converters RGB analog data to digital. The connection between this ADC and Converter is a 20 bit data bus which clocks at about ...
1
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1answer
39 views

How to setup PCB to correct for signal integrity issues after boards are made?

I have a board layed like the in the image below. I have a microcontroller that generated clk1, which feeds into U1. After 8 clock cycles, the clock passes through to U2 and does this 30 times. It's a ...
2
votes
1answer
92 views

CADSOFT EAGLE libraries searching best practices

I just started to learn how to use EAGLE PCB software. The device I wanted to draw as the first try containing two elements that are not in the libraries provided with Eagle out of the shelf: ...
14
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3answers
579 views

Why do they make traces to LTZ1000 in spiral shape?

I was browsing Google images of LTZ1000 voltage reference IC. I saw that in some of the PCBs, the traces that go to LTZ1000 are in spiral shape and cut out gaps are left between them. What is the ...
0
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1answer
45 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 ...
0
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0answers
51 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 ...
2
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5answers
116 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 ...