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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6 views

Eagle 7.2.0 for Linux moveing imported bitmap without breaking bottom polygons

I have imported some logo into Eagle 7.2.0 for Linux PCB: Now, if I group select all polygons, rectangles, ... that build bitmap, I also "grab" other componentes, dimension, upper and lower layer, ...
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0answers
13 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, ...
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1answer
42 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
44 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
291 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 ...
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1answer
34 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
49 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
86 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, ...
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1answer
37 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. ...
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1answer
24 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 ...
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2answers
60 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 ...
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1answer
34 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 ...
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4answers
819 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 ...
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1answer
66 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
14 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 ...
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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 ...
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1answer
33 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 ...
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0answers
25 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. ...
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0answers
48 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 ...
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1answer
49 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 ...
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2answers
247 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 ...
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1answer
38 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 ...
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1answer
71 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: ...
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3answers
529 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 ...
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1answer
39 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 ...
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0answers
50 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 ...
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5answers
99 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 ...
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1answer
50 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 ...
2
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2answers
200 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
61 views

KiCad auto placer to compliment auto router

All, I have been designing few prototype PCB in KiCad and etching them using the Laser toner transfer method. This is working great as of now but as my circuit is getting complex, I am unable to place ...
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1answer
76 views

Should I build my own parts for making PCB with eagle or is there a database somewhere?

I'm trying to build a custom PCB for a project I'm working on. I'm building a small robot that navigates using a color sensor and moves using two motors. For logic I'm using an Arduino Nano. My ...
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1answer
52 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 ...
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4answers
89 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 ...
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1answer
40 views

Passive ringing on PCB causing noise

I have a PCB that is exposed to a sharp inductive-voltage collapse, around 100V/100nsec. The voltage collapse happens when the current through a transorb reaches zero. When this happens, the board and ...
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1answer
68 views

Schematic shows some resistor values as DNE

What does it mean on a schematic when some resistor values are listed as DNE?
2
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2answers
63 views

Muxes, Adders, Comparators, and Gates

This question is actually from one of my previous discussions, which I still don't understand how to implement. The goal is to use abstraction to design a circuit, which converts two-digit ASCII ...
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0answers
75 views

Single or dual ground plane for SMPS DC-DC converter?

I'm working on DC-DC converter prototype using dual layer PCB. Layout it finished using bottom layer as ground plane. Question is does make any sense to put on top layer also ground. How that can ...
2
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1answer
70 views

Floating plane in PCB

I just designed a simple class D amp pcb in which the ground plane is in a star configuration with the IC as center as suggested by the datasheet (cuts in signal areas vs big cap areas, etc..). VCC ...
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1answer
37 views

Connecting any signal route with unused pin

I am using BGA package type of MCU, and it has ball pins on the bottom side. As I route the signal route, some of pins should be connected with unused pins without build-up method. The pins are not ...
6
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1answer
686 views

Should I avoid BGA?

I am designing a board and have found that a BGA component is cheaper than the larger footprint. I am curious if I should be reluctant to implement a BGA with regard to extra steps during ...
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2answers
49 views

Milling power planes

I just started sketching a simple PCB for LEDs with integrated drivers, it has large unused spaces and being lightweight is important, so I was considering milling holes in the middle of these empty ...
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4answers
135 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 ...
3
votes
1answer
94 views

Crystal oscillator problem

Here is the datasheet of the crystal (32 MHz) that I use for a MCU. The right layout is an older version of my board which totally works fine. The left one is the newer version where I placed the ...
5
votes
3answers
593 views

How to deal with low space and high current?

In my circuit I am using a stepper motor driver, providing me up to 3 A current per trace. Thus I calculated the required trace width with a trace calculator, which told me to use a trace width of ...
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0answers
49 views

Cooling the IC on a board printed by hand

I'm building a battery charger circuit with BQ24278. The battery draws 500mA minimum and 2.5A maximum current; therefore, I must prevent IC from overheating. I printed the board onto single sided ...
3
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1answer
83 views

PCB Short Issue

I recently designed two boards and had them manufactured for a project I am working on. Before I soldered any components, I checked the continuity of some of my connections and discovered that there ...
0
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3answers
52 views

Connections for Panel Mount 12VDC Power Supply

I'm using a 12V Panel Mount Power Supply, taking a 110/220VAC input and giving a 12V/5V DC output. What is the best practice for connecting this power supply to the AC mains? And how should this ...
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0answers
31 views

sizing of trace of pcb? [duplicate]

Dose any one have example (picture) of real pcb board of various size traces .like 40th 60th....etc.actually i designed pcb on software as my term assignment .but i want to which width looks like how ...
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2answers
78 views

AVR Rapid Fire Mod… I hit a wall and need some help

Title says it; I'm making a rapid fire mod chip with the 328p family of chips right now (I'm going to scale down to whatever the smallest chip is that will safely hold the final software). I'm a fan ...
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1answer
36 views

Question about Audio signal trace layout (TLV320AIC3204)

I am using the TLV320AIC3204 in an audio project. The part is a stereo audio codec from TI. I'm curious about how the traces are to be laid out. With other chips such as the AD1939, you need to ...