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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3answers
54 views

Why do smd components in eagle have padding?

I'm new to eagle and I don't understand why there is a small padding to the left and right of some SMD components (for example the 0402 cap in the image). Having the physical board in my hand ... ...
1
vote
1answer
59 views

Designing a Smaller 2000W Transformer PCB to Run 220V Heating Element on 110V

I'm trying to design a step up transformer that can run my 220V heating element on 110V outlet. I've looked for such transformers through retail, but most of them are bulky and heavy. Is there a way ...
2
votes
2answers
299 views

Non plated through hole to PTH

I have defined Plated through holes on my PCB design.But somehow my pcb manufacturer has drilled it as non plated through hole and PCB has arrived.Now I need a suggestion to convert this non plated ...
0
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1answer
46 views

programing a timer [closed]

I am working on a hydroponic project that needs some programmable micro controller or something. Here is the deal. I am a mechanical engineer and my knowledge on electronics is pretty limited so here ...
0
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0answers
35 views

Altium .PcbDoc document corrupt generation [closed]

I´ve installed Altium, but when generating the .PcbDoc document the environment keeps the same as at schematics, and can't work on it. I have reinstalled Altium many times, but it keeps happening ...
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3answers
363 views

howto align mount holes in 2 pcb the right way?

I'm tring to make some sort of shield board (it's not an arduino): first board was made in orcad, I have source files gerbers and so on... I'm making a 2nd board in eagle. When trying to align the ...
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0answers
13 views

How to import a hatch form AutoCAD to Altium Designer?

I have a hatch in AutoCAD 2015 in a separate layer. How can I import it into Altium Designer Platform Build 26245 to have a polygon pour? I mean to turn a hatch in AutoCAD into a polygon pour in ...
1
vote
1answer
123 views

How to create a circular polygon pour cutout in Altium Designer?

It is possible to choose "polygon pour cutout" from place menu and create one by clicking multiple points. but how can I create a circular one? I am using Platform Build 26245.
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1answer
56 views

Blocking Capactiors in PCB [closed]

Why blocking capacitors are placed near transmitters in PCB? Is there a constraint tied to it due to Signal Integrity in layout of PCB.
5
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1answer
80 views

Possible wrong use of TVS diodes?

I've been facing a weird situation and unable to find the reason behind so far, therefore I frustratedly turned up for help. I have a system comprised of 2 separated PCBs (A control box and an ...
0
votes
1answer
37 views

What is the best method to determine bypass capacitors for each chip in Mixed-Signal Systems? [closed]

In datasheets of chips, usually they have reference designs and to those designs bypass capacitors are predetermined. But, when I examine some high level designs of those chips I see different bypass ...
1
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2answers
85 views

GND in a DC circuit with circuit board

I wonder a question. Let's say I use a circuit board in a project (the left hand side on image below, not the Verabod), and I want to solder a circuit on it. For example, I want to use the circuit ...
-4
votes
2answers
110 views

Where can I find education on motherboard design? [closed]

So, in the recent past, i started a project that required the research of the design process of a motherboard. This sparked my interest in the topic, but i'm having trouble finding a good education ...
1
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3answers
49 views

how to get a breakout made for module that doesn't have one?

I'm just starting out in this field and I got ideas for projects I want to build but I'm running into problems, not so much with how to find the part I want or how to get it to work. but how to ...
2
votes
3answers
91 views

CAN bus layout design

I am trying to design a CAN bus node. The CAN bus shall be split-terminated with 120Ohm, 60Ohm for each line. Therefore i tried using this paper to calculate a characteristic impedance of 60Ohm for a ...
10
votes
4answers
468 views

PCB Trace Layout to Minimize Inductance

I was wondering what the intuition was behind widening PCB traces to minimize the inductance between a trace and its ground plane. Many high speed design guides cite this without providing much of an ...
1
vote
1answer
20 views

Create breakout for iM880A-L

I currently need to work with the iM880A-L. As it is annoying and shaky to solder that thing on perfboard and attach cables, I want to create a breakout board with JTAG and SWD plug and pins for all ...
1
vote
1answer
45 views

What are the capacitor values and why there are holes in PCB? - Semtech's reference design - SX1272MB1DCS

Semtech is providing a reference design concerning the SX1272 chip: SX1272 modules: SX1272MB1DCS - 868 MHz - Combined RFI and RFO, switchless (Ref design only) I can't find the values of C12, C14, ...
0
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1answer
36 views

Best way to prototype a TDFN package chip (MAX9814 and MAX9820)?

For my engineering project, we wanted to use the gain control and amplifier available on these two chips, but are finding difficulty with prototyping them as they are so tiny. One of the chips is a 14 ...
0
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1answer
58 views

“Chamfered” Routing in Eagle

I need to create the following trace in Eagle but I can't work out how to make it go from one width to another across a set distance like below.
6
votes
1answer
163 views

SMD footprint design: Heavy copper, pad width smaller than pin width?

I'm working on a high power board that's using heavier (4oz) copper. I have an IC on this board in a 0.8mm pitch QFP-32 package (no other package options available). The IC's datasheet says the pin ...
5
votes
1answer
202 views

PCB trace clearance in 220V circuit

This is a pcb layout where I am converting 220V rms to a DC voltage (for microcontroller). The pcb has severe size constraints. This is one design I could come up with: Circuit explanation: ...
0
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1answer
33 views

How to to design a PCB lib for components with variable dimensions?

I'm designing various PCB libraries for components. But sometimes they have variable dimensions: How should I design the pads for components with fluctuating values?
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3answers
73 views

Pic microcontroller relay switching of 1 HP single phase motor [closed]

The situation is I am using pic microcontroller for power supply I am using 230 to 12 v stepdown transformer + 1000 uf 25 v capacitor + lm7805 + 10 uf 25 v capacitor from and these two positive and ...
0
votes
1answer
55 views

pcb design: how to route through hole connectors with tightly fitted pins?

I'm new to all of this but I'm trying to make a breakout board to a 51 pin micro-d connector. There's a lot of pins like so: The breakout board is used too check continuity so no current actually ...
0
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2answers
43 views

Which layer contains the board outline in PADS Layout?

TL:DR If I create or import a board outline on PADS Layout, in which layer(s) is it drawn? Can I make it visible/invisible? On Mentor Graphics PADS, I'm trying to import a board outline from a ...
0
votes
1answer
83 views

Chess-Board schematic/pcb layout

Hey guys as described here I also want to make a chess board with some arduino support. Here I want to ask some questions regarding the schematic and the pcb layout I am planing to do. @Dmitry ...
0
votes
1answer
68 views

Design for Multiple I2C slave devices

I'm doing a PCB in which I'm using the Beagle Bone Black to interact with multiple I2C devices. I have attached a schematic. Out of the many I2C devices, I'm connecting some using TI's I2C switch ...
-1
votes
1answer
71 views

multiple power supplies (5V, -12V, +12V) all on same board [closed]

I'm finishing up a pcb design and my specs just changed and I need to power an external sensor with +/-12V. I previously had only been concerned with the voltages >0 but now I have to supply voltages ...
0
votes
2answers
59 views

PCB trace width question

I am in doubt about how to route the relay in below situation. The thick lines(3mm) on the left are Normally Closed, Normally Open pins of the relay, and the third line(2mm but top and bottom) is ...
1
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0answers
91 views

Capacitors near MCU VCC pins

I am planing my first MCU board and this MCU has several pins that need VCC (3.3V). My friend suggested that I put capacitors 0.1uF near every VCC pin to remove disturbances. But if these pins are ...
6
votes
4answers
138 views

What are good quality of life additions to a prototype PCB?

What additions are good to add to a prototype PCB that makes your life easier? I have come across a few nice additions such as: Adding useful information on the silkscreen to designate functional ...
3
votes
1answer
71 views

Is using vias for split data buses a bad idea?

I've tried searching for this but can't seem to find the answer I'm looking for. I'm designing my first PCB and I'm having trouble routing data lines without making the board large. For example, I ...
0
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0answers
48 views

Copper Pour on Signal Layer on PCB

I am designing a 4 layered PCB for the first time. I am using Top and Bottom Layer for Signals, and inner1 layer for Ground, and inner2 layer for VCC. Layer arrangement will be as following, TOP ...
0
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1answer
54 views

Altium Generic components

I am new to Altium designer and had a question. For all of their generic component libraries from the Altium vault they only have 0603(1608 Metric), 0805(2012 Metric) etc. From looking at ...
9
votes
2answers
1k views

Best way to connect 2 pins that are next to each other?

The two pins are next to each other and they must be connect together. How should I do that? Just connect them together with a simple trace? Or pour them together?
3
votes
3answers
387 views

Questions about automotive electronics PCB layout

I am a student of vehicle engineering and I love automotive electronics very much. Right now, I have an ESP sensor cluster to study, and I am lucky to have a look at the PCB inside. I have some ...
1
vote
2answers
49 views

Annular ring on pad

I understand that it's bad practice to put a via on a pad as it can wick solder during reflow. How about putting the via directly adjacent so the ring is touching the pad but the hole is outside? ...
1
vote
1answer
54 views

How to create a complex board outline for KiCad?

I would like to create a board border featuring more complex arcs, constrained shapes, etc. for use in KiCad (and compatible tools like Topor). The internal tools are much worse than what other ...
0
votes
1answer
57 views

altium designer - Could not find port 'PA0' on model 'tm4c1294_01' for pin 'PA0'

I am designing my very first PCB. I need a PCB with a cortex M4 core in a qtf package. I tried to follow this tutorial: ...
0
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0answers
36 views

gEDA pcb: footprints for push buttons

I am moving from eagle to gEDA. I learned that there is a bunch of footprint for common components such as connectors and dual inline package chips. But I can't find what is the footprint for push ...
0
votes
1answer
32 views

Upper and lower dimmensions in schematics [duplicate]

What is the difference between upper and lower dimmensions in schematics? So far I have assumed that those are simply maximum and minimum values specified by the tolerance. Is my assumption correct? ...
3
votes
1answer
65 views

PCB Design Ruleset

I have just started learning PCB Design (using Altium Designner) and I have a basic question about PCB Rule set. Rule set is defined by the Altium, but can we edit the rule set according to our ...
0
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0answers
41 views

Making my Atmega128 board AVR headers

I have been working on this project for days. Finally got the framework, ie, the header for this 64 pins MCU up. I have few questions, or rather doubts before finishing it up. Being new to this IC, ...
1
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0answers
44 views

Understanding the package drawing of a qfp

I am designing my very first PCB and there are a few things on the package drawing of my microcontroller that are unclear to me. Why are the sizes expressed in fractions? e.g.: 0,23/0,13 or ...
4
votes
2answers
93 views

What are reasons for NOT connecting exposed pad (EP/thermal pad) to ground?

For what reasons would a manufacturer suggest that the thermal pad should NOT be connected to ground? See link and snippet from a Nordic datasheet. ...
2
votes
2answers
65 views

How to avoid interferences (antenna effect) in long traces in PCB?

I am working on a PCB layout in which I have a 40cm long traces (bus of 4 traces). This traces will support between 50mA to 100mA and 5V. I want to minimize possible antenna effects that may occur due ...
1
vote
1answer
63 views

Does a Ground plane in Eagle still need connections?

Before I added a ground plane my ratsnest was showing the needed GND connections which I still needed to make. I added a Ground plane and now they are automatically gone. Is this normal? I can ...
0
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0answers
29 views

Remove GND lines from EAGLE's ratsnest [duplicate]

I was wondering whether or not its possible to remove the GND net lines from the ratsnest in EAGLE. It is showing me a whole bunch of routing that has to be done for the GND but since I'm working ...
4
votes
1answer
102 views

Getting started with Qualcomm reference designs

I am looking to get started with Qualcomm Reference Designs. I am partly inspired by this article: "Start Your Own Smartphone Company for $1,000". I have an application that I would like to be able ...