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
83 views

I want to create a custom LED segment display. What do I need to study? [on hold]

I want to create and then order a small run of a customized mass-produced LED segment displays for an art project. They will use PWM. It is not much more complex or detailed than a 7 or 16-segment ...
6
votes
3answers
642 views

PCB cutout specification

I want to specify a square cutout in my PCB, to fit a sensor module. The cutout must be very tight, that is it should only be 100μm wider than the sensor on all sides, as it is used to hold the ...
0
votes
1answer
27 views

How do i make sure that PCB traces or Enclosure unit is not affecting the BLE 4.0 range?

I am using BLE 4.1 ready module having on chip antenna, according to datasheet i have taken care in PCB layout design that at least there should be 8 mm of distance from Antenna and copper traces from ...
6
votes
6answers
656 views

Designing a PCB layout without having a schematic diagram (or netlist)?

Could you please let me know if it's possible to design a PCB layout without a schematic diagram? I outsourced the development and manufacturing of the ARM board which has 512MB DDR3 RAM and 4GB ...
4
votes
4answers
223 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 ...
1
vote
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.
0
votes
1answer
88 views

Why are there unconnected exposed pads on PCBs [duplicate]

I've seen this in several designs. What purpose do these serve?
3
votes
2answers
39 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 ...
-1
votes
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 ...
1
vote
1answer
42 views

HM-11 Bluetooth Footprint

I'm using HM-11 Bluetooth module and is in layout process currently. One of the concern raised by my friend referring to the datasheet is whether the footprint lead dimension is the same in bottom ...
2
votes
1answer
69 views

Routing USB high-speed on two sided board

I found that it's always recommended to use at least 4 layers for high speed routing, but there are still some projects which uses only 2 layers for USB high speed. I'm just a hobbyist, I cannot ...
0
votes
2answers
66 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 ...
1
vote
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, ...
0
votes
0answers
12 views

Example Multilayer .cpm file for Cadence 16.6

I'm trying to learn Cadence PCB Editor Allegro GXL and Design Entry HDL 16.6. I searced for sample multilayer schematic and board files which are in same .cpm project, but i couldn't find. If you ...
0
votes
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 ...
0
votes
1answer
52 views

high speed differential nets crossing on PCB

I have 2 ICs working at 9 gbps. Output of 1 IC is differential CML pair and it goes as input to other IC. On PCB layout, if both ICs are placed on top (component) layer, one ICs positive pin is in ...
2
votes
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 ...
-2
votes
2answers
79 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, ...
5
votes
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 ...
1
vote
3answers
258 views

Eagle - Router does not understand wire jumpers?

I am using Eagle 7.2 - is there any setting which allows me to make Eagle understand wire jumpers? Neither the auto router nor the "show" button seems to be able to recognize that 2 wires connected by ...
3
votes
2answers
185 views

Choosing connectors for PCB

I am learning Fritzing, and looking to create my first pcb. The components are fairly simple: 10x DS18B20, 1x resistor, 1x Konekt Dash. I plan to have headers to connect the Dash so it can be easily ...
1
vote
1answer
72 views

Best way of jumpering high current traces on PCB?

I am designing a 4-layer PCB on which I have a trace that carries around 40A of current. The board will need to be tested at 125C. I need a way to physically disconnect this trace when needed. What's ...
3
votes
1answer
63 views

PCB fab and assembly, how to resolve width problem between adjacent pads?

I have just sent off for some pcbs to be fabricated and assembled, I have used this company before for fab but not assembly with no problems a few times. They have just sent back a issue I need to ...
0
votes
1answer
33 views

Using Pulse W3006 Dualband Wifi Antenna with a CPW-G Trace and Single RF_Out on MC

Pulse W3006 Chip Antenna Being Used We are designing a custom PCB which uses a micro-controller with a single RF-out capable of doing 2.4G/5G/Bluetooth. This questions has 3 parts: Using the Chip ...
0
votes
0answers
41 views

Several questions about OrCAD 16.6 (footprints + layout)

I'm finished with drawing a schematic, the next step would be to assign a footprint for each component. I have found the footprint library but I'm unable to view the footprints and would like to have ...
0
votes
1answer
56 views

How to find current limit or resistance of current path that is a polygon in PCB?

I'm trying to understand what is the relevant path of current when I use polygons for PCB design. Edit: I'm particularly interested in the current limit in that path without destroying it. Please ...
3
votes
2answers
69 views

How to stay well grounded?

After some read about ground plane breaks and inductor loops, now I am totally confused about how to design good PCBs. I made a small example of a two layer PCB. Blue is the big ground place. Red are ...
9
votes
4answers
680 views

How can I improve this Ethernet differential pair?

This is my first 100 Mbit/s Ethernet project (I am doing it to learn more about differential signals). I did two things that I don't know if are good or bad in this particular case. One is to route ...
0
votes
3answers
65 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
68 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
321 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
votes
1answer
48 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 ...
1
vote
4answers
380 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 ...
0
votes
0answers
17 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
136 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.
5
votes
1answer
95 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
41 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
vote
2answers
99 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
114 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
vote
3answers
50 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 ...
3
votes
3answers
120 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 ...
11
votes
4answers
517 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
28 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
46 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
votes
1answer
39 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
votes
1answer
65 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
180 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
224 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
votes
1answer
34 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?
0
votes
1answer
61 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 ...